Diagnostic Aids

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.

The motor temperature sensor can be damaged by excessive electric current. Test the sensor for an open condition whenever a short to voltage condition is observed.
Test the X176 transmission 24-way connector for proper terminal contact whenever an open or high resistance circuit condition is observed.
The HPCM motor temperature scan tool parameter display will default to 120°C (248°F) whenever an open or shorted signal circuit is observed.