Engine Power Reduced - DIYCarExpert

Chevy Impala engine power reduced warnings can be frustrating and concerning for owners. This comprehensive guide explains why this message appears, how to diagnose the problem, and provides practical solutions to get your Impala running properly again. Why Does My Chevy Impala Say "Engine Power Is Reduced"? When your Impala displays "Engine Power Is Reduced," the vehicle's computer has detected a potential problem and deliberately limited engine performance to prevent damage. This protective "limp mode" restricts acceleration and top speed until the issue is resolved. When this warning appears, your Impala's powertrain control module (PCM) has identified a condition that could damage critical components. The system responds by limiting throttle response, reducing available power, and possibly restricting transmission function. You'll notice significantly decreased acceleration, with top speeds potentially limited to 35-45 mph. This allows you to reach a service facility without risking further damage. The warning appears on your driver information center as "Engine Power Is Reduced" or "Reduced Engine Power." This is often accompanied by a check engine light and possibly other warning indicators. Is It Safe to Drive My Chevy Impala When Engine Power Is Reduced? You can drive your Impala short distances with reduced power if absolutely necessary, but only to reach a repair facility. The safety risk increases significantly with speed, distance, and driving conditions, making immediate professional diagnosis the safest approach. Driving ConditionSafety LevelRecommendationShort distance on city streetsModerate riskDrive cautiously to nearest repair shopHighway/freeway travelHigh riskAvoid - inadequate acceleration creates hazardsHeavy trafficHigh riskAvoid - unpredictable acceleration increases collision riskWet or icy conditionsExtreme riskDo not drive - reduced control significantly increases accident riskUphill terrainHigh riskAvoid - vehicle may lack power to climb effectivelyWith multiple warning lightsExtreme riskDo not drive - tow to repair facility Top 8 Causes of "Engine Power Is Reduced" in Chevy Impala The most common causes of engine power reduced Chevy Impala warnings include throttle body failures, sensor malfunctions, wiring issues, battery/charging system faults, transmission problems, electronic control module glitches, and fuel system issues specific to this model. #1) Throttle Body Failures in Chevy Impala Throttle body issues are the most common cause of reduced engine power Chevy Impala warnings. This critical component controls airflow into the engine and frequently develops problems including: Carbon buildup restricting throttle plate movement Failed throttle position sensors within the assembly Damaged electrical connections to the throttle body Motor actuator failures preventing proper throttle response Internal corrosion affecting electronic components The 2006-2013 Impala models are particularly prone to throttle body issues, with carbon buildup being the most frequent culprit. #2) Accelerator Pedal Position Sensor Problems The accelerator pedal position sensor tells your Impala's computer how far you're pressing the gas pedal. When it fails, the computer receives incorrect or no information about driver input. Symptoms include delayed throttle response, erratic acceleration, or complete non-response to pedal input. The Impala uses redundant sensors for safety, and disagreement between them triggers reduced power mode. Testing requires measuring voltage outputs at different pedal positions using a multimeter or diagnostic scanner. Replacement typically involves the entire pedal assembly rather than just the sensor. #3) Mass Air Flow Sensor Failures in Impala The mass air flow (MAF) sensor measures incoming air volume and density, critical for proper fuel mixture calculations. When dirty or failing, it sends incorrect readings to the engine computer. In Impala models, MAF sensor issues often cause hesitation during acceleration, rough idling, and stalling. The sensor can become contaminated with dirt, oil particles, or moisture over time. Cleaning the sensor with specialized MAF cleaner sometimes resolves the issue, but replacement is often necessary for proper function. This sensor is typically located in the air intake tube between the air filter box and throttle body. #4) Wiring Harness Issues in Chevy Impala Wiring issues are a common but often overlooked cause of Impala engine power reduced warnings. The Impala has several known wiring vulnerability points: The throttle body wiring harness can develop shorts or breaks, especially near connection points. Wires between the accelerator pedal and PCM may chafe against underdash components. The transmission wiring harness can develop issues where it passes near hot exhaust components. Corroded ground connections, particularly those under the battery tray, can cause erratic electrical behavior. Diagnosing wiring problems requires careful visual inspection and continuity testing with a multimeter. #5) Battery and Charging System Problems Electrical system issues frequently cause engine power is reduced Impala warnings. Modern vehicles require stable voltage for proper sensor operation. A weak battery or failing alternator can cause voltage fluctuations that confuse sensors and control modules. The Impala's electronic throttle control is particularly sensitive to voltage issues. Battery terminals with even light corrosion can create resistance that affects system voltage. Testing requires checking battery voltage (should be 12.6V when off, 13.7-14.7V when running) and inspecting charging system components. #6) Transmission Communication Errors Transmission problems commonly trigger Chevrolet Impala engine power reduced warnings because the transmission control module communicates constantly with the engine computer. Issues include: Slipping gears that cause unexpected RPM changes, triggering protective measures. Low or contaminated transmission fluid affecting hydraulic pressure and solenoid function. Failed shift solenoids preventing proper gear engagement. Damaged wiring between the transmission and engine control modules. The vehicle reduces engine power to prevent damage when it detects abnormal transmission operation, especially in models with the 4T65E and 6T70 transmissions common in Impala models. #7) Electronic Control Module Faults The engine control module (ECM) or powertrain control module (PCM) is your Impala's primary computer. Software issues can trigger engine reduced power Chevy Impala warnings even when no physical component has failed. Some Impala model years have known software calibration issues that GM has addressed through updates. Outdated software may misinterpret normal sensor readings as fault conditions. In some cases, the module itself may be faulty, with internal electrical problems or water damage. Diagnosis typically requires dealer-level equipment to test the module's inputs and outputs. #8) Fuel System Problems Causing Reduced Power Fuel delivery issues can trigger reduced engine power Impala warnings when the engine isn't receiving adequate fuel. Common problems include: Clogged fuel filters restricting flow to the engine. Failing fuel pumps unable to maintain proper pressure. Contaminated fuel injectors causing uneven spray patterns. Fuel pressure regulator issues resulting in inconsistent fuel delivery. These problems typically manifest as hesitation, rough running, or stalling before triggering the reduced power warning. How to Fix Chevy Impala Engine Power Is Reduced Warning Many engine power is reduced Chevy Impala issues can be diagnosed and fixed by owners with basic mechanical skills and tools. Following a systematic approach can save hundreds in repair costs while resolving the problem effectively. Step 1: Retrieve Error Codes from Your Impala Purchase or borrow an OBD-II scanner compatible with GM vehicles Locate the diagnostic port under the dashboard on the driver's side Connect the scanner with the ignition on but engine off Follow scanner instructions to retrieve and record all error codes Look for specific codes like P2135 (throttle position correlation), P0121-P0124 (throttle position sensor issues), or P0101 (MAF sensor range/performance) Research these codes for Impala-specific information Step 2: Inspect and Clean the Throttle Body Disconnect the negative battery terminal for safety Locate the throttle body on the engine (between air intake and intake manifold) Remove the air intake duct to access the throttle body Take a photo of electrical connections before disconnecting them Remove the throttle body mounting bolts (typically 10mm) Clean the throttle plate and housing with throttle body cleaner Do not manually move the throttle plate as this can damage the motor Reinstall in reverse order and reconnect the battery Perform the throttle body relearn procedure Step 3: Test and Replace Faulty Sensors For testing the accelerator pedal position sensor, use a multimeter to check resistance and voltage values at the connector. Reference values should be in your service manual. When checking the MAF sensor, inspect for contamination and clean with MAF-specific cleaner. Test voltage output (typically 0.5-4.5V) as engine RPM increases. For oxygen sensors, check response time and voltage fluctuation (should cycle between 0.1-0.9V) using