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
P0669
PCM/ECM (Engine Control Module) /TCM Internal Temperature Sensor Circuit High
Generic
Computer Output Circuit
High severity
P0684
Glow Plug Control Module to ECM (Engine Control Module) Communication Circuit Range/Performance
Generic
Computer Output Circuit
High severity
P0685
Electronic Control Module Power Control Circuit Malfunction
Generic
Computer Output Circuit
High severity
P0688
Electronic Control Module Power Relay Sense Circuit/Open
Generic
Computer Output Circuit
High severity
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