U0242 Diagnostic Trouble Code

U0242 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 U0242 diagnostic trouble code may include:

Blown fuse (if applicable)
Engine surge
Reduction in engine performance, especially at low RPM levels
Rich or lean exhaust

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Dirty air cleaner element Damaged DPF

Repair Processes :

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. 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 U0242 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 U0242.

Fortunately, U0242 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0242 Trouble Code For Specific Cars

U0242 Ferrari 550 Intake Manifold Runner Control (Stuck Open)
U0242 Chevrolet Beretta Driver Mirror Power Driver Circuit Short Ground
U0242 Mazda Mazda 3 Ii Turbo/Super Charger Boost Control Solenoid Circuit/Open
U0242 Ford M350 Mirror Driver Up/Down Motor Stalled
U0242 Nissan Cherry Climate Control Water Temperature Sensor Circuit Short To Ground
U0242 Farbio Gts Injector Circuit Open / Shorted - Cylinder #2
U0242 Rover Mgf Ignition Coil K Primary/Secondary Circuit Malfunction