BMW DTC P0855 – Drive Switch Input Circuit High
DTC P0855 meaning on BMW
DTC P0855 on a BMW refers to the Drive Switch Input Circuit High. This diagnostic trouble code indicates that the powertrain control module (PCM) has detected a high voltage signal from the drive switch input circuit.
BMW DTC P0855 symptoms
Symptoms of DTC P0855 on a BMW may include:
- Difficulty shifting gears
- Transmission not responding to gear changes
- Check Engine Light (CEL) illuminated on the dashboard
BMW DTC P0855 causes
The potential causes of DTC P0855 on a BMW include:
- Faulty drive switch
- Short circuit in the drive switch input circuit
- Open circuit in the drive switch input circuit
- Issues with the wiring or connectors related to the drive switch
BMW DTC P0855 seriousness
While DTC P0855 may not always result in immediate drivability issues, it is important to address this code promptly to prevent potential transmission problems and ensure the vehicle operates correctly.
How to diagnose DTC P0855 on BMW
To diagnose DTC P0855 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the PCM.
- Inspect the drive switch and its wiring for any visible damage or corrosion.
- Check the voltage levels at the drive switch input circuit using a multimeter.
- Perform a continuity test on the wiring to ensure there are no open circuits.
How to fix DTC P0855 on BMW
To fix DTC P0855 on a BMW, you can try the following:
- Replace the faulty drive switch if it is determined to be the cause of the high voltage signal.
- Repair any damaged wiring or connectors in the drive switch input circuit.
- Clear the fault codes using a diagnostic scanner after making the necessary repairs.
How to erase DTC P0855 on BMW
To erase DTC P0855 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the PCM. Once the repairs have been made to address the underlying issue causing the high voltage signal, clearing the DTC will reset the Check Engine Light and ensure the system 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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