U2279 Diagnostic Trouble Code

U2279 is a kind of OBD-II Diagnostic U-Network 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 U2279 diagnostic trouble code may include:

Misfire
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
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.
An air leak forward of the DPF will change the sensor readings resulting in the code

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. Look at the plug wires to make sure they are not burnt or laying on the exhaust. Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed.

Process Tips

Diagnostic trouble code U2279 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 U2279.

Fortunately, U2279 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U2279 Trouble Code For Specific Cars

U2279 Chrysler Ccv Engine Overtemp Condition
U2279 Toyota Mr2 Spyder Output Speed Sensor Intermittent
U2279 Mazda B2500 Transmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit To Ground
U2279 Skoda 1200 Keep Alive Memory Test Failure
U2279 Citroen Gs Fuel Level Sensor Circuit Range/Performance
U2279 Nissan Cube Ii Clutch Pedal Switch A Circuit
U2279 Opel Ampera-e Damper RR Circuit Open