Possible causes – Faulty Crankshaft Position (CKP) Sensor– Crankshaft Position (CKP) Sensor harness is open or shorted– Crankshaft Position (CKP) Sensor circuit poor electrical connection– Communication error between the Engine Control Module (ECM) and Transmission Control Module (TCM) When is

Possible causes – Faulty Engine Control Module (ECM)– ECM harness is open or shorted– ECM circuit poor electrical connection– ECM Programming When is the code detected? The Engine Control Module (ECM) has detected a high voltage to the transmission control

Possible causes – Faulty Gear Position Switch– Misadjusted Gear Position Switch– Gear Position Switch harness is open or shorted– Gear Position Switch circuit poor electrical connection When is the code detected? The transmission Gear Position Switch detects the selector lever

Possible causes – Faulty Manifold Absolute Pressure sensor– Manifold Absolute Pressure harness is open or shorted– Manifold Absolute Pressure sensor circuit poor electrical connection– Faulty Engine Control Module (ECM) When is the code detected? An excessively low or high voltage

Possible causes – Faulty mass air flow sensor– Intake air leaks– Dirty mass air flow sensor– Dirty mass air filter– Mass air flow sensor harness is open or shorted– Mass air flow sensor circuit poor electrical connection Tech notes Before

Possible causes – Faulty mass air flow sensor– Intake air leaks– Dirty mass air flow sensor– Dirty mass air filter– Mass air flow sensor harness is open or shorted– Mass air flow sensor circuit poor electrical connection Tech notes Before

Possible causes – Faulty mass air flow sensor– Intake air leaks– Dirty mass air flow sensor– Dirty mass air filter– Mass air flow sensor harness is open or shorted– Mass air flow sensor circuit poor electrical connection Tech notes Before

Possible causes – Faulty mass air flow sensor– Intake air leaks– Dirty mass air flow sensor– Dirty mass air filter– Mass air flow sensor harness is open or shorted– Mass air flow sensor circuit poor electrical connection Tech notes Before

Possible causes – Faulty mass air flow sensor– Intake air leaks– Dirty mass air flow sensor– Dirty mass air filter– Mass air flow sensor harness is open or shorted– Mass air flow sensor circuit poor electrical connection Tech notes Before

Possible causes – Low transmission fluid level– Dirty transmission fluid– Faulty Shift Solenoids– Shift Solenoids harness is open or shorted– Shift Solenoids circuit poot electrical connection– Transmission mechanical problems– Transmission hydraulic control circuit Tech notes Start by inspecting the transmission

Possible causes – Low transmission fluid level– Dirty transmission fluid– Shift solenoids– Transmission mechanical problems– Transmission hydraulic control circuit Tech notes Start by inspecting the transmission fluid level and condition, and change fluid if necessary. When is the code detected?

Possible causes – Low transmission fluid level– Dirty transmission fluid– Shift solenoids– Transmission mechanical problems– Transmission hydraulic control circuit Tech notes Start by inspecting the transmission fluid level and condition, and change fluid if necessary. When is the code detected?

Possible causes – Low transmission fluid level– Dirty transmission fluid– Shift solenoids– Transmission mechanical problems– Transmission hydraulic control circuit Tech notes Start by inspecting the transmission fluid level and condition, and change fluid if necessary. When is the code detected?

Possible causes – Low transmission fluid level– Dirty transmission fluid– Shift solenoids– Transmission mechanical problems– Transmission hydraulic control circuit Tech notes Start by inspecting the transmission fluid level and condition, and change fluid if necessary. When is the code detected?

Possible causes – The vehicle is new from the factory.– Battery or Powertrain Control Module (PCM) had recently been disconnected.– An OBD monitor failure occurred before completion of an OBD drive cycle.– PCM Detected Trouble Codes (DTC) have recently been