Test Description

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

1. 2. This step determines if DTC P0216 is a hard failure or an intermittent.
2. 4. This step checks for an open or short in the injection timing coil circuit 1.
3. 5. This step checks for an open or short in the injection timing coil circuit 2.
4. 6. The important thing in this step is that the PCM is sending a varying voltage (voltage may vary between 1-12. Usually you will see the voltage vary between 5-6 when the engine is idling), this will indicate that the PCM is OK and that there is a problem with the injection timing stepper motor. If there is a steady voltage present on any circuit, there is a short to voltage or internal PCM problem.

Fig 1: DTC P0216 (Steps 1-9)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC P0216 (Steps 10-18)

Courtesy of GENERAL MOTORS CORP.