Test Description

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

1. 2. This step will determine if DTC P0237 is the result of a hard failure or an intermittent condition.
2. 3. This step simulates conditions for a DTC P0237. If the PCM recognizes the change, the PCM and signal circuit are OK.
3. 9. In this step, components that share the 5-volt reference can cause the reference voltage to be shorted to ground. This can be checked by disconnecting each component that shares the 5-volt reference one at a time, including the PCM, while checking for continuity on that circuit to chassis ground.

Fig 1: DTC P0237 (Steps 1-3)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC P0237 (Steps 4-14)

Courtesy of GENERAL MOTORS CORP.