Powertrain Codes

P0646

Technical Definition:

Air Conditioning (A/C) Clutch Relay Control Circuit Low

Trouble Code: P0646
Address: 0x0646
System: Powertrain
Subsystem: Computer and Auxiliary Output Circuits
Technical Description:

Possible Causes:

Possible Symptoms:

Air Conditioning Clutch Relay Circuit Low

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Air Conditioning Clutch Relay
– Air Conditioning Clutch Relay harness is open or shorted
– Air Conditioning Clutch Relay circuit poor electrical connection

Specific Makes:

P0647

Technical Definition:

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

Trouble Code: P0647
Address: 0x0647
System: Powertrain
Subsystem: Computer and Auxiliary Output Circuits
Technical Description:

Possible Causes:

Possible Symptoms:

Air Conditioning Clutch Relay Circuit High

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Air Conditioning Clutch Relay
– Air Conditioning Clutch Relay harness is open or shorted
– Air Conditioning Clutch Relay circuit poor electrical connection

Specific Makes:

P0644

Technical Definition:

Driver Display Serial Communication Circuit

Trouble Code: P0644
Address: 0x0644
System: Powertrain
Subsystem: Computer and Auxiliary Output Circuits
Technical Description:

Possible Causes:

Possible Symptoms:

Driver Display Serial Communication Circuit

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

P0645

Technical Definition:

Air Conditioning (A/C) Clutch Relay Control Circuit

Trouble Code: P0645
Address: 0x0645
System: Powertrain
Subsystem: Computer and Auxiliary Output Circuits
Technical Description:

Possible Causes:

Possible Symptoms:

Air Conditioning Clutch Relay Circuit Malfunction

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Air Conditioning Clutch Relay
– Air Conditioning Clutch Relay harness is open or shorted
– Air Conditioning Clutch Relay circuit poor electrical connection

Specific Makes:

P0640

Technical Definition:

Intake Air Heater Control Circuit

Trouble Code: P0640
Address: 0x0640
System: Powertrain
Subsystem: Computer and Auxiliary Output Circuits
Technical Description:

Possible Causes:

Possible Symptoms:

Manifold Intake Air Heater

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Intake Air Heater
– Intake Air Heater harness is open or shorted
– Intake Air Heater circuit poor electrical connection

Specific Makes:

P0638

Technical Definition:

Throttle Actuator Control Range / Performance (Bank 1)

Trouble Code: P0638
Address: 0x0638
System: Powertrain
Subsystem: Computer and Auxiliary Output Circuits
Technical Description:

Possible Causes:

Possible Symptoms:

Throttle Actuator Control Range/Performance Bank 1

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Drive-by-wire control system malfunction
– Throttle actuator malfunction
– Throttle valve malfunction
– PCM malfunction

Specific Makes:

P0639

Technical Definition:

Throttle Actuator Control Range / Performance (Bank 2)

Trouble Code: P0639
Address: 0x0639
System: Powertrain
Subsystem: Computer and Auxiliary Output Circuits
Technical Description:

Possible Causes:

Possible Symptoms:

Throttle Actuator Control Range/Performance Bank 2

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes: