Possible causes – Timing belt or chain stretched or jumped– Faulty Camshaft Position (CMP) Sensor – Camshaft Position (CMP) Sensor harness is open or shorted– Camshaft Position (CMP) Sensor circuit poor electrical connection. Symptoms – Engine Light ON (or Service
Possible causes – Timing belt or chain stretched or jumped– Faulty Camshaft Position (CMP) Sensor – Camshaft Position (CMP) Sensor harness is open or shorted– Camshaft Position (CMP) Sensor circuit poor electrical connection. Symptoms – Engine Light ON (or Service
Possible causes – Timing belt or chain stretched or jumped– Faulty Camshaft Position (CMP) Sensor – Camshaft Position (CMP) Sensor harness is open or shorted– Camshaft Position (CMP) Sensor circuit poor electrical connection. Symptoms – Engine Light ON (or Service
Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1391 Information for specific makes P1391 BUICKP1391 CADILLACP1391 CHEVROLETP1391 DODGEP1391 FORDP1391 GMCP1391 CHRYSLERP1391 JEEP
P1391 CHEVROLET – Wheel Speed Sensor 1 – G – Sensor Circuit Performance
P1391 FORD – Glow Plug Circuit Low Input Bank #1
P1391 GMC – Wheel Speed Sensor 1 – G – Sensor Circuit Performance
P1391 BUICK – Wheel Speed Sensor 1, G-Sensor Circuit Performance
P1391 CADILLAC – Wheel Speed Sensor 1, G-Sensor Circuit Performance