BMW DTC P0687 – ECM/PCM Power Relay Control Circuit High
DTC P0687 meaning on BMW
DTC P0687 on a BMW indicates a fault with the Engine Control Module (ECM) or Powertrain Control Module (PCM) power relay control circuit. This fault code suggests that the voltage signal from the power relay control circuit is higher than the normal operating range.
BMW DTC P0687 symptoms
Symptoms of DTC P0687 on a BMW may include:
- Engine stalling or not starting
- Check Engine Light (CEL) illuminated on the dashboard
- Reduced engine performance
- Difficulty in accelerating
BMW DTC P0687 causes
The common causes of DTC P0687 on a BMW include:
- Defective ECM/PCM power relay
- Wiring issues in the power relay control circuit
- Corrosion or poor connections in the relay circuit
- Faulty ECM/PCM
BMW DTC P0687 seriousness
DTC P0687 should be addressed promptly as it can lead to engine performance issues and potential stalling. Ignoring this fault code may result in further damage to the vehicle’s ECM/PCM or other components.
How to diagnose DTC P0687 on BMW
To diagnose DTC P0687 on a BMW, follow these steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the power relay and its connections for any visible damage or corrosion
- Check the wiring harness for any signs of wear or damage
- Perform a voltage test on the power relay control circuit to determine if it is within specifications
How to fix DTC P0687 on BMW
To fix DTC P0687 on a BMW, consider the following:
- Replace the ECM/PCM power relay if it is found to be faulty
- Repair any damaged wiring or connections in the power relay control circuit
- Clean any corrosion from the relay circuit and ensure proper connections
- If the ECM/PCM is faulty, it may need to be replaced or reprogrammed
How to erase DTC P0687 on BMW
To erase DTC P0687 on a BMW, use a diagnostic scanner to clear the fault code from the vehicle’s ECM/PCM memory. After fixing the underlying issue, clearing the code will reset the Check Engine Light and ensure proper operation of the vehicle.
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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