BMW DTC P104B – Camshaft Position Timing Pressure Accumulator Shutoff Valve Control Circuit High
DTC P104B meaning on BMW
The DTC P104B code on a BMW indicates an issue with the Camshaft Position Timing Pressure Accumulator Shutoff Valve Control Circuit being too high. This means that there is a fault in the control circuit that manages the pressure accumulator shutoff valve related to the camshaft position timing.
BMW DTC P104B symptoms
Symptoms of the DTC P104B code on a BMW may include rough engine operation, reduced engine performance, engine misfires, and potentially stalling. The Check Engine Light may also illuminate on the dashboard.
BMW DTC P104B causes
The common causes of the DTC P104B code on a BMW include a faulty camshaft position timing pressure accumulator shutoff valve, wiring issues in the control circuit, or a malfunction in the engine control module (ECM).
BMW DTC P104B seriousness
Ignoring the DTC P104B code on a BMW can lead to poor engine performance, potential damage to engine components, and increased fuel consumption. It is important to address this issue promptly to prevent further damage.
How to diagnose DTC P104B on BMW
To diagnose the DTC P104B code on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s ECM. They would then inspect the camshaft position timing pressure accumulator shutoff valve, check the wiring for any damage, and test the control circuit for proper operation.
How to fix DTC P104B on BMW
Fixing the DTC P104B code on a BMW may involve replacing the camshaft position timing pressure accumulator shutoff valve if it is found to be faulty. Additionally, repairing any damaged wiring in the control circuit and ensuring proper connections can help resolve the issue. In some cases, reprogramming or replacing the ECM may be necessary.
How to erase DTC P104B on BMW
Once the underlying issue causing the DTC P104B code on a BMW has been fixed, the code can be erased using a diagnostic scanner. The scanner can clear the fault codes stored in the ECM, and the Check Engine Light should turn off once the code has been successfully erased.
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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