C0168 Diagnostic Trouble Code

C0168 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 C0168 diagnostic trouble code may include:

Poor fuel economy
Possible spark knock (detonation / pre-ignition)
Misfire
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.
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for.

Process Tips

Diagnostic trouble code C0168 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 C0168.

Fortunately, C0168 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0168 Trouble Code For Specific Cars

C0168 Gmc Sonoma Park Brake Switch # 1 Released Circuit Short to Gnd
C0168 Holden Club Pedal Position Sensor A Circuit Intermittent
C0168 Caterham Superlight Door Handle Right Front Short To Battery
C0168 Nissan Kubistar Code Word Unregestered
C0168 Dodge Viper Ignition Tach Circuit Short To Ground
C0168 Mazda Rx-8 A Camshaft Position Actuator Circuit (Bank1)
C0168 Mitsubishi Libero Aux A/C Blower Speed 1 Circuit Short to Ground