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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 942 (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 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. 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:

  1. 3.  This step tests for a voltage signal from the PCM.
  2. 4.  This step tests for a missing or erratic vehicle speed signal from the PCM. An assistant may be required to perform this test.
Fig 1: DTC C0235-C0237 Or P1504 Table
G01706126Courtesy of GENERAL MOTORS CORP.
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