U2808 Diagnostic Trouble Code

U2808 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 U2808 diagnostic trouble code may include:

Rich or lean exhaust
Fuel pressure too low
Engine surge
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

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.
Faulty IMRC actuator relay (if equipped)

Repair Processes :

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. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. 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.

Process Tips

Diagnostic trouble code U2808 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 U2808.

Fortunately, U2808 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U2808 Trouble Code For Specific Cars

U2808 Gaz 35 O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
U2808 Delahaye 235 Hydraulic Pressure Sensor Circuit High Input
U2808 Peugeot Quasar Engine Coolant Temperature Circuit Range/Performance Problem
U2808 Mazda Az Transmission Transfer Case Counter Clockwise Shift Relay Coil Open Circuit
U2808 Peugeot 807 Electrodrive Fan 1 Operational Failure (Driver Side)
U2808 Ford Festiva Metering Oil Pump Temperature Sensor Circuit Malfunction
U2808 Vauxhall Prince Pressure Control Solenoid C