P0690
ECM/PCM Power Relay Sense Circuit High
P0690 is an OBD-II diagnostic trouble code meaning: ECM/PCM Power Relay Sense Circuit High. Common causes: short circuit of the control wire to power (+12 v), open circuit in the control circuit. Estimated repair cost: $6–111.
Symptoms
- Check Engine Light
- Unstable operation of electronic systems
- Incorrect data on the state of the power relay in diagnostics
- Possible slow battery drain
- Computer malfunctions
Causes
- Short circuit of the control wire to power (+12 V)
- Open circuit in the control circuit
- ECU power relay malfunction
- Damage to wiring or 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 power (+12 V)
- Check the ground circuit for open circuit
- Check relay; if in good condition - ECU diagnostics
Related codes
Error P0690 by Vehicle Brand
FAQ
What does the P0690 code mean?
P0690 is an OBD-II diagnostic trouble code that indicates: ECM/PCM Power Relay Sense Circuit High
What causes a P0690 error code?
The most common causes of P0690 include: Short circuit of the control wire to power (+12 V); Open circuit in the control circuit; ECU power relay malfunction; Damage to wiring or connectors.
How do I fix a P0690 diagnostic trouble code?
To fix P0690: 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 P0690?
Do not drive — repair immediately
How much does it cost to fix P0690?
The estimated repair cost for P0690 is $6–111. Actual cost depends on your vehicle, location, and labor rates.
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