Control Module Internal Temperature Sensor A Range or Performance
Same as P0666 with the signal in plausible range yet not matching the engine bay environment.
Affected components
- Ecu internal temperature sensor a
Common causes
- High likelihood: Sensor element drifted
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
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.