P0690 – BMW DTC

BMW DTC P0690 – ECM/PCM Power Relay Sense Circuit High

DTC P0690 meaning on BMW

DTC P0690 on a BMW indicates a fault with the ECM/PCM power relay sense circuit. This fault code is triggered when the powertrain control module (PCM) detects a high voltage signal from the power relay sense circuit, indicating a potential issue with the relay or its associated wiring.

BMW DTC P0690 symptoms

Symptoms of DTC P0690 on a BMW may include:

• Check Engine Light (CEL) illuminated on the dashboard
• Engine may run rough or stall
• Reduced engine performance

BMW DTC P0690 causes

Common causes of DTC P0690 on a BMW include:

• Defective ECM/PCM power relay
• Faulty power relay sense circuit wiring
• Corrosion or poor connections in the relay circuit

BMW DTC P0690 seriousness

DTC P0690 should be addressed promptly as it can lead to drivability issues and potential engine damage if left unresolved. Ignoring this fault code may result in poor engine performance and increased fuel consumption.

How to diagnose DTC P0690 on BMW

To diagnose DTC P0690 on a BMW, follow these steps:

1. Use a diagnostic scanner to retrieve the fault code
2. Inspect the power relay and its connections for any visible damage or corrosion
3. Check the power relay sense circuit wiring for continuity and proper connections
4. Test the power relay using a multimeter to ensure it is functioning correctly

How to fix DTC P0690 on BMW

To fix DTC P0690 on a BMW, consider the following steps:

1. Replace the ECM/PCM power relay if it is found to be faulty
2. Repair or replace any damaged wiring in the power relay sense circuit
3. Clean any corrosion from the relay connections and ensure a secure connection
4. Clear the fault code using a diagnostic scanner after completing the repairs

How to erase DTC P0690 on BMW

To erase DTC P0690 on a BMW, follow these steps:

1. Connect a diagnostic scanner to the vehicle’s OBD-II port
2. Access the scanner’s menu to clear the fault codes stored in the PCM
3. Follow the on-screen prompts to erase the DTC P0690 code
4. Verify that the code has been successfully cleared by rescanning 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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