C20EC Diagnostic Trouble Code

C20EC 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 C20EC 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
Hesitation upon acceleration

Possible Causes :

Some aftermarket accessories and performance modifications
A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.

Process Tips

Diagnostic trouble code C20EC 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 C20EC.

Fortunately, C20EC is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C20EC Trouble Code For Specific Cars

C20EC Maserati Royale Transmission Fluid Temperature Sensor Circuit Range/Performance
C20EC Mercedes-benz 280 Air Bag Passenger Circuit Short to Battery - Loop #2
C20EC Ferrari 410 Intake Air Temperature Sensor 2 Circuit Low
C20EC Honda Acura Slx Pressure Control Solenoid C
C20EC Bentley State Blower (Fan) Circuit Failure
C20EC Lancia Y STEERING Wheel Angle 1and 2 Circuit Failure
C20EC Bugatti Eb118 Cylinder #5 High To Low Side Open