U2822 Diagnostic Trouble Code

U2822 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 U2822 diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
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.

Repair Processes :

Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications. 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. 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 U2822 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 U2822.

Fortunately, U2822 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U2822 Trouble Code For Specific Cars

U2822 Abarth Mono A/C Cycling Period Too Short
U2822 Pontiac Parisienne Fan Relay (Low) Circuit Malfunction
U2822 Peugeot Tulip Engine Oil Temperature Out Of Self Test Range
U2822 Fiat 503 Lamp Anti-Theft Indicator Circuit Short To Ground
U2822 Sbarro Challenge Injection Control Pressure Out Of Range High
U2822 Saturn Outlook Immobilizer/ECM Communication Error
U2822 Aston Martin Db2 Air Suspension RR Air Spring/Shock Solenoid Output Circuit Failure