a scanner with live data capability. Slow response indicates a failing sensor. Replace sensors that fail testing with OEM or high-quality aftermarket parts. Avoid the cheapest options as they often fail prematurely. Step 4: Check Battery and Charging System Start by inspecting battery terminals for corrosion and ensuring tight connections. Clean terminals with a wire brush and baking soda solution if corrosion is present. Test battery voltage with a multimeter - should read 12.6V when off, 13.7-14.7V when running. Lower running voltage indicates alternator problems. Check for parasitic draw that might be draining the battery when the vehicle is off. Normal draw should be under 50 milliamps. Consider replacing batteries older than 3-4 years, especially if you live in extreme climates. Impala electrical systems are sensitive to battery condition. Step 5: Reset the Engine Power Reduced Message After fixing the underlying issue, you can reset the Impala reduced engine power warning by: Disconnecting the negative battery terminal for 15-30 minutes, then reconnecting. This forces a system reset but will also reset radio presets and other settings. Using an OBD-II scanner to clear codes after repairs. This is the preferred method as it doesn't affect other vehicle settings. Performing the specific throttle body relearn procedure: Turn key to ON position without starting engine, wait 3 minutes, turn key off for 1 minute, then start engine. Drive the vehicle through a complete warm-up cycle to allow all monitors to reset and confirm the fix was successful. Chevy Impala Reduced Engine Power by Year Chevy ImpalaModel Years1st Generation19582nd Generation1959, 19603rd Generation1961, 1962, 1963, 19644th Generation1965, 1966, 1967, 1968, 1969, 19705th Generation1971, 1972, 1973, 1974, 1975, 19766th Generation1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985Production Gap1986, 1987, 1988, 1989, 1990, 1991, 1992, 19937th Generation1994, 1995, 1996Production Gap1997, 1998, 19998th Generation2000, 2001, 2002, 2003, 2004, 20059th Generation2006, 2007, 2008, 2009, 2010, 2011, 2012, 201310th Generation2014, 2015, 2016, 2017, 2018, 2019, 2020 2008 Impala Reduced Engine Power: Common Causes and Fixes The 2008 Impala reduced engine power issues are predominantly related to throttle body failures and accelerator pedal position sensor problems. This model year has a particularly high rate of these failures compared to other generations. Why 2008 Impala Models Experience Loss of Power The 2008 Impala uses an electronic throttle control system that's particularly prone to failure. The throttle body design in this model year tends to accumulate carbon deposits more rapidly than later versions. The 2008 Impala loss of power issues often stem from the vehicle's sensitive throttle position correlation monitoring. Even minor discrepancies between sensor readings can trigger limp mode. Wiring harness routing in the 2008 model creates vulnerability points where chafing can occur, particularly near the throttle body and accelerator pedal connections. Most Effective Fixes for 2008 Impala Power Issues Based on owner reports, the most effective fix for 2008 Impala power issues is replacing the accelerator pedal assembly. This relatively inexpensive part ($150-250) has resolved many persistent problems. Throttle body replacement is another common solution, though thorough cleaning sometimes works for less severe cases. Always perform the throttle body relearn procedure after cleaning or replacement. Checking and repairing ground connections, particularly those near the battery and engine, has resolved intermittent power reduction issues in many 2008 Impalas. Throttle Body Problems Specific to 2008 Impalas The 2008 Impala throttle body is particularly prone to carbon buildup that interferes with proper plate movement. The throttle position sensors in this model year are more sensitive to contamination than later designs. The throttle actuator motor in 2008 models can fail prematurely, preventing proper throttle response. This often requires complete throttle body replacement rather than just cleaning. Electrical connectors on the 2008 throttle body are vulnerable to corrosion and heat damage. Inspecting and cleaning these connections sometimes resolves intermittent issues. 