P0689
ECM/PCM Power Relay Sense Circuit Low
P0689 is an OBD-II diagnostic trouble code meaning: ECM/PCM Power Relay Sense Circuit Low. Common causes: control circuit wire short circuit to ground, broken or damaged wiring. Estimated repair cost: $6–111.
Symptoms
- Check Engine Light
- Unstable engine operation
- Malfunctions of electronic systems
- Possible spontaneous engine shutdown
- Incorrect on-board diagnostic readings
Causes
- Control circuit wire short circuit to ground
- Broken or damaged wiring
- ECU power relay malfunction
- Oxidation or damage to connectors
- Internal ECU fault
How to Fix
- Read OBD-II codes and record all errors
- Locate the control circuit of the ECU power relay according to the diagram
- Measure the voltage in the control circuit
- Check the wire for short to ground
- Check relay and connector
- If the circuit is working properly - ECU diagnostics
Related codes
Error P0689 by Vehicle Brand
FAQ
What does the P0689 code mean?
P0689 is an OBD-II diagnostic trouble code that indicates: ECM/PCM Power Relay Sense Circuit Low
What causes a P0689 error code?
The most common causes of P0689 include: Control circuit wire short circuit to ground; Broken or damaged wiring; ECU power relay malfunction; Oxidation or damage to connectors.
How do I fix a P0689 diagnostic trouble code?
To fix P0689: Read OBD-II codes and record all errors. Locate the control circuit of the ECU power relay according to the diagram. Measure the voltage in the control circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0689?
Do not drive — repair immediately
How much does it cost to fix P0689?
The estimated repair cost for P0689 is $6–111. Actual cost depends on your vehicle, location, and labor rates.
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