The P0855 code is part of the OBD-II system and indicates a malfunction in the drive switch input circuit. This code is typically associated with the transmission control module (TCM) and highlights an issue with how the vehicle’s overdrive/tow switch is communicating with the engine computer (PCM).
What Does the P0855 Code Mean?
The P0855 code signifies that the drive switch input circuit is reporting a high signal to the TCM. This means that the overdrive/tow switch, which informs the PCM whether the vehicle is towing, is either malfunctioning or sending an implausible signal.
What Causes the P0855 Code?
Several factors can lead to the P0855 code being triggered, including:
- Shift lever assembly failure
- Transmission Control Module (TCM) failure
- Wiring issues related to the drive switch input circuit
What Are the Symptoms of the P0855 Code?
Drivers experiencing the P0855 code may notice several symptoms, such as:
- Transmission shifting issues
- Warning lights on the dashboard
- Reduced engine performance, especially when towing
How Serious Is the P0855 Code?
The severity of the P0855 code is classified as urgent. Ignoring this code can lead to significant malfunctions in the vehicle’s transmission system, which could result in further damage and compromise driver safety.
How to Diagnose the P0855 Code
Diagnosing the P0855 code involves several steps:
- Use an OBD-II scanner to confirm the P0855 code.
- Inspect the drive switch and related wiring for damage or corrosion.
- Check the shift lever assembly for proper function.
- Test the Transmission Control Module (TCM) to ensure it is operating correctly.
Common Repairs for the P0855 Code
Common repairs associated with the P0855 code may include:
- Replacing the faulty drive switch
- Repairing or replacing damaged wiring
- Replacing the Transmission Control Module (TCM) if necessary
How Much Does It Cost to Fix the P0855 Code?
The cost to repair the P0855 code can vary widely based on the specific issue causing the code. Simple repairs like replacing a drive switch may cost between $100 and $200, while more complex repairs involving the TCM could range from $400 to $800.
Can I Fix the P0855 Code Myself?
While some experienced DIY mechanics may be able to address the P0855 code themselves, it is crucial to have a thorough understanding of automotive systems. If you are not confident in your skills, it is advisable to seek professional help to ensure proper diagnosis and repair.
