The P0735 Volkswagen code denotes a transmission issue where the Transmission Control Module (TCM) detects an incorrect gear ratio preventing a shift into 5th gear. This problem often arises from low or contaminated transmission fluid, faulty shift solenoids, or mechanical failures such as worn gears or clutches. Symptoms include rough shifting, high engine revs, increased fuel consumption, and potential engine damage risk. Diagnosis requires tools like a digital multimeter and transmission fluid pressure gauge. In terms of safety, operating the vehicle in this condition is dangerous, necessitating prompt repair. Discover comprehensive solutions and enhance your Volkswagen's performance.
P0735 VW Code Meaning
The P0735 code in VW cars means there's a problem with the automatic transmission. It can't shift into 5th gear like it should. This happens when the Transmission Control Module (TCM) notices that the gear position isn't what it expects. This can cause issues with how the car runs.
Why does this code show up?
- Transmission fluid might be low or dirty, which can mess up hydraulic pressure needed for shifting gears.
- Shift solenoids could be acting up, causing wrong fluid flow and gear ratios.
- Mechanical parts like gears might be worn out or damaged.
How do you figure out what's wrong?
- Check the transmission fluid to see if it's low or dirty.
- Look at the wiring connected to the TCM for any damage or loose connections.
- Make sure the hydraulic control circuit works as it should.
Fixing these things can help get the transmission working again.
Error Code P0735 Symptoms
When a Volkswagen car shows the P0735 error code, it means there's a problem with the automatic transmission not shifting properly into 5th gear. This can lead to several noticeable issues with how the car drives.
- Check Engine Light Turns On: The check engine light will light up, signaling that something needs checking.
- High Engine Revs on the Highway: You might find the engine revs up more than usual, especially on highways, since it struggles to switch to 5th gear.
- Rough or Unpredictable Shifting: The car might shift gears roughly or unpredictably, making the ride less smooth.
- More Fuel Use and Limp Mode: The car could use more fuel than normal and might switch to "limp mode," which limits how the transmission works to avoid more damage.
Causes of VW P0735 Fault Code
The P0735 fault code in Volkswagen vehicles signals a problem with the gear ratio in 5th gear. This issue usually arises from problems in the automatic transmission system.
One common cause is low transmission fluid levels, which leads to a lack of pressure needed for proper gear engagement. If the fluid is dirty, it can also cause trouble by making it hard for the transmission to shift gears correctly.
Shift solenoids, which help control the flow of transmission fluid, can sometimes malfunction and disrupt the shifting process. This can cause the incorrect gear ratio.
Mechanical issues, like worn-out clutches or gears, or problems in the hydraulic control system, are other possible causes. These mechanical failures can make the onboard diagnostic system detect incorrect gear ratios.
Here's a quick rundown of potential causes:
- Low transmission fluid levels
- Dirty transmission fluid
- Faulty shift solenoids
- Mechanical issues in the transmission system
Tools Needed to Diagnose
To fix the P0735 fault code in Volkswagen cars, you'll need some tools. These tools help find and fix problems with the car's transmission.
- Digital Multimeter: This tool checks electrical circuits. It helps find wiring problems that might cause the P0735 code. Fixing these problems ensures the car's electrical system works well.
- Transmission Fluid Pressure Gauge: This measures the pressure of the transmission fluid. It shows if there are problems with the fluid pressure that could affect how the car shifts gears.
- Scan Tool: This tool reads and clears diagnostic trouble codes (DTCs). It shows the current status of the transmission system and helps reset codes after fixing the issues.
- Basic Hand Tools: These help you get to the transmission and its parts for inspection and repair.
- Transmission Fluid Dipstick or Funnel: Use this to check the fluid level and its condition. Proper fluid levels are crucial for the transmission to work smoothly.
These tools make it easier to find and fix what's wrong with the car's transmission system.
How to Fix P0735 VW Error Code – Step by Step
Step 1:
Check the transmission fluid level and condition. Ensure the fluid is at the proper level and free from debris or discoloration.
If the fluid is low or contaminated, replace it along with the transmission filter to restore optimal performance.
Step 2:
Inspect the shift solenoids, which are crucial for gear engagement. Verify their functionality and replace any defective solenoids that could be preventing proper shifting into fifth gear.
Step 3:
Examine the wiring harness and connectors for signs of damage, corrosion, or loose connections.
These issues can disrupt the electrical signals required for proper gear operation.
Step 4:
Use an OBD-II scanner to clear the P0735 error code once the above issues have been addressed.
This prepares the system for a fresh evaluation of the repairs.
Step 5:
Conduct a test drive to ensure the vehicle shifts smoothly through all gears, particularly the fifth gear.
This confirms that the P0735 error code issue has been resolved following the systematic approach.
Common Diagnosis Mistakes
If you're trying to fix the P0735 error code in a Volkswagen, there are a few key things to check. This code means there's an issue with the gear ratio for the fifth gear, often pointing to transmission problems.
First, look at the transmission fluid. If it's low or in bad shape, it can mess up gear engagement and cause this error. Always start by checking this simple yet important item.
Next, examine the shift solenoids. These parts help control when gears change, so if they're not working right, you might see wrong gear ratios. Testing these should be one of the first steps.
Also, don't forget to do a visual check of the wiring harness and connectors. Wires that are damaged or connections that are loose can stop the transmission from talking to the control module properly, which might show up as error codes.
Finally, take a look at the transmission hydraulic control circuit. If there are problems here, gears might not shift as they should. Consider mechanical issues too, like worn-out gears or broken parts, since these can also lead to gear ratio problems.
Steps to Diagnose:
- Check the transmission fluid level and condition.
- Test the shift solenoids.
- Inspect the wiring harness and connectors.
- Review the transmission hydraulic control circuit.
P0735 VW Repair Cost
When you have a P0735 code for your Volkswagen, it's helpful to know how much the repairs might cost.
Diagnosing the problem usually takes about an hour, with a cost between $75 and $150 per hour, depending on the car repair shop.
If the fix is simple, like changing the transmission fluid, expect to pay between $100 and $200.
This price varies based on the model of your car and where you get the service.
If the problem is more serious, like broken parts inside the transmission or faulty solenoids, the repair could cost more than $1,000.
This higher cost covers the parts and labor needed to fix bigger issues with the transmission.
Knowing these different costs can help you decide how to handle repairs for your Volkswagen.
Related Error Codes on Volkswagen
Fixing a P0735 code on your Volkswagen involves more than just cost considerations. It's also about finding related error codes for a full diagnosis. Codes like P0730, P0731, P0732, P0733, and P0734 suggest transmission issues. These might include low fluid, bad shift solenoids, or mechanical problems. When these codes show up together, it often means trouble in the transmission control module or hydraulic system, not just one gear.
Check the transmission fluid level and condition if you see these codes. Look at the wiring and connectors for any damage or rust. Fixing these codes quickly can stop more damage. Here's a table of related error codes:
| Error Code | Description | Possible Causes |
|---|---|---|
| P0730 | Incorrect Gear Ratio | Low fluid, TCM issue |
| P0731 | Gear 1 Incorrect Ratio | Shift solenoid failure, wiring |
| P0732 | Gear 2 Incorrect Ratio | Hydraulic system problem |
| P0733 | Gear 3 Incorrect Ratio | Mechanical transmission issue |
Diagnosing these codes needs a careful look at the transmission parts to keep your car running smoothly. Taking action early can help avoid big repair bills.
Can I drive safely with P0735 VW?
No, it's not safe to drive with a P0735 code in a Volkswagen.
The car can't shift to 5th gear, which can make driving dangerous and damage the engine.
Get it checked by a mechanic right away to avoid bigger problems.
People Also Ask
What Are the Long-Term Effects of Ignoring the P0735 Code?
Ignoring the P0735 code can make your car's transmission wear out faster and could even break. It might use more gas too. If you keep ignoring it, fixing it later could cost a lot of money and make other problems happen.
How Does the Transmission System Relate to the P0735 Error?
The P0735 error happens when your car's transmission doesn't shift correctly. This error means the gear ratios are wrong, which can cause the transmission to not work well. It relies on the right hydraulic pressure and working parts to shift gears properly.
Is the P0735 Code Common in All Volkswagen Models?
The P0735 code isn't common in all Volkswagen cars. It can show up more in older models or cars with lots of miles because parts might wear out. Whether it appears depends on the car's year, type of transmission, and how much it's been driven.
Can Regular Maintenance Prevent the P0735 Error Code?
Yes, regular maintenance can help stop the P0735 error code. By changing transmission fluid, checking solenoids, looking at hydraulic systems, and fixing leaks, you keep the transmission working well. This helps prevent errors with gear ratios and keeps your car running smoothly.
Are There Any Software Updates That Address the P0735 Issue?
Yes, Volkswagen sometimes has software updates to fix problems like the P0735 issue, which is about wrong gear ratios. It's best to check with a Volkswagen service center to make sure your car has the latest updates for better performance.