P0669
PowertrainPcm Internalmoderate severityPCM/ECM/TCM Internal Temperature Sensor Circuit High
What P0669 Means
The PCM detected a high voltage signal from the internal module temperature sensor. This sensor tracks the control module's operating temperature.
Symptoms
- Check engine light on
- Possible performance issues
- No obvious drivability symptoms
Common Causes
- Faulty internal temperature sensor
- Internal circuit fault
- Overheated control module
- Faulty PCM
Diagnostic Steps
- Scan for codes
- Verify sensor data with scan tool
- Check module for heat exposure
- Replace PCM if internal fault confirmed
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