Possible causes – Engine Control Module (ECM) Harness power supply circuit is open or shorted– Engine Control Module (ECM) Programming– Faulty Engine Control Module (ECM) Tech notes Check the PCM fuse, if fuse is OK try erasing the code first

Possible causes – Engine mechanical problems– Incorrect timing chain– Stretched timing chain– Failed camshaft actuator or actuator solenoid Tech notes There is a factory service bulletin for the following GMC models: 2007-2008 GMC AcadiaThe service bulletin suggest replacing the primary

Possible causes – Engine mechanical problems– Incorrect timing chain– Stretched timing chain– Failed camshaft actuator or actuator solenoid Tech notes There is a factory service bulletin for the following GMC models: 2007-2008 GMC Acadia The service bulletin suggest replacing the

Possible causes – Faulty Air Pump inoperative– Air bypass solenoid harness is open or shorted– Air bypass solenoid circuit poor electrical connection When is the code detected? If the fault detection circuit senses a voltage other than what is expected,

Possible causes – Faulty Air Pump inoperative– Air bypass solenoid harness is open or shorted– Air bypass solenoid circuit poor electrical connection When is the code detected? If the fault detection circuit senses a voltage other than what the Powertrain

Possible causes – Faulty Brake Switch– Brake Switch harness is open or shorted– Brake Switch circuit poor electrical connection When is the code detected? When the Powertrain Control Module (PCM) detects an open brake switch circuit (0 volts, low input)

Possible causes – Faulty Brake Switch– Brake Switch harness is open or shorted– Brake Switch circuit poor electrical connection– Misadjusted Brake Switch When is the code detected? The stop light switch does not turn off even once vehicle is driven.

Possible causes – Faulty Camshaft Position Sensor– Camshaft Position Sensor harness is open or shorted– Camshaft Position Sensor circuit poor electrical connection– Faulty starter motor– Starting system circuit– Dead (Weak) battery Tech notes On some GMC models the camshaft position

Possible causes – Faulty Camshaft Position Sensor– Camshaft Position Sensor harness is open or shorted– Camshaft Position Sensor circuit poor electrical connection– Faulty starter motor– Starting system circuit– Dead (Weak) battery Tech notes On some GMC models the camshaft position

Possible causes – Faulty Camshaft Position Sensor– Camshaft Position Sensor harness is open or shorted– Camshaft Position Sensor circuit poor electrical connection– Faulty starter motor– Starting system circuit– Dead (Weak) battery Tech notes Sometimes and in some models, low battery

Possible causes – Faulty Camshaft Position Sensor– Camshaft Position Sensor harness is open or shorted– Camshaft Position Sensor circuit poor electrical connection– Faulty starter motor– Starting system circuit– Dead (Weak) battery Tech notes Sometimes and in some models, low battery

Possible causes – Faulty Clutch Switch– Misadjusted Clutch Switch– Clutch Switch harness is open or shorted– Clutch Switch circuit poor electrical connection– Faulty Engine Control Module (ECM) Tech notes Check clutch switch adjustment, the switch should open and close when

Possible causes – Faulty crankshaft position sensor– Crankshaft position sensor harness is open or shorted– Crankshaft position sensor circuit poor electrical connection When is the code detected? The Powertrain Control Module (PCM) determines no signal from the Crankshaft Position (CKP)

Possible causes – Faulty crankshaft position sensor– Crankshaft position sensor harness is open or shorted– Crankshaft position sensor circuit poor electrical connection– Signal plate may be damage– Starter motor may be faulty– Starting system circuit– Dead or weak battery When

Possible causes – Faulty cylinder #1 glow plug– Cylinder #1 glow plug harness is open or shroted– Cylinder #1 glow plug circuit poor electrical connection– Faulty glow plug module When is the code detected? The Engine Control Module (ECM) has

Possible causes – Faulty cylinder #2 glow plug– Cylinder #2 glow plug harness is open or shroted– Cylinder #2 glow plug circuit poor electrical connection– Faulty glow plug module When is the code detected? The Engine Control Module (ECM) has

Possible causes – Faulty cylinder #3 glow plug– Cylinder #3 glow plug harness is open or shroted– Cylinder #3 glow plug circuit poor electrical connection– Faulty glow plug module When is the code detected? The Engine Control Module (ECM) has

Possible causes – Faulty cylinder #4 glow plug– Cylinder #4 glow plug harness is open or shroted– Cylinder #4 glow plug circuit poor electrical connection– Faulty glow plug module When is the code detected? The Engine Control Module (ECM) has

Possible causes – Faulty cylinder #5 glow plug– Cylinder #5 glow plug harness is open or shroted– Cylinder #5 glow plug circuit poor electrical connection– Faulty glow plug module When is the code detected? The Engine Control Module (ECM) has

Possible causes – Faulty cylinder #6 glow plug– Cylinder #6 glow plug harness is open or shroted– Cylinder #6 glow plug circuit poor electrical connection– Faulty glow plug module When is the code detected? The Engine Control Module (ECM) has