P056A Diagnostic Trouble Code

P056A 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 P056A diagnostic trouble code may include:

Misfire
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

Fuel with a large percentage of sulfur will clog the DPF quickly
The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. 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 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.

Process Tips

Diagnostic trouble code P056A 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 P056A.

Fortunately, P056A is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P056A Trouble Code For Specific Cars

P056A Audi Rs5 ASM Mode Circuit Intermittent
P056A Monica 590 Battery Module Voltage Out Of Range
P056A Toyota Tundra Passenger Power Window Motor Circuit Short To Battery
P056A Chevrolet Hhr Dual Alternator Upper Fault
P056A Saab Aero-x Ignition Tamper Circuit Open
P056A Morris 1800 Brake Pedal Input Circuit Failure
P056A Nissan 100 Central Lock Motor Failure