2010 Impala Reduced Engine Power Problems Solved The 2010 Impala reduced engine power issues share similarities with other model years but have some unique characteristics. Understanding these specific problems helps target effective repairs. Known Issues with 2010 Impala Power Management The 2010 Impala commonly experiences throttle body sensor correlation errors (P2135) that trigger reduced power warnings. This model year also has known issues with the accelerator pedal position sensor assembly. Wiring problems are more prevalent in the 2010 model, particularly with the 5-volt reference circuit that supplies multiple sensors. A single wiring issue can affect multiple systems simultaneously. The 2010 Impala's PCM calibration is sometimes too sensitive to minor sensor variations, triggering unnecessary power reduction. Software updates are available to address some of these issues. Technical Service Bulletins for 2010 Impala GM issued TSB #10-06-04-006C addressing throttle body cleaning and replacement procedures for 2010 Impalas experiencing reduced power warnings. This bulletin specifically mentions carbon buildup as a primary cause. TSB #09-06-04-026 covers accelerator pedal position sensor diagnosis and replacement for intermittent reduced power conditions. This bulletin applies specifically to 2010 Impala models. TSB #10-07-30-002 addresses potential wiring harness issues that can cause multiple sensor codes and reduced power warnings in 2010 Impalas. Successful Repairs for 2010 Impala Power Problems Many 2010 Impala owners report success with complete throttle body replacement rather than cleaning. The redesigned replacement parts often resolve issues permanently. Replacing the entire accelerator pedal assembly has been effective for many 2010 Impala owners experiencing intermittent power reduction. This addresses both the mechanical and electronic components in one repair. Some owners have resolved persistent issues by having the PCM reprogrammed with updated software. This is typically performed at dealerships with specialized equipment. How to Reset Engine Power Is Reduced Warning in Chevy Impala To reset the engine power reduced Impala warning, you can use the battery disconnect method, an OBD-II scanner, or perform a throttle body relearn procedure. These methods clear the error codes but won't fix underlying issues. Battery Disconnect Method for Impala Ensure your Impala is completely off with key removed Disconnect the negative (black) battery terminal using the appropriate wrench Press and hold the brake pedal for 30 seconds to drain residual power Wait 15-20 minutes with the battery disconnected Reconnect the battery terminal, ensuring a tight connection Start the vehicle and check if the warning has cleared Test drive to see if the warning returns Using an OBD-II Scanner on Impala Connect an OBD-II scanner to the diagnostic port located under the dashboard on the driver's side. Turn the ignition to the "on" position without starting the engine. Navigate to the "Read Codes" function to identify specific trouble codes. Record these codes for reference before clearing them. Select the "Clear Codes" or "Erase Codes" function to reset the warning lights. Some scanners may require you to select specific systems (engine, transmission, etc.) to clear. After clearing codes, cycle the ignition off and on before restarting the engine. This completes the reset process. Throttle Body Relearn Procedure for Impala After cleaning or replacing the throttle body, a relearn procedure is necessary for proper operation. Start with the engine completely cold and off. Turn the ignition key to the "on" position without starting the engine. Wait exactly 3 minutes to allow system initialization. Turn the ignition off for at least 1 minute. Start the engine and allow it to idle for 3 minutes without touching the accelerator pedal. Turn the engine off for 1 minute, then restart. The throttle body should now be recalibrated for proper operation. Why Simple Resets Sometimes Fail in Impala Models The warning returns because resetting only clears the symptom, not the underlying cause. Modern vehicles continuously run self-diagnostic checks while operating. If the original problem persists, the computer will detect it again during these checks. The time until the warning returns depends on the severity of the issue. Some problems trigger immediate warnings, while others may take several drive cycles to reappear. Persistent warnings indicate a legitimate issue requiring proper repair. Chevy Impala Throttle Body Issues: The Main Culprit The throttle body is the most common cause of Chevy Impala reduced engine power warnings. Understanding how to diagnose, clean, and when to replace this component can save significant repair costs. Signs of a Failing Throttle Body in Impala A failing throttle body in an Impala typically causes erratic idle, hesitation during acceleration, and stalling. The engine may surge at idle or have difficulty maintaining consistent RPM. The check engine light will usually illuminate with specific throttle-related codes like P2135, P0121, or