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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1249 (Anti-Lock Brake System) >> Diagnostic Information and Procedures >> DTC C0235: Rear Wheel Speed Signal Circuit Open; C0236: Rear Wheel Speed Signal Circuit Missing; C0237: Rear Wheel Speed Signal Erratic; P1504: Vehicle Speed Output Circuit >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

The number(s) below refer to the step number(s) on the diagnostic table.

  1. 2. If the instrument panel tachometer is working properly, the cause of the malfunction is most likely between the PCM and the EBCM, or the EBCM itself.
  2. 9. At this point, the PCM is likely causing the malfunction. Refer to the OBD system check.
    Fig 1: DTC C0235-C0237 Or P1504 (1 Of 2)
    G01673679Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC C0235-C0237 Or P1504 (2 Of 2)
G01673680Courtesy of GENERAL MOTORS CORP.
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