C0390 Diagnostic Trouble Code

C0390 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 C0390 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 :

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.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors.

Process Tips

Diagnostic trouble code C0390 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 C0390.

Fortunately, C0390 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0390 Trouble Code For Specific Cars

C0390 Puma Gte Fuel Temperature Sensor #2 Circuit Failure
C0390 Volkswagen Concept Reverse Mirror Output Circuit Failure
C0390 Isuzu Rodeo SCP (J1850) Invalid or Missing Data for Vehicle Id (VIN)
C0390 Steyr 500 Lamp Seat Belt Circuit Short To Ground
C0390 Chevrolet Nubira EGR Flow Out Of Self Test Range
C0390 Italdesign Volta Seat Belt Switch Circuit Short To Ground
C0390 Ford Coin Low Coolant Lamp Output Circuit Short to Battery