P0668 Fault Code
P0668 OBD-II Trouble Code Short Description
PCM / ECM / TCM Internal Temperature Sensor Circuit Low
What does trouble code P0668 mean?
The P0668 fault code refers to a problem with the Internal Temperature Sensor Circuit of the Powertrain Control Module (PCM), Engine Control Module (ECM), or Transmission Control Module (TCM). This error indicates that the temperature sensor is reporting a lower voltage than the expected range. This issue can affect the performance of the engine and transmission systems.
Symptoms
What are the symptoms of the P0668 code?
- Check Engine Light illumination
- Erratic engine behavior
- Poor fuel economy
- Transmission shifting issues
- Engine overheating or underheating
- Reduced engine performance
Causes
What causes the P0668 code?
- Faulty internal temperature sensor
- Poor electrical connections or wiring issues
- Faults within the PCM/ECM/TCM itself
- Corrosion in connectors
- Software glitches in the module
Possible Solutions
How to fix P0668?
- Inspect and repair any damaged wiring or connectors associated with the sensor.
- Test the internal temperature sensor and replace it if faulty.
- Reflash or update the PCM/ECM/TCM software if necessary.
- Clear the fault code and conduct a test drive to verify the fix.
- Monitor the engine and transmission performance post-repair.