U2996 Diagnostic Trouble Code

U2996 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 U2996 diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Diminished fuel efficiency

Possible Causes :

Faulty IMRC actuator/sensor
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. 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. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code U2996 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 U2996.

Fortunately, U2996 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U2996 Trouble Code For Specific Cars

U2996 Ifa F9
U2996 Marcos 1600 Trans Torque Reduction Request Signal Malfunction
U2996 Mercury Tracer Air Suspension Reservoir Solenoid Circuit Failure
U2996 Smart Ultimate Lamp Anti-Theft Indicator Circuit Short To Ground
U2996 Lanchester 30 Speed Control Unable to Hold Speed
U2996 Fairthorpe Em Injector Circuit Malfunction - Cylinder 4
U2996 Aymesa Gala Aux Heater Start Counter Overrun/System Locked (same as below ?)