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Looking for information about the common Hyundai engine codes? Our comprehensive guide covers everything you need to know about diagnosing and repairing Hyundai engine codes. Whether you’re a DIY mechanic or a certified Hyundai technician, our guide will help you get your Hyundai back on the road safely and efficiently. In this article, we have covered the most common and popular common engine codes for Hyundai vehicles. 1. Code P0011 Hyundai Description The P0011 code for a Hyundai vehicle relates to the CVVT (Continuously Variable Valve Timing) system, which is installed to the chain sprocket of the exhaust camshaft. Since the exhaust camshaft is driven by the timing belt, there is no variation in valve timing for this component. However, the timing of the intake camshaft can be varied by the relative operation of the CVVT vane to the housing. CVVT controllers control intake camshaft angle via oil pressure through OCVs (Oil Control Valve). This results in the optimal relative position between the camshaft and the crankshaft, which improves engine torque and fuel economy and decreases exhaust emissions through valve timing changes. During stable driving conditions, the deviation of the camshaft position from the target point is evaluated. This deviation is accumulated by the Engine Control Module (ECM) over a certain period and triggers the P0011 DTC when the accumulated deviation is too high. The target camshaft position is predetermined based on the engine speed and throttle angle programmed in the ECM. In this article, you can see detailed information about the code: Hyundai P0011 Code Repair Cost, How To fix, Symptoms, Causes & Mistakes 2. Code P0340 Hyundai Description The P0340 code for a Hyundai describes the Camshaft Position Sensor, an electronic device that records the rate of the camshaft's rotation to control ignition and fuel injection through the Engine Control Module (ECM). This sensor detects the retraction of the camshaft (intake) to identify a particular cylinder and senses the piston position. The sensor system includes a rotating disc and a static sensor, which detects changes in the magnetic field caused by high and low parts of the teeth as they pass the sensor. When the engine is running, the gap between the teeth and the sensor changes, which causes the voltage from the sensor to vary. In the event that the crankshaft position sensor (POS) system is not working properly, the camshaft position sensor can take over and provide engine control through the timing of cylinder identification signals. It is important to address any issues related to the Camshaft Position Sensor to ensure that the engine runs smoothly and efficiently and to prevent further damage to your vehicle. In this article you can read detailed information about Hyundai P0340 Code Repair Cost, How To fix, Symptoms, Causes & Mistakes. 3. Code P0335 Hyundai Description The P0335 code for a Hyundai relates to the Crankshaft Position Sensor (CKP), which is responsible for recording the speed at which the crankshaft is spinning within an engine. This device is essential in controlling the engine's ignition and fuel injection, with the data it provides being used by the Electronic Control Module (ECM). The sensor system is made up of two parts: a rotating element, typically in the form of a disc, and a static part - the actual sensor as the engine is running, the high and low parts of the teeth on the rotating disc cause the gap with the sensor to change. This changing gap then causes the magnetic field near the sensor to also change. As a result, the voltage from the sensor changes, allowing the ECM to accurately track the speed of the crankshaft. It is important to have any issues related to the CKP sensor diagnosed and repaired promptly to avoid further damage to your vehicle and ensure that it is running safely and efficiently. A certified Hyundai technician can use specialized diagnostic equipment to pinpoint the exact cause of the issue and perform any necessary repairs or replacements to get your vehicle running smoothly again. Read our dedicated post on Hyundai P0335 Code Repair Cost, How To fix, Symptoms, Causes & Mistakes to know more. 4. Code P1186 Hyundai Description The P1186 code for a Hyundai diesel engine indicates an issue with the rail pressure sensor signal. The Engine Control Module (ECM) of the Common Rail diesel engine uses this signal to control the Fuel Pressure Regulator Valve (which is integrated with the high-pressure pump) to maintain optimum rail pressure based on the current engine rpm and load. If the rail pressure deviates from the target value set by the ECM due to mechanical or electrical issues, the ECM will shut down the engine and set a Diagnostic Trouble Code (DTC) by limiting fuel (stopping injector operation) to prevent abnormal engine control. The DTC that is set, "rail pressure monitoring error," diagnoses the low-pressure fuel supply state, mechanical operating conditions of the high-pressure pump, and, indirectly, the rail pressure sensor (RPS) output voltage and duty. Repairing this DTC requires a mechanic who has a complete understanding of the fuel system. Therefore, it is important to have the issue diagnosed and repaired by a certified Hyundai technician to ensure that the problem is properly resolved and to prevent any further damage to the vehicle. 5. Code P0300 Hyundai Description The Code P0300 for a Hyundai is a diagnostic trouble code that indicates a misfire in the engine. When a misfire occurs, the engine speed fluctuates, which can cause the signal from the Crankshaft Position (CKP) sensor to vary. The Engine Control Module (ECM) can then detect the variation in the CKP sensor signal and determine that a misfire is taking place. 6. Code P0106 Hyundai Description Code P0106 for Hyundai is related to the Manifold Absolute Pressure (MAP) sensor, which measures the pressure inside the intake manifold. The pressure in the intake manifold is influenced by various factors such as engine speed, throttle opening, air temperature, Barometric Pressure (BARO), and turbocharger output if equipped. The MAP sensor contains a diaphragm that responds to the pressure changes created by the engine's varying load and operating conditions. This diaphragm displacement is then converted into electrical resistance and sent to the Engine Control Module (ECM) via 3 circuits. The ECM provides a regulated 5 volts to the MAP sensor on a 5 V reference circuit, while the ground is supplied on a low reference circuit. The MAP sensor signal circuit relays a signal voltage to the ECM that correlates to the pressure changes in the intake manifold. The ECM then translates this voltage input into a pressure value. The highest pressure that can exist in the intake manifold under normal conditions is at ignition ON, engine OFF, which is equal to the BARO. Conversely, the lowest manifold pressure occurs during idling or deceleration. The ECM constantly monitors the MAP sensor signal for pressure outside of the normal range. If the MAP sensor is stuck within the normal operating range, the ECM will detect this abnormality and trigger the Diagnostic Trouble Code (DTC) P0106. The ECM accomplishes this by running three different models within the software to determine the values. 7. Code P0014 Hyundai Description The Code P0014 for Hyundai describes the function of the CVVT (Continuously Variable Valve Timing) system installed to the exhaust camshaft's chain sprocket. Unlike the exhaust camshaft, there is variation in the valve timing of the intake cam due to the relative operation of the CVVT vane to the housing. This system's OCV (Oil Control Valve) uses oil pressure to regulate the intake camshaft angle, allowing the relative position between the camshaft and the crankshaft to be optimal. This results in improved engine torque, fuel economy, and reduced exhaust emissions by changing the valve open/close timing of the intake camshaft. As the engine is operating under stable conditions, the ECM evaluates the deviation of the camshaft position from the target point, accumulating this deviation for a certain period. As soon as the accumulated deviation gets too high, the ECM sets DTC P0011. The target camshaft position is predetermined based on engine speed and throttle angle in the ECM. 8. Code P0455 Hyundai Description Hyundai's code P0455 detects leaks in the EVAP (Evaporative Emissions Purge) purge line using the vacuum generated by the engine intake manifold. If pressure fails to increase, the Engine Control Module (ECM) will search for leaks in the line that runs to the EVAP canister purge volume control solenoid valve when under vacuum. This is accomplished by opening the vacuum cut valve bypass valve, which clears the line between the fuel tank and the solenoid valve for the EVAP volume control. The EVAP canister vent control valve will then close, shutting off the EVAP purge line. The intake manifold vacuum is then used to depressurize the EVAP purge line using the EVAP volume control solenoid valve. The EVAP canister purge volume control solenoid valve will be closed once the depressurization process has been completed. 9. Code P0441 Hyundai Description The P0441 code for a Hyundai is related to the Evaporative Emission (EVAP) system and is diagnosed by the Engine Control Module (ECM). The ECM tests the EVAP system for several conditions, including excess vacuum, large and small leaks, purge flow during non-commanded conditions, fuel level and fuel pressure sensor faults, and EVAP Purge and Vent Valve faults. EVAP system vacuum and pressure are monitored by the ECM using the Fuel Tank Pressure sensor. When the ECM detects that the conditions have been met, the EVAP Purge Solenoid and the EVAP Vent Valve are commanded to apply an engine vacuum to the EVAP system. In order for the EVAP Purge Solenoid to be turned OFF, the system must reach a predetermined vacuum level. This test verifies if a vacuum can be achieved in the EVAP system, and a failure to do so may be caused by a large leak or a restriction. To ensure that the EVAP system is functioning properly and to avoid any potential safety hazards, a certified Hyundai technician should diagnose and repair the issue as soon as possible. 10. Code P0420 Hyundai Description Code P0420 for a Hyundai describes how the efficiency of the catalytic converter is determined by its ability to oxidize CO and hydrocarbon emissions. The Powertrain Control Module (PCM) uses output signals from both the front and rear oxygen sensors to determine whether the rear sensor's output is beginning to match the front sensor's output. To compensate for changes in the rich-to-lean combustion cycle, the air/fuel mixture is adjusted to keep the front oxygen sensor's frequency high. The catalyst causes the rear oxygen sensor to have a lower frequency. As the catalyst wears, the rear oxygen sensor's signal trace begins to match the front oxygen sensor's signal trace. This occurs because the catalyst becomes saturated with oxygen and cannot convert hydrocarbon and CO into H₂O and CO₂ with the same efficiency as when it was new. A completely worn catalyst shows a 100% match between the frequency of the front and rear sensors. It is important to have the issue diagnosed and repaired by a certified mechanic to ensure the proper functionality of the catalytic converter and to reduce emissions. 11. Code P2096 Hyundai Description The P2096 code for Hyundai vehicles is related to the efficiency of the catalytic converter in oxidizing CO and hydrocarbon emissions. The Powertrain Control Module (PCM) compares the output signals of the front and rear oxygen sensors to determine whether the rear sensor is starting to match the front sensor's output. The air/fuel mixture compensation keeps the frequency of the front oxygen sensor high due to changes in the combustion process from rich to lean. On the other hand, the catalyst causes the rear oxygen sensor to have a lower frequency. As the catalyst wears, the signal trace of the rear oxygen sensor begins to match the front oxygen sensor's signal trace. This is due to the catalyst becoming saturated with oxygen and losing efficiency in converting hydrocarbon and CO into H₂O and CO₂, compared to when it was new. If the catalyst is completely worn out, it will show a 100% match between the frequency of the front and rear sensors. 12. Code P1326 Hyundai Description The P1326 code for Hyundai vehicles indicates an issue with the Knock Sensor Detection System (KSDS), which is designed to detect vibrations indicating excessive connecting rod bearing wear. The purpose of the system is to alert the driver at an early stage of bearing wear before severe engine damage, including engine failure, occurs. If vibrations caused by bearing wear are detected, the Malfunction Indicator Lamp (MIL) will blink continuously, and the vehicle will be placed in Limp Home Mode. This is a safety feature that reduces the risk of further damage to the engine and prevents occupants from being exposed to the danger of a more severe engine failure. When this happens, a Diagnostic Trouble Code (DTC) P1326, specific to the KSDS, will be recorded in the Engine Control Unit (ECU). The vehicle can still be operated for a limited time in Limp Home Mode, but acceleration will be slow, and the maximum speed will be reduced. Additionally, engine RPMs will be limited to approximately 1800-2000 RPM. 13. Code P1529 Hyundai Description The P1529 code for Hyundai vehicles refers to a communication issue between the Transmission Control Module (TCM) and the Engine Control Module (ECM). Specifically, the TCM can request that the Malfunction Illumination Lamp (MIL) be activated by sending a signal to the ECM. It's important to note that this is only a request and not a direct command. When this code is triggered, the fault code is stored in the TCM. To diagnose the issue, a professional mechanic should use a Scantool to select the Transaxle system and monitor any DTCs related to the automatic transaxle system. This will help to pinpoint the exact cause of the communication issue and ensure that the proper repairs are made to resolve the issue. 