BMW DTC P0735 – Gear 5 Incorrect Ratio
DTC P0735 meaning on BMW
DTC P0735 in a BMW indicates that the transmission control module has detected an incorrect gear ratio in the fifth gear. This means that the transmission is not shifting properly into the correct gear, leading to potential drivability issues and poor performance.
BMW DTC P0735 symptoms
Symptoms of DTC P0735 in a BMW may include harsh shifting, slipping gears, delayed engagement when shifting into fifth gear, decreased fuel efficiency, and the transmission may go into limp mode to prevent further damage.
BMW DTC P0735 causes
The most common causes of DTC P0735 in a BMW include low transmission fluid levels, dirty or contaminated transmission fluid, a faulty transmission solenoid, a worn clutch or gear, a malfunctioning transmission control module, or mechanical issues within the transmission itself.
BMW DTC P0735 seriousness
Ignoring DTC P0735 in a BMW can lead to further damage to the transmission and potentially result in a complete transmission failure. It is important to address this issue promptly to prevent costly repairs and ensure the safety and drivability of the vehicle.
How to diagnose DTC P0735 on BMW
To diagnose DTC P0735 on a BMW, a mechanic will typically perform a thorough inspection of the transmission system, check the transmission fluid level and condition, conduct a scan of the transmission control module for fault codes, and perform a road test to observe the shifting behavior.
- Check transmission fluid level and condition
- Scan transmission control module for fault codes
- Inspect transmission solenoids and sensors
- Perform a road test to observe shifting behavior
How to fix DTC P0735 on BMW
Fixing DTC P0735 on a BMW may involve various steps depending on the underlying cause. Common solutions include topping up or replacing the transmission fluid, cleaning or replacing the transmission solenoid, repairing or replacing damaged gears or clutches, resetting the transmission control module, or performing a transmission rebuild or replacement if necessary.
How to erase DTC P0735 on BMW
To erase DTC P0735 on a BMW, a mechanic can use a diagnostic scanner to clear the fault code from the transmission control module’s memory. After addressing the underlying issue that caused the fault code, the mechanic can then reset the code to ensure that the transmission is functioning properly.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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