P0735 BMW Code - Gear 5 Incorrect ratio
Quick Answer
This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by Transmission Control Module (TCM) as follows: Torque converter slip ratio = A x C/B A: Output shaft revolution signal from revolution sensor B: Engine speed signal from Engine Control Module (ECM) C: Gear ratio determined as gear position which TCM supposes If the actual gear position is higher than the position (5th) supposed by TCM, the slip ratio will be more than normal. Common causes include Low transmission fluid level, Dirty transmission fluid, Shift solenoids. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0735 BMW indicates Gear 5 Incorrect ratio.
- Common causes
- Common causes include Low transmission fluid level, Dirty transmission fluid, Shift solenoids.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0735 BMW Description
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from Engine Control Module (ECM)
C: Gear ratio determined as gear position which TCM supposes
If the actual gear position is higher than the position (5th) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.
What are the Possible Causes of the DTC P0735 BMW?
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit
How to Fix the DTC P0735 BMW?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0735 BMW code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0735 BMW Code
1. What are common symptoms of OBDII code P0735 in a BMW related to Gear 5 Incorrect ratio?
- Common symptoms include harsh shifting between gears, slippage in the transmission, and illuminated Check Engine Light.
2. What are some possible causes of OBDII code P0735 in a BMW indicating Gear 5 Incorrect ratio?
- Potential causes include a faulty shift solenoid, low transmission fluid levels, a worn-out clutch or gear components, or issues with the transmission control module.
3. How can I diagnose the OBDII code P0735 in a BMW for Gear 5 Incorrect ratio?
- Diagnosis typically involves using an OBDII scanner to retrieve the code, checking the transmission fluid level and condition, inspecting the transmission components for wear, and testing the shift solenoids.
4. Can driving with OBDII code P0735 in a BMW indicating Gear 5 Incorrect ratio cause further damage?
- Continuing to drive with this code may potentially lead to more severe transmission issues, such as complete transmission failure or damage to other components.
5. What are some repair tips for addressing OBDII code P0735 in a BMW due to Gear 5 Incorrect ratio?
- Repair tips may include checking and topping up the transmission fluid, replacing faulty shift solenoids, inspecting and repairing worn-out clutch or gear components, and resetting the transmission control module.
6. Is it recommended to reset the OBDII code P0735 in a BMW after addressing Gear 5 Incorrect ratio issues?
- Yes, it is advisable to reset the code after addressing the underlying issues. This can be done using an OBDII scanner or by disconnecting the car's battery for a few minutes.
7. How much does it typically cost to repair OBDII code P0735 in a BMW related to Gear 5 Incorrect ratio?
- Repair costs can vary depending on the exact cause of the issue, but they may range from a few hundred to over a thousand dollars, especially if major transmission components need to be replaced.
8. Can a DIY enthusiast attempt to fix OBDII code P0735 in a BMW indicating Gear 5 Incorrect ratio?
- While some basic checks and maintenance tasks can be done by DIY enthusiasts, diagnosing and repairing transmission issues like P0735 often require specialized tools and expertise, so it's recommended to consult a professional mechanic.
9. How long does it typically take to repair OBDII code P0735 in a BMW due to Gear 5 Incorrect ratio?
- The repair time can vary based on the exact cause of the issue and the extent of the repairs needed. It may take anywhere from a few hours to a day or more to address the problem fully.
10. Will OBDII code P0735 in a BMW cause the vehicle to fail an emissions test?
- Yes, unresolved transmission issues indicated by P0735 may affect the vehicle's performance during an emissions test, potentially leading to a failed inspection.
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