C0051 Diagnostic Trouble Code


C0051 is a kind of OBD-II Diagnostic C-Chassis 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 C0051 diagnostic trouble code may include:
  • Faulty PCM
  • The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
