Category: Chevrolet

P0651 Chevrolet Sensor Reference Voltage B Circuit Fault

P0651 Chevrolet Sensor Reference Voltage B Circuit Fault Possible causes – Faulty Engine Control Module (ECM)– ECM harness is open or shorted– ECM circuit poor electrical connection– Shorted sensor on 5 volt circuit What about the obd code? The Engine Control Module (ECM) has detected the sensor 5 volt reference circuit voltage is higher or…

P0652 Chevrolet Sensor Reference Voltage B Circuit Low

P0652 Chevrolet Sensor Reference Voltage B Circuit Low Possible causes – Faulty Engine Control Module (ECM)– ECM harness is open or shorted– ECM circuit poor electrical connection– Shorted sensor on 5 volt circuit What about the obd code? The Engine Control Module (ECM) has detected the sensor 5 volt reference circuit voltage is lower than…

P0647 Chevrolet Air Conditioning Clutch Relay Circuit High

P0647 Chevrolet Air Conditioning Clutch Relay Circuit High Possible causes – Faulty Air Conditioning Clutch Relay– Air Conditioning Clutch Relay harness is open or shorted– Air Conditioning Clutch Relay circuit poor electrical connection What about the obd code? Code P0647 Chevrolet may be stored if an open or short exists in A/C clutch relay control…

P0650 Chevrolet Malfunction Indicator Lamp Control Circuit Malfunction

P0650 Chevrolet Malfunction Indicator Lamp Control Circuit Malfunction Possible causes – Faulty Malfunction Indicator Lamp Bulb– Malfunction Indicator Lamp Bulb harness is open or shorted– Malfunction Indicator Lamp Bulb circuit poor electrical connection– Faulty Engine Control Module (ECM) What about the obd code? – An excessively high voltage is sent to Engine Control Module (ECM)…

P0642 Chevrolet Sensor Voltage Circuit A Low Voltage

P0642 Chevrolet Sensor Voltage Circuit A Low Voltage Possible causes – Faulty Engine Control Module (ECM)– ECM harness is open or shorted– ECM circuit poor electrical connection– Shorted sensor on 5 volt circuit Tech description There is a factory service bulletin for the P0642 Chevrolet code for the following models: 2005-2007 Audi A32005-2007 Audi A42007…

P0643 Chevrolet Sensor Reference Voltage A Circuit High

P0643 Chevrolet Sensor Reference Voltage A Circuit High Possible causes – Faulty Engine Control Module (ECM)– ECM harness is open or shorted– ECM circuit poor electrical connection– Shorted sensor on 5 volt circuit What about the obd code? The Engine Control Module (ECM) has detected the sensor 5 volt reference circuit voltage is higher than…

P0645 Chevrolet Air Conditioning Clutch Relay Circuit Malfunction

P0645 Chevrolet Air Conditioning Clutch Relay Circuit Malfunction Possible causes – Faulty Air Conditioning Clutch Relay– Air Conditioning Clutch Relay harness is open or shorted– Air Conditioning Clutch Relay circuit poor electrical connection What about the obd code? The P0645 Chevrolet code is stored if an open or short exists in A/C clutch relay control…

P0646 Chevrolet Air Conditioning Clutch Relay Circuit Low

P0646 Chevrolet Air Conditioning Clutch Relay Circuit Low Possible causes – Faulty Air Conditioning Clutch Relay– Air Conditioning Clutch Relay harness is open or shorted– Air Conditioning Clutch Relay circuit poor electrical connection What about the obd code? Code P0646 Chevrolet may be stored if an open or short exists in A/C clutch relay control…

P063D Chevrolet Generator Voltage Sensor Circuit High

P063D Chevrolet Generator Voltage Sensor Circuit High OBD Code: System: Subsystem:  P063D Chevrolet – (ASE)  Powertrain  Computer and Auxiliary Output Circuits Trouble Code Description: Generator Voltage Sensor Circuit High Location: Analysis: Possible Causes:    End of Range – Circuit Higher Than Expected   Tech description:

P063E Chevrolet Auto Configuration Throttle Input Not Present

P063E Chevrolet Auto Configuration Throttle Input Not Present OBD Code: System: Subsystem:  P063E Chevrolet – (ASE)  Powertrain  Computer and Auxiliary Output Circuits Trouble Code Description: Auto Configuration Throttle Input Not Present Location: Analysis: Possible Causes:       Tech description:

P0640 Chevrolet Manifold Intake Air Heater

P0640 Chevrolet Manifold Intake Air Heater Possible causes – Faulty Intake Air Heater– Intake Air Heater harness is open or shorted– Intake Air Heater circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0640 Chevrolet Description The intake air (IA) heater is located in the air inlet tube and…

P0641 Chevrolet 5 Volt Reference Voltage Incorrect

P0641 Chevrolet 5 Volt Reference Voltage Incorrect Possible causes – Faulty Engine Control Module (ECM)– ECM harness is open or shorted– ECM circuit poor electrical connection– Shorted sensor on 5 volt circuit What about the obd code? The Engine Control Module (ECM) has detected the sensor 5 volt reference circuit voltage is higher or lower…

P0639 Chevrolet Throttle Actuator Control Range/Performance

P0639 Chevrolet Throttle Actuator Control Range/Performance Possible causes – Drive-by-wire control system malfunction– Throttle actuator malfunction– Throttle valve malfunction– PCM malfunction Tech description Dirty or clogged throttle body can triggered the P0639 Chevrolet code. Before replacing any parts try cleaning the throttle body and reset the engine light. Symptoms – Engine Light ON (or Service…

P063A Chevrolet Generator Voltage Sensore Circuit

P063A Chevrolet Generator Voltage Sensore Circuit OBD Code: System: Subsystem:  P063A Chevrolet – (ASE)  Powertrain  Computer and Auxiliary Output Circuits Trouble Code Description: Generator Voltage Sensore Circuit Location: Analysis: Possible Causes:    Circuit Issue   Tech description:

P063B Chevrolet Generator Voltage Sensore Circuit Range / Performance

P063B Chevrolet Generator Voltage Sensore Circuit Range / Performance OBD Code: System: Subsystem:  P063B Chevrolet – (ASE)  Powertrain  Computer and Auxiliary Output Circuits Trouble Code Description: Generator Voltage Sensore Circuit Range / Performance Location: Analysis: Possible Causes:    Out of Expected Range   Tech description: