Error code
OBD2 P0689
OBD2P0689
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
ECM/PCM Power Relay Sense Circuit Low.
Severity
moderateCan drive, but may experience engine performance issues or stalling.
Summary
P0689 indicates a low voltage issue in the ECM/PCM power relay sense circuit, which is part of the engine control module's power supply system.
Common Causes
- Wiring short to earth
- ECM/PCM power relay failure
- Fault within the ECM
Fixes
- Replace faulty power relay or repair wiring issue.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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- P0606ECM/PCM Processor
- P0607Control Module Performance
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