U2946 Diagnostic Trouble Code

U2946 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 U2946 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 :

Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Some aftermarket accessories and performance modifications

Repair Processes :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for.

Process Tips

Diagnostic trouble code U2946 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 U2946.

Fortunately, U2946 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U2946 Trouble Code For Specific Cars

U2946 Ford Ecosport 2 Mass or Volume Air flow Circuit Intermittent
U2946 Mercedes E 350 Accelerate Warmup Solenoid Circuit Malfunction
U2946 Tvr 400 Power Door Lock Circuit Open
U2946 Gilbern Invader Oil Level Lamp Circuit Short To Battery
U2946 Chevrolet Citation Driver Rear Door Ajar Circuit Open
U2946 Checker Marathon Door Passenger Reset Switch Stuck Failure
U2946 Holden Xu Pressure Control Solenoid "C" Open Circuit