14. Code P0741 Hyundai Description The P0741 code description for a Hyundai vehicle indicates that the Transmission Control Module (TCM) activates the torque converter clutch solenoid valve when the gear is in D4, based on signals received from the vehicle speed and the Engine Control Module (ECM). This controls the operation of the lockup piston, engaging the torque converter lockup clutch and creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter. However, lockup operation is not allowed when the Automatic Transmission fluid temperature is too low. Under lockup conditions, if the accelerator pedal is depressed (less than 2/8), the engine speed should not change abruptly. If there is a significant jump in engine speed, this indicates that there is no lockup occurring. 15. Code P0016 Hyundai Description It is important to understand the intricacies of the CVVT (Continuously Variable Valve Timing) system. This system is installed to the chain sprocket of the exhaust camshaft, which is driven by the timing belt. Unlike the exhaust camshaft, there is variation in valve timing of the intake camshaft due to the relative operation of the CVVT vane to the housing. The CVVT controller is responsible for regulating the intake camshaft angle using oil pressure through the OC. The OC stands for Oil Control Valve. By doing so, the relative position between the camshaft and the crankshaft becomes optimal, improving engine torque and fuel economy and decreasing exhaust emissions by changing the valve open/close timing of the intake camshaft. During stable driving conditions, the Engine Control Module (ECM) evaluates the deviation of the camshaft position from the target point. If the accumulated deviation is too high, the ECM sets DTC P0011, indicating that the target camshaft position is a predetermined value depending on engine speed and throttle angle. 16. Code P0171 Hyundai Description Code P0171 for a Hyundai indicates that there is an issue with the Air/Fuel Mixture Ratio Self-Learning Control. This system is responsible for ensuring that the actual air/fuel mixture ratio is brought as close as possible to the theoretical ratio, using feedback signals from the heated oxygen sensors 1. The Engine Control Module (ECM) constantly calculates the necessary compensation needed to correct any offset between the actual and theoretical ratios. However, if the amount of compensation required is deemed to be extremely large (i.e., the actual mixture ratio is too lean), the ECM will detect this as a fuel injection system malfunction and illuminate the Malfunction Indicator Light (MIL) using a 2 trip detection logic. It is important to have this issue diagnosed and repaired by a certified automotive technician who can use specialized diagnostic equipment and knowledge to identify and fix the underlying issue causing this code. Prompt attention to this issue can prevent further damage to your vehicle and ensure that it is running safely and efficiently. 17. Code P1690 Hyundai Description The P1690 code for Hyundai relates to the immobilizer system, which serves as an added layer of security to prevent vehicle theft. This system disables the vehicle unless the proper ignition key is used. The SMARTRA, which is mounted at the ignition lock near the antenna coil for RF transmission and receiving, communicates with the built-in transponder of the ignition key. This wireless communication runs by RF with a frequency of 125 kHz. During communication, the SMARTRA converts the RF signal from the transponder received by the antenna coil into messages for serial communication. After the EMS receives the messages, the antenna transmits the RF signal to the transponder. The SMARTRA executes the encryption algorithm and transmits the encryption result. It also relays the information from EMS to Transponder. In the key learning process, SMARTRA stores the DPN (converted from PIN) in memory. To neutralize the SMARTRA, this DPN (converted from PIN) is used in the encryption algorithm between EMS and SMARTRA. SMARTRA deletes old DPNs (converted from PINs) and SEKs (generated from DPNs) when it is neutral. A new DPN (converted from a PIN) can be stored in neutral SMARTRA. SMATRA Learning is possible when SMARTAR is virgin or neutral. When the