Test Description

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

3. This step tests for a voltage signal from the PCM.

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

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC C0235-C0237 or P1504

Courtesy of GENERAL MOTORS CORP.