C128E Diagnostic Trouble Code

C128E 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 C128E diagnostic trouble code may include:

Reduction in engine performance, especially at low RPM levels
Vacuum leak on the engine
Diminished fuel efficiency
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

Fuel with a large percentage of sulfur will clog the DPF quickly
The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Dirty air cleaner element Damaged DPF

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. If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve.

Process Tips

Diagnostic trouble code C128E 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 C128E.

Fortunately, C128E is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C128E Trouble Code For Specific Cars

C128E Chevrolet Cavalier Driver Power Window One Touch Window Relay Circuit Short To Battery
C128E Singer Hunter Intrusion Sensor Fault
C128E Ferrari 166 Injector Control Pressure Sensor Above / Below Desired
C128E Toyota Runx Park Lamp Relay Coil Short to Battery
C128E Opel Agila Damper RF Circuit Short To Battery
C128E Renault Racoon Heated Windshield Input Short to Ground
C128E Mg J4 Air Suspension RR Height Sensor Circuit Failure