ECM/PCM Power Relay Sense Circuit High
ECM/PCM Power Relay Sense Circuit High: the signal voltage is above the expected range. Often an open circuit or a short to supply voltage.
Affected components
- Ecm
- Main relay
Common causes
- High likelihood: Main relay contacts stuck closed
- Medium likelihood: Sense wire shorted to power
- Low likelihood: Connector pins corroded - high contact resistance
Possible symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.