U2621 Diagnostic Trouble Code

U2621 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 U2621 diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
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.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

Repair Processes :

Now, clear the codes and test-drive the vehicle to see if the code is reset. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code U2621 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 U2621.

Fortunately, U2621 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U2621 Trouble Code For Specific Cars

U2621 Chevrolet Sabia EIC Switch-2 Assembly Circuit Open
U2621 Holden Zafira Pressure Control Solenoid "C" Short Circuit
U2621 Oldsmobile Anthem Cylinder 6 Misfire Detected
U2621 Alpine A310 Air Bag passenger Circuit Open - Loop #2
U2621 Toyota 1600 Needle Lift Sensor Malfunction
U2621 American Limousine Air Suspension Height Sensor Power Circuit Open
U2621 Lamborghini P Solenoid Current Out Of Range