SMARTRA3 is learned, it transmits information about whether the DPN (converted from PIN) inputted from the tester matches the DPN (converted from PIN) in SMARTRA. SMARTRA Learning is possible regardless of key status. Communication between SMARTRA and EMS is encrypted with SEK (generated from DPN). During SMARTRA3 learning, DPN (converted from PIN) is converted to SEK (generated from DPN). In EEPROM, the SEK (generated from DPN) will be stored in the SMARTRA learned. The EMS stores the SEK (generated from DPN) in EEPROM in case one more key is taught validly. EMS would not accept the request for key learning if the DPN (converted from PIN) inputted from EMS fails over 3 trials (3 trials: continuously or intermittently). It is important to note that disconnecting the battery or any other manipulation cannot reduce this time. After reconnecting the battery to the EMS, the timer starts again for one hour. 18. Code P0456 Hyundai Description In the context of the Hyundai, the P0456 code is related to the detection of leaks in the Evaporative Emission System (EVAP) purge line by utilizing the engine intake manifold vacuum. After the vacuum test is complete, the Engine Control Module (ECM) will inspect the fuel tank-EVAP canister purge volume control solenoid valve for possible leaks if the pressure does not increase. By opening the bypass valve on the vacuum cut valve, you can clear the line connecting the fuel tank to the solenoid valve controlling the EVAP canister purge volume. Once this is done, the EVAP canister vent control valve will be closed to shut off the EVAP purge line. Next, the EVAP canister purge volume control solenoid valve is opened, causing the EVAP purge line to be depressurized by utilizing the engine intake manifold vacuum. Once the depressurization process is completed, the EVAP canister purge volume control solenoid valve is closed. It is important to note that a P0456 code can indicate several issues, such as a leak in the EVAP system, a faulty EVAP canister purge volume control solenoid valve, or a loose or damaged gas cap. A certified Hyundai technician can utilize specialized diagnostic equipment to identify the specific cause of the issue and perform any necessary repairs or replacements to ensure that the vehicle is running safely and efficiently. 19. Code P0170 Hyundai Description The P0170 code for a Hyundai is related to the Air/Fuel Mixture Ratio Self-Learning Control system, which is designed to bring the actual mixture ratio closer to the theoretical mixture ratio based on feedback signals from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct any offset between the actual and theoretical ratios. However, if the amount of compensation required is extremely large, indicating that the actual mixture ratio is too lean, the ECM will illuminate the Malfunction Indicator Light (MIL) after two trip detections. In this case, the ECM determines that the fuel injection system may be malfunctioning. When the Fuel Injection System is not operating correctly or when the mixture ratio compensation amount is incorrect, the Diagnostic Trouble Code (DTC) will be set. It's important to address this issue promptly, as a malfunctioning fuel injection system can lead to reduced engine performance, poor fuel economy and increased emissions. A certified Hyundai technician can use specialized diagnostic equipment to pinpoint the exact cause of the issue and perform any necessary repairs or replacements to get your vehicle running smoothly again. 20. Code P0711 Hyundai Description This code relates to the Automatic Transmission Fluid (ATF) temperature sensor, which is located within the Valve Body of the transmission. The sensor uses a thermistor to measure changes in temperature, which results in changes in resistance. The Transmission Control Module (TCM) provides a 5V reference voltage to the sensor, and the output voltage of the sensor varies in response to changes in ATF temperature. The ATF temperature is critical information for the TCM to accurately control the Torque Converter Clutch. Additionally, the temperature data from the sensor is used for other important purposes in the transmission's operation. 21. Code P0715 Hyundai Description The P0715 code for a Hyundai vehicle relates to the input (turbine) speed sensor. This sensor outputs pulse signals based on the revolutions of the input shaft of the transmission. The Transmission Control Module (TCM) determines the input shaft speed by counting the frequency of these pulses. The input shaft speed is an essential parameter used by the TCM to control the optimum fluid pressure during shifting. The input speed sensor location can vary depending on the model and year of the Hyundai vehicle. In general, this sensor is located on the transmission and can be found on the 1999-2006 Hyundai Sonata, 2001-2007 Hyundai Elantra, 2001-2007 Hyundai Santa Fe, 2001 Hyundai XG, 2002-2005 Hyundai XG350, 2003 Hyundai Tiburon, 2005-2009 Hyundai Tucson, 2006 Hyundai Azera, and 2007 Hyundai Entourage. 22. Code P2187 Hyundai Description In order to achieve optimal performance in terms of drivability, fuel economy, and emission control, the Powertrain Control Module (PCM) utilizes a closed-loop air/fuel metering system. This system employs the use of the Heated Oxygen Sensor (HO2S) to monitor the air/fuel ratio and adjust fuel delivery accordingly through closed-loop fuel control. The long-term and short-term fuel trim values indicate changes in fuel delivery. The ideal fuel trim value is approximately 0%. If the HO2S signal indicates a lean condition, the PCM will add fuel, which is indicated by fuel trim values above 0%. Conversely, if the HO2S signal indicates a rich condition, the PCM will reduce fuel, which is indicated by fuel trim values below 0%. If the fuel trim levels reach excessive levels due to a lean or rich condition, the relevant Diagnostic Trouble Code (DTC) for fuel trim will be set. It is important to address any issues related to the air/fuel metering system promptly to ensure optimal vehicle performance and reduce emissions. A certified automotive technician can diagnose and repair any issues related to this system using specialized diagnostic equipment and expertise. 23. Code P0301 Hyundai Description Code P0301 in Hyundai vehicles is an indication of a misfire in engine cylinder 1. A misfire occurs when there is incomplete combustion in the cylinder. When this happens, the engine speed fluctuates, causing the Crankshaft Position (CKP) sensor signal to vary. The Engine Control Module (ECM) monitors this variation and can detect the misfire. The misfire can cause several problems, such as reduced engine performance, rough idling, and increased emissions. 24. Code P0750 Hyundai Description Code P0750 for Hyundai vehicles pertains to the operation of Shift Solenoid Valve 'A,' which is controlled by the Transmission Control Module (TCM). The TCM responds to signals from various sensors, such as the Park/Neutral Position (PNP) switch, vehicle speed sensor, and Engine Control Module (ECM), specifically the throttle opening. Based on these signals, the TCM decides whether to turn the solenoid valve ON or OFF and, consequently, shift gears to the optimal position. Therefore, the P0750 code indicates an issue with Shift Solenoid Valve 'A,' which can cause drivability problems and potentially lead to further damage if left unaddressed. 25. Code P0133 Hyundai Description Code P0133 for a Hyundai refers to an issue with the front heated oxygen sensor (also known as O2 sensor 1), which is situated in the exhaust manifold. Its primary function is to measure the amount of oxygen in the exhaust gas relative to the outside air. The front heated oxygen sensor 1 is constructed with a closed-end tube composed of ceramic zirconia. The zirconia produces a voltage ranging from approximately 1V in richer conditions to 0V in leaner conditions. The signal from the front heated oxygen sensor 1 is then transmitted to the Engine Control Module (ECM), which regulates the injection pulse duration to achieve the ideal air-fuel ratio. The optimal air-fuel ratio occurs near the abrupt transition from 1V to 0V. Therefore, a P0133 code indicates that the front heated oxygen sensor 1 has not responded quickly enough to the changing air-fuel ratio, potentially resulting in a suboptimal air-fuel mixture and reduced engine performance. 26. Code P0442 Hyundai Description Code P0442 in a Hyundai vehicle refers to an issue with the Evaporative Emission (EVAP) system, which is responsible for reducing harmful emissions from the fuel tank and engine. The Engine Control Module (ECM) continuously monitors the EVAP system for various conditions, such as large and small leaks, excess vacuum, and fuel sensor faults. The fuel Tank Pressure Sensor is used to determine the level of vacuum/pressure in the EVAP system, and the ECM controls both EVAP Purge Solenoid and EVAP Vent Valve when the conditions are met for the engine vacuum to be applied to the EVAP system. Once a predetermined level of vacuum is reached, the ECM commands the EVAP Purge Solenoid OFF. Failure to develop a vacuum in the EVAP system may be caused by a large leak or a restriction in the system. This test is intended to verify whether a vacuum can be achieved in the system. 27. Code P0700 Hyundai Description The Transmission Control Module (TCM) is responsible for monitoring the performance of various sensors and actuators that are related to the transmission control system. If the TCM detects a malfunction with the control system, it sends a signal to the Engine Control Module (ECM) to trigger the illumination of the Engine Light or Service Engine Soon light. The ECM stores the P0700 code, indicating that the TCM has detected a malfunction with the transmission controls. This code serves as a general indicator that further diagnostic tests are needed to determine the specific issue within the transmission system. Proper diagnosis and repair by a certified technician are crucial to prevent any further damage to the vehicle and ensure that it runs smoothly and safely. 28. Code P2106 Hyundai Description Code P2106 for a Hyundai vehicle is related to the Electronic Throttle Control (ETC) system. This system consists of various components, including the throttle body, Throttle Position Sensors (TPS) 1&2, and Accelerator Position Sensors (APS) 1&2. The throttle body contains the actuator, throttle plate, and throttle position sensor, all integrated into one housing. The actuator includes a DC motor with a two-stage gear, and the throttle position sensor detects the opening angle of the throttle valve, which is critical for proper engine performance. The throttle position sensor provides feedback to the Powertrain Control Module (PCM) to enable it to control the throttle motor effectively, ensuring proper throttle valve opening angle in response to the driving conditions. If the PCM detects any discrepancies or issues with this system, it triggers the P2106 code. 29. Code P0018 Hyundai Description The Code P0018 for Hyundai vehicles is related to the Continuously Variable Valve Timing (CVVT) system. Specifically, the CVVT system is installed to the chain sprocket of the exhaust camshaft, which means there is no variation in valve timing of the exhaust cam as it is driven by the timing belt. Conversely, the timing of the intake cam can vary depending on the relative operation of the CVVT vane and the housing. Through the Oil Control Valve (OCV), the CVVT controller regulates the intake camshaft angle. The optimal relative position between the camshaft and the crankshaft is achieved through this process, resulting in improved engine torque, fuel economy, and decreased exhaust emissions by changing the valve open/close timing of the intake camshaft. During stable driving conditions, the Engine Control Module (ECM) evaluates the deviation of the camshaft position from the target point. The ECM accumulates this deviation for a certain period and sets DTC P0018 when the accumulated deviation is too high. 30. Code P1693 Hyundai Description The Code P1693 for Hyundai refers to an issue with the vehicle immobilizer system, which is comprised of the Engine Control Module (ECM), the SMARTRA3, and ignition keys with a built-in transponder. To ensure the proper operation of the immobilizer system, the ECM conducts a check of the ignition key using a special encryption algorithm in conjunction with the SMARTRA3 and Transponder. Once the IGN is switched on, the ECM proceeds with the key authentication process after SMARTRA3 authentication. If the key authentication is confirmed by the SMARTRA3, the engine can be started. However, if the Transponder fails to send data or sends corrupted data, the ECM will detect this issue and set a Diagnostic Trouble Code (DTC) P1693. This can cause the engine to not start or stall after starting. Wrap Up In conclusion, there are several common engine codes that can affect Hyundai vehicles. These codes include issues related to the Mass Airflow (MAF) Sensor Circuit, the Rear Heated Oxygen Sensor Circuit, and the Vehicle Immobilizer System. Symptoms of these codes can include reduced engine performance, poor fuel economy, increased emissions, and the illumination of the check engine light on the dashboard. It’s important to have these issues diagnosed and repaired promptly by a certified Hyundai technician to prevent further damage to your vehicle and ensure that it is running safely and efficiently. Proper maintenance of your Hyundai, including regular servicing and the use of quality parts, can help prevent these issues from occurring. Additionally, monitoring your vehicle’s performance and addressing any issues as soon as they arise can help prevent more costly repairs down the line. I hope you find the article "The 30 Most Common Hyundai Engine Codes" helpful.