Test Description
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic table.
- 2) - Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
- 5) - Tests for an open in the passlock sensor signal circuit which may not set a DTC B2958 under certain conditions.
- 6) - The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
- 7) - The presence of DTC P0601, P0602, P0604, or P0606 indicates an internal fault in the PCM.
- 8) - The presence of DTC B1000 indicates an internal module fault.
- 9) - The Presence of DTC P1637, P1638, P0562 or P0563 indicates a low or high voltage condition.