Category: OBDii Powertrain Codes

P0653 Sensor Reference Voltage B Circuit High

P0653 Sensor Reference Voltage B 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 expected…

P0654 Engine Speed Output Circuit

P0654 Engine Speed Output Circuit Possible causes – Faulty Instrument Cluster– Instrument Cluster harness is open or shorted– Instrument Cluster circuit poor electrical connection– Faulty PCM What about the obd code? If the fault detection circuit senses a voltage other than what is expected, the fault line status changes causing the P0654 code will set….

P0656 Fuel Level Output Circuit Malfunction

P0656 Fuel Level Output Circuit Malfunction Possible causes – Faulty Fuel Level Gauge– Fuel Level Gauge harness is open or shorted– Fuel Level Gauge circuit poor electrical connection– Faulty Powertrain Control Module (PCM) What about the obd code? If the fault detection circuit senses a voltage other than what the PCM expects, the fault line…

P0645 Air Conditioning Clutch Relay Circuit Malfunction

P0645 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 code is stored if an open or short exists in A/C clutch relay control circuit. Symptoms…

P0646 Air Conditioning Clutch Relay Circuit Low

P0646 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 may be stored if an open or short exists in A/C clutch relay control circuit. Symptoms…

P0647 Air Conditioning (A/C) Clutch Relay Control Circuit High

P0647 Air Conditioning (A/C) Clutch Relay Control Circuit High OBD Code: System: Subsystem:  P0647 – (ASE)  Powertrain  Computer and Auxiliary Output Circuits Trouble Code Description: Air Conditioning (A/C) Clutch Relay Control Circuit High Location: Analysis: Possible Causes:  A/C Clutch Relay  End of Range – Circuit Higher Than Expected   Tech description:

P0647 Air Conditioning Clutch Relay Circuit High

P0647 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 may be stored if an open or short exists in A/C clutch relay control circuit. Symptoms…

P0642 Sensor Voltage Circuit A Low Voltage

P0642 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 code for the following models: 2005-2007 Audi A32005-2007 Audi A42007 Audi A4…

P0643 Sensor Reference Voltage A Circuit High

P0643 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 expected…

P0639 Throttle Actuator Control Range/Performance

P0639 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 code. Before replacing any parts try cleaning the throttle body and reset the engine light. Symptoms – Engine Light ON (or Service Engine Soon…

P063A Generator Voltage Sensore Circuit

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

P063B Generator Voltage Sensore Circuit Range / Performance

P063B Generator Voltage Sensore Circuit Range / Performance OBD Code: System: Subsystem:  P063B – (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:

P063C Generator Voltage Sensore Circuit Low

P063C Generator Voltage Sensore Circuit Low OBD Code: System: Subsystem:  P063C – (ASE)  Powertrain  Computer and Auxiliary Output Circuits Trouble Code Description: Generator Voltage Sensore Circuit Low Location: Analysis: Possible Causes:    End of Range – Circuit Lower Than Expected   Tech description:

P063D Generator Voltage Sensor Circuit High

P063D Generator Voltage Sensor Circuit High OBD Code: System: Subsystem:  P063D – (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 Auto Configuration Throttle Input Not Present

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

P0640 Manifold Intake Air Heater

P0640 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 Description The intake air (IA) heater is located in the air inlet tube and is used…