OBD fault code library
Look up any P or U code to see what it means, what causes it, the parts involved and how it gets fixed.
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Fault codes
P0638
Throttle Actuator Control Range/Performance Bank 1
Generic
Computer Output Circuit
High severity
P0645
Air Conditioning Clutch Relay Circuit Malfunction
Generic
Computer Output Circuit
High severity
P0655
Engine Hot Lamp Output Control Circuit Malfunction
Generic
Computer Output Circuit
High severity
P0660
Intake Manifold Tuning Valve Control Circuit Open Bank 1
Generic
Computer Output Circuit
High severity
P0663
Intake Manifold Tuning Valve Control Circuit Open Bank 2
Generic
Computer Output Circuit
High severity
P0666
PCM/ECM (Engine Control Module) /TCM Internal Temperature Sensor A Circuit
Generic
Computer Output Circuit
High severity
P0668
PCM/ECM (Engine Control Module) /TCM Internal Temperature Sensor Circuit Low
Generic
Computer Output Circuit
High severity
P0683
Glow Plug Module Control To ECM (Engine Control Module) Communication Circuit Fault
Generic
Computer Output Circuit
High severity
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