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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 217 (Antilock Brake System) >> Diagnostic Information and Procedures >> DTC C0055 Or P0609: Vehicle Speed Signal >> Test Description

Test Description

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

  1. This step tests for a voltage signal from the PCM.
  2. 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 C0055 or P0609 (1 Of 2)
G01216194Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC C0055 or P0609 (2 Of 2)
G01216195Courtesy of GENERAL MOTORS CORP.
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