P0221. These indicate position sensor correlation errors or range/performance issues. Physical inspection may reveal carbon buildup on the throttle plate and housing. This black, sooty residue restricts proper movement and affects sensor readings. In severe cases, the throttle plate may stick or move erratically when the engine is running. This is often visible when looking into the throttle body with the air intake removed. DIY Throttle Body Cleaning for Impala Purchase quality throttle body cleaner specifically designed for electronic throttle bodies Disconnect the negative battery terminal to prevent electrical issues Remove the air intake duct to access the throttle body Take photos of all connections before disconnecting anything Spray cleaner onto a clean shop towel, not directly into the throttle body Gently clean the throttle plate and surrounding housing without forcing the plate open Allow all cleaner to evaporate completely before reassembly Reconnect all components and the battery Perform the throttle body relearn procedure When to Replace vs. Clean the Throttle Body Replace the throttle body if cleaning doesn't resolve the issue or if diagnostic codes specifically indicate throttle position sensor correlation errors (P2135). These suggest electronic failure rather than just contamination. Consider replacement if you've cleaned the throttle body multiple times within a short period. Repeated cleaning needs often indicate a failing component. Replace if there's visible damage to the throttle plate, housing, or electrical connections. Also replace if the throttle motor makes unusual noises or the plate moves erratically. Throttle Body Replacement Cost for Impala Service ProviderParts CostLabor CostTotal CostChevrolet Dealer$300-450$150-250$450-700Independent Shop$200-350$100-200$300-550DIY Replacement$200-350$0$200-350 Service StabiliTrak and Engine Power Is Reduced on Chevy Impala When service StabiliTrak and engine power reduced warnings appear together on your Impala, they indicate an issue affecting both stability control and engine management systems, often sharing common sensors or communication networks. Why StabiliTrak and Engine Power Warnings Appear Together The StabiliTrak system in Impala models actively manages engine power to maintain vehicle stability. Both systems rely on shared sensors including wheel speed sensors and steering angle sensors. The StabiliTrak module communicates directly with the engine control module via the vehicle's communication network. When communication problems occur, both systems may enter fail-safe modes. In many situations, the StabiliTrak system will request engine power reduction when it detects potential stability issues, making these systems inherently linked. Diagnosing Multiple Warning Lights in Impala Start diagnosis by scanning both the engine and ABS/stability control systems for codes. The relationship between codes often reveals the root cause. Check for common ground points between systems, as poor grounds can affect multiple electronic systems. Inspect wiring harnesses for damage, particularly near moving components. Test the battery and charging system thoroughly, as voltage issues commonly trigger multiple warnings. Consider having the vehicle's communication network tested if no obvious issues are found. Common Causes When Both Systems Fail Wheel speed sensor failures affecting both stability and engine management systems Steering angle sensor miscalibration or failure Battery and charging system issues causing voltage fluctuations Communication network problems between control modules Shared ground connection issues affecting multiple systems Throttle body problems affecting both power delivery and stability management Is There a Recall for Chevy Impala Reduced Engine Power? There is no specific recall for Chevy reduced engine power causes in Impala models, but GM has issued special coverage extensions for throttle bodies on certain model years and several technical service bulletins addressing power reduction issues. Official GM Recalls Related to Impala Power Issues While there isn't a specific recall for reduced engine power in Impala models, several related recalls may affect power delivery. Recall #15701 addressed electronic brake control module issues that could affect stability control and engine power management. Recall #14772 covered certain 2006-2013 models for potential engine wiring harness problems. This didn't specifically mention reduced power but could cause this symptom. Recall #14471 addressed transmission shift cable issues in certain models that could result in unexpected vehicle movement and related power management issues. Special Coverage for Impala