U2990 Diagnostic Trouble Code

U2990 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 U2990 diagnostic trouble code may include:

Carbon Buildup on O2 Sensor
Malfunction Indicator Lamp (MIL) illuminated
Hesitation upon acceleration
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.
Some aftermarket accessories and performance modifications

Repair Processes :

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. 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 U2990 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 U2990.

Fortunately, U2990 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U2990 Trouble Code For Specific Cars

U2990 Nissan President Crankshaft Position (CKP)/Ignition Coil - Cylinder 4 - Early Activation Fault
U2990 Porsche Cayman Type 987 Fuel Pump Monitor Circuit High Input
U2990 Toyota 4500 No Communication to TV Module (No Fitting of TV)
U2990 Maserati Spider Transmission Mechanical 4-Wheel Drive Axle Lock Lamp Circuit Short To Battery
U2990 Mitsubishi Raider Aux Heater Flame Out Fault
U2990 Alvis Ta21 Air Pressure Low Circuit Short to Gnd
U2990 Triumph Toledo Pedal Correlation PDS1 and PDS2