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Home >> GMC >> 2002 >> C3500 HD 8.1 G, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 8.1L >> Diagnostic Information and Procedures >> DTC P0650 >> Test Description

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 2. Command both the ON and the OFF states. Repeat the commands as necessary.
  2. 8. If you do not find trouble in the control circuit or the connection at the PCM, the PCM may be faulty. However, this is an extremely unlikely failure.
Fig 1: DTC P0650
G01599074Courtesy of GENERAL MOTORS CORP.
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