Components GM issued Special Coverage Adjustment #14299 extending throttle body warranty coverage for many 2007-2013 Impala models. This isn't technically a recall but provides extended warranty protection. The coverage extends the throttle body warranty to 10 years or 120,000 miles from the original in-service date. It specifically addresses conditions that may cause the throttle body to fail, triggering reduced engine power mode. Some Impala models also received extended coverage for certain transmission components that could trigger power reduction warnings when failing. How to Check if Your Impala is Covered Locate your Vehicle Identification Number (VIN) on the driver's side dashboard or door jamb Visit NHTSA's recall website (nhtsa.gov/recalls) or GM's recall center (recalls.gm.com) Enter your VIN in the search field to view all applicable recalls Alternatively, call your local Chevrolet dealer with your VIN Ask specifically about special coverage #14299 for throttle body issues Request information about any applicable technical service bulletins Chevy Impala Low Engine Power Warning vs. Engine Power Is Reduced The low engine power warning and "Engine Power Is Reduced" messages on Chevy Impala models indicate similar but slightly different conditions. Understanding the distinction helps target the correct diagnostic approach. Different Power Reduction Messages The "Engine Power Is Reduced" message indicates the PCM has deliberately limited power to protect components. This is an active intervention by the vehicle's computer. The "Low Engine Power" warning typically indicates the computer has detected reduced performance without necessarily imposing limitations itself. This often points to mechanical rather than electronic issues. Both warnings appear on the driver information center but may have different trigger thresholds and causes specific to your Impala model year. Diagnostic Approach for Each Warning Type For "Engine Power Is Reduced," focus first on electronic throttle control components, sensors, and wiring. This warning is commonly triggered by sensor disagreements or communication errors. For "Low Engine Power," investigate mechanical issues like fuel delivery problems, exhaust restrictions, or engine mechanical failures. This warning often indicates the engine isn't producing expected power. Both warnings require retrieving diagnostic trouble codes as a first step, but the focus of your subsequent testing should reflect the specific message displayed. Common Confusion Between Warning Messages Many Impala owners mistakenly use these terms interchangeably, leading to confusion when researching solutions. The specific wording on your display provides important diagnostic clues. Some model years may display one message while technically being in the other condition. Always verify exactly what's displayed on your dashboard when seeking advice. Regardless of which message appears, both indicate problems requiring prompt attention to prevent potential damage or unsafe driving conditions. Real Fixes from Chevy Impala Owners That Actually Work Many Impala owners have successfully resolved engine power reduced Chevy Impala issues through community-sourced solutions, often finding simpler fixes than dealer recommendations. Most Successful DIY Fixes from Impala Forums Throttle body cleaning emerges as the most successful forum-recommended fix. Many owners report complete resolution after thoroughly cleaning carbon deposits from the throttle plate and housing. Accelerator pedal position sensor replacement has resolved many cases, particularly when owners experienced pedal response issues alongside power reduction warnings. This relatively inexpensive part has saved many from costly throttle body replacements. Battery replacement and charging system maintenance rank highly in success stories. Numerous owners found that simply replacing an aging battery eliminated reduced power warnings. Mechanic-Verified Solutions for Impala Power Issues Professional mechanics participating in forums confirm that disconnecting the battery for 30+ minutes often resolves electronic glitches causing reduced power warnings. This forces a complete system reset. Several independent mechanics recommend checking for stretched or damaged negative battery cables before replacing more expensive components. This often-overlooked issue can cause voltage fluctuations. Mechanics frequently suggest testing for excessive resistance in ground connections, particularly those under the battery tray and on the engine block. Cleaning these connections has resolved many intermittent issues. How Much Does It Cost to Fix Engine Power Is Reduced on Chevy Impala? Fixing engine power is