P042C Diagnostic Trouble Code

P042C is a kind of OBD-II Diagnostic P-Powertrain 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 P042C diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Faulty IMRC actuator/sensor

Repair Processes :

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

Process Tips

Diagnostic trouble code P042C 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 P042C.

Fortunately, P042C is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P042C Trouble Code For Specific Cars

P042C Opel Corsa D Detent Signal Missing During Unlatch
P042C Daihatsu Sp-4 Glow Plug Monitor Fault (Bank #1)
P042C Aston Martin Db7 Air Suspension RR Corner Up Timeout
P042C Lloyd 650 Throttle/Pedal Position Sensor/Switch C Circuit Low Input
P042C Daihatsu Charade Gear Shift Lock Solenoid Circuit High
P042C Subaru Rex License Lamp Circuit Short to Battery
P042C Proton Putra Fuel System Leak Detected Large Leak