BMW DTC P0804 – Upshift/Skip Shift Lamp Control Circuit
DTC P0804 meaning on BMW
DTC P0804 on a BMW refers to the Upshift/Skip Shift Lamp Control Circuit. This diagnostic trouble code indicates an issue with the circuit responsible for controlling the upshift or skip shift indicator lamp on the vehicle.
BMW DTC P0804 symptoms
Symptoms of BMW DTC P0804 may include:
- Malfunctioning upshift or skip shift indicator lamp
- Check Engine Light (CEL) illuminated on the dashboard
- Transmission shifting issues
BMW DTC P0804 causes
Common causes of BMW DTC P0804 include:
- Faulty upshift/skip shift lamp control circuit
- Defective lamp control module
- Wiring or connector issues in the circuit
BMW DTC P0804 seriousness
While DTC P0804 may not directly affect the drivability of the vehicle, it is still important to address this issue to ensure proper functioning of the upshift/skip shift indicator system and to prevent potential transmission problems.
How to diagnose DTC P0804 on BMW
To diagnose DTC P0804 on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault code
- Inspect the upshift/skip shift indicator lamp and its control circuit for any visible damage
- Check the wiring and connectors for continuity and proper connections
- Test the lamp control module for proper operation
How to fix DTC P0804 on BMW
To fix DTC P0804 on a BMW, the following steps may be taken:
- Repair or replace any damaged wiring or connectors in the upshift/skip shift lamp control circuit
- Replace the faulty lamp control module, if necessary
- Clear the fault code and reset the system
How to erase DTC P0804 on BMW
To erase DTC P0804 on a BMW, the fault code can be cleared using a diagnostic scanner or by disconnecting the vehicle’s battery for a few minutes. After the repair has been made, the system should be rechecked to ensure the fault code does not return.
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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