U2878 Diagnostic Trouble Code

U2878 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 U2878 diagnostic trouble code may include:

Cherry red hot catalytic converter
Poor acceleration
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Reduction in engine performance, especially at low RPM levels

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs. 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. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio.

Process Tips

Diagnostic trouble code U2878 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 U2878.

Fortunately, U2878 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U2878 Trouble Code For Specific Cars

U2878 Fiat Regata Lamp Warning Relay Circuit Short To Ground
U2878 De Soto Diplomat Hood Switch Circuit Open
U2878 Daihatsu Move Glass Break Sensor Failure
U2878 Volvo 360
U2878 Mercedes-benz 15 Air Bag Driver Inflator Circuit Resistance Low on Squib - Loop #2
U2878 Peugeot Nautilus Engine Coolant Sensor intermittent/ECT Sensor Intermittent
U2878 Chevrolet Corsica Driver Side Crash Sensor Internal Fault