U3031 Diagnostic Trouble Code

U3031 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 U3031 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 :

Now, clear the codes and test-drive the vehicle to see if the code is reset. 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 U3031 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 U3031.

Fortunately, U3031 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U3031 Trouble Code For Specific Cars

U3031 Dkw Special Ignition Coil - Cylinder 3 - Early Activation Fault
U3031 Smart City Lamp ABS Warning Output Circuit Short To Battery
U3031 Vauxhall Viceroy Pressure Control Solenoid Intermittent
U3031 Audi Cabriolet Anti Theft System
U3031 Chevrolet Vivant Engine Coolant Temperature Circuit High Input
U3031 Nissan Tino Cylinder #3 High To Low Side Open
U3031 Isuzu D-max SCP (J1850) Invalid or Missing Data for Telltales