C254E Diagnostic Trouble Code

C254E 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 C254E diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Diminished fuel efficiency

Possible Causes :

Faulty IMRC actuator/sensor
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. 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.

Process Tips

Diagnostic trouble code C254E 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 C254E.

Fortunately, C254E is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C254E Trouble Code For Specific Cars

C254E Holden Vk Powertrain Performance Mode Switch Circuit failure
C254E Mazda Miata Turbocharger Boost Sensor B Circuit High
C254E Lawil S System Too Lean (Bank 2)
C254E Ford Focus 3 Mirror Driver Down Short To Ground
C254E Lincoln Neiman Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance Problem
C254E Chevrolet Intimidator Dynamic Stability Control Right Front Valve Malfunction
C254E Skoda Superb Iii Lack Of HO2S21 Switch - Sensor Indicates Rich