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 Chevrolet Montana 2 EGI Mini - MAF Failed Short Circuit
P042C Vauxhall Belmont Pressure Control Solenoid "A" Open Circuit
P042C Armstrong Siddeley 16 Air Suspension LR Height Sensor Circuit Failure
P042C Ford F-350
P042C Alfa Romeo 2300 ABS Valve Power Relay Circuit Failure
P042C Infiniti G20 SCP (J1850) Invalid or Missing Data for Experimental #4
P042C Maserati Kubang Transmission Fluid Pressure Sensor/Switch E Circuit Low