BMW DTC P0878 – Transmission Fluid Pressure Sensor/Switch ‘D’ Circuit High
DTC P0878 meaning on BMW
The Diagnostic Trouble Code (DTC) P0878 for BMW indicates a malfunction in the Transmission Fluid Pressure Sensor/Switch ‘D’ Circuit, where the signal voltage is detected to be higher than the expected range.
BMW DTC P0878 symptoms
Symptoms of DTC P0878 on a BMW may include:
- Harsh shifting
- Transmission slipping
- Transmission overheating
- Transmission warning light illuminated on the dashboard
BMW DTC P0878 causes
Common causes of DTC P0878 on a BMW include:
- Defective transmission fluid pressure sensor/switch
- Wiring or connector issues in the transmission fluid pressure sensor circuit
- Low transmission fluid level or dirty transmission fluid
- Internal transmission problems
BMW DTC P0878 seriousness
Ignoring DTC P0878 on a BMW can lead to further transmission damage and potential safety hazards. It is important to address this issue promptly to prevent more severe transmission problems.
How to diagnose DTC P0878 on BMW
To diagnose DTC P0878 on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the transmission fluid pressure sensor/switch and its wiring for any visible damage
- Check the transmission fluid level and condition
- Perform a thorough transmission system inspection for any other related issues
How to fix DTC P0878 on BMW
To fix DTC P0878 on a BMW, the following steps may be taken:
- Replace the faulty transmission fluid pressure sensor/switch
- Repair or replace any damaged wiring or connectors in the sensor circuit
- Ensure the transmission fluid is at the correct level and in good condition
- If internal transmission problems are found, further diagnostics and repairs may be necessary
How to erase DTC P0878 on BMW
After fixing the underlying issue causing DTC P0878 on a BMW, the fault codes can be erased using a diagnostic scanner. This will clear the code from the vehicle’s memory and turn off the transmission warning light.
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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