reduced Impala issues varies widely in cost, from under $100 for cleaning or simple repairs to over $1,000 for major component replacement. Understanding typical costs helps owners budget appropriately. Repair TypeDealership CostIndependent ShopDIY CostThrottle Body Cleaning$150-200$100-150$10-20Throttle Body Replacement$450-700$300-550$200-350Accelerator Pedal Sensor$300-450$200-350$150-250MAF Sensor Replacement$300-400$200-300$100-200Wiring Repair$200-500$150-350$20-50PCM Reprogramming$150-300$100-200Not DIY DIY Fix Costs for Common Issues Throttle body cleaning requires only throttle body cleaner ($10-15) and basic hand tools. This simple maintenance can prevent many reduced power issues. Accelerator pedal position sensor replacement costs $150-250 for parts, with no special tools required beyond basic hand tools. This is one of the most cost-effective DIY repairs. Battery replacement costs $150-200 for a quality battery, while terminal cleaning and tightening costs nothing but time. This simple maintenance can prevent many electrical issues. Preventing Engine Power Is Reduced Warning in Your Chevy Impala Preventing Chevrolet reduced engine power message warnings requires proactive maintenance, attention to early warning signs, and appropriate seasonal preparation to keep critical systems functioning properly. Maintenance Schedule to Prevent Power Reduction: Clean the throttle body every 30,000 miles or when experiencing hesitation Replace the air filter at recommended intervals to protect the MAF sensor Maintain battery terminals clean and connections tight Use high-quality fuel from reputable stations to prevent contamination Have the charging system tested annually, particularly before winter Keep software updated through dealer service visits People Also Ask: Why does my 2008 Chevy Impala lose power when accelerating? Your 2008 Chevy Impala likely loses power when accelerating due to a failing throttle body, faulty accelerator pedal position sensor, or wiring issues. These components are particularly prone to failure in the 2008 model year and directly affect the electronic throttle control system that manages acceleration. Can a bad battery cause Engine Power Is Reduced in Chevy Impala? Yes, a bad battery commonly causes Engine Power Is Reduced warnings in Impala models. The electronic throttle control system requires stable voltage to function properly, and even slight voltage drops from a weak battery can trigger protective power reduction modes, especially in cold weather. How much does it cost to replace a throttle body on a Chevy Impala? Replacing a throttle body on a Chevy Impala typically costs $300-700 depending on where you have it done. Dealer service runs $450-700, independent shops charge $300-550, while DIY replacement costs $200-350 for parts only if you do the labor yourself. Will disconnecting battery reset Engine Power Is Reduced on Impala? Yes, disconnecting the battery for 15-30 minutes will temporarily reset the Engine Power Is Reduced warning on your Impala. However, if the underlying problem isn't fixed, the warning will likely return after driving a short distance as the vehicle's self-diagnostic systems recheck all components. Why does my Chevy Impala jerk when Engine Power Is Reduced warning is on? Your Impala jerks when the Engine Power Is Reduced warning is on because the computer is actively limiting throttle response and possibly altering transmission shift patterns. This protective measure creates abrupt power changes as the system tries to prevent potential damage while still providing minimal drivability. Does the Chevy Impala have a throttle body recall? The Chevy Impala doesn't have a formal throttle body recall, but GM issued Special Coverage Adjustment #14299 extending throttle body warranty to 10 years/120,000 miles for many 2007-2013 models. This coverage addresses the common throttle body failures that trigger reduced power warnings. How do I reset the throttle body on my Chevy Impala without a scanner? To reset your Impala's throttle body without a scanner, disconnect the negative battery terminal for 15-30 minutes, reconnect it, then perform the relearn procedure: turn ignition to ON position without starting for 3 minutes, turn off for 1 minute, then start the engine and let it idle for 3 minutes. What sensors cause Engine Power Is Reduced in Chevy Impala? The primary sensors that cause Engine Power Is Reduced in Chevy Impala are the throttle position sensors, accelerator pedal position sensors, and mass airflow sensor. These components directly affect the electronic throttle control system, and when they send conflicting or out-of-range signals, the computer activates protective power reduction.