Category: Chevrolet

P1641 Chevrolet FC Relay 1 Control Circuit Possible causes – Faulty Cooling Fan Relay– Cooling Fan Relay harness is open or shorted– Cooling Fan Relay circuit poor electrical component Symptoms – Engine Light ON (or Service Engine Soon Warning Light) – Cooling Fan not working P1641 Chevrolet Description Ignition voltage is supplied to the Cooling…

P1642 Chevrolet FC Relay 2 And 3 Control Circuit Possible causes – Faulty Cooling Fan Relay– Cooling Fan Relay harness is open or shorted– Cooling Fan Relay circuit poor electrical component Symptoms – Engine Light ON (or Service Engine Soon Warning Light) – Cooling Fan not working P1642 Chevrolet Description Ignition voltage is supplied to…

P1643 Chevrolet Engine Speed Output Circuit Possible causes – Reprogram computer – Faulty ECM Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1643 Chevrolet Description There is a communication problem with Control Area Network (CAN) link from the Engine Control Module (ECM)to the Transmission Control Module (TCM)

P1644 Chevrolet Traction Control Delivered Torque Output Circuit Possible causes – Poor connection at the AC motor control module – Open or short circuit condition – Failed AC Motor Control Module What about the obd code? No duty signals are input from the MCM for at least 5 seconds. Symptoms – Engine Light ON (or…

P1638 Chevrolet ECM (Microcontroller) – Malfunction Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1639 Chevrolet PCM 5 Volt Reference Voltage Circuit Condition Possible causes – Sensor using 5 volt reference line shorted to ground– Circuit short to ground What about the obd code? If the voltage is out of tolerance, the PCM will set DTC P1639 Chevrolet. Symptoms – Engine Light ON (or Service Engine Soon Warning Light)…

P1640 Chevrolet Powertrain DTCs Available in Another Module Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1634 Chevrolet Output Link Circuit Failure Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1635 Chevrolet 5 Volt Reference Circuit Possible causes – A/C Pressure sensor harness is open or shorted– MAP sensor harness is open or shorted– EGR valve harness is open or shorted What about the obd code? The P1635 Chevrolet code is set when the reference voltage from the sensor is our of range. Symptoms –…

P1636 Chevrolet Inductive Signature Chip Communication Error Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1637 Chevrolet Can Link ECM/ABSCM Circuit / Net Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1631 Chevrolet Communication Error Between From ECM To VSC Possible causes – Skid Control ECU / Engine Control Module (ECM) harness is open or shorted– Skid Control ECU / Engine Control Module (ECM) circuit poor electrical connection– Faulty Skid Control ECU– Faulty Engine Control Module (ECM) Symptoms – Engine Light ON (or Service Engine Soon…

P1632 Chevrolet Theft Deterrent Start Disable Signal Received Possible causes – Deterrent key not programmed to vheicle– Faulty Deterrent key– Fualty ignition switch– Poor electrical connection for Deterrent circuit components Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– No or hard engine start situation P1632 Chevrolet Description The Engine Control Module (ECM),…

P1633 Chevrolet ECM Malfunction ETCS Circuit Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1630 Chevrolet Communication Error Between From ECM To VSC Possible causes – Skid Control ECU / Engine Control Module (ECM) harness is open or shorted– Skid Control ECU / Engine Control Module (ECM) circuit poor electrical connection– Faulty Skid Control ECU– Faulty Engine Control Module (ECM) Symptoms – Engine Light ON (or Service Engine Soon…

P1626 Chevrolet Theft Deterrent Fuel Enable Signal Not Received/ B+ Supply To VCRM A/C Circuit Malfunction Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1627 Chevrolet Module Supply Voltage Out Of Range Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1628 Chevrolet Module Ignition Supply Input Malfunction Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1629 Chevrolet Theft Deterrent Start Enable Signal Not Received Possible causes – Deterrent key not programmed to vheicle– Faulty Deterrent key– Fualty ignition switch– Poor electrical connection for Deterrent circuit components Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– No or hard engine start situation P1629 Chevrolet Description The Engine Control Module…

P1622 Chevrolet Immobilizer ID Does Not Match Symptoms – Engine Light ON (or Service Engine Soon Warning Light)