U229A Diagnostic Trouble Code

U229A 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 U229A diagnostic trouble code may include:

Engine surge
Blown fuse (if applicable)
Lack of power
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)
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors. 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.

Process Tips

Diagnostic trouble code U229A 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 U229A.

Fortunately, U229A is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U229A Trouble Code For Specific Cars

U229A Lea-francis 12 System Voltage Malfunction
U229A Cadillac Solitaire Dim Panel Increase Input Circuit Short To Ground
U229A Dodge Caliber Ignition Coil C Primary Circuit Malfunction
U229A Chevrolet Beretta Driver Mirror Power Driver Circuit Short Ground
U229A Alfa Romeo 22 ABS System Is Not Operational
U229A Bmw 120 Cam Calibration Fault
U229A Ford Courier Malfunction Indicator Lamp (MIL) Control Circuit Malfunction