C0633 Diagnostic Trouble Code

C0633 is a kind of OBD-II Diagnostic C-Chassis Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a C0633 diagnostic trouble code may include:

Possible spark knock (detonation / pre-ignition)
Poor fuel economy
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed.

Process Tips

Diagnostic trouble code C0633 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before C0633.

Fortunately, C0633 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0633 Trouble Code For Specific Cars

C0633 Volkswagen 1600 Rear Doppler Sensor Circuit Failure
C0633 Alldays 30 Air Bag Memory Clear Circuit Failure
C0633 Nissan 180 Child Seat Detection Circuit Short to Ground
C0633 Oldsmobile Silhouette Damper LF Circuit Open
C0633 Adams 35 ABS Inlet Valve Coil RF Circuit Failure
C0633 Ferrari F550 Intrusion Sensor Fault
C0633 Honda Passport Rear Cargo Door Set Switch Stuck (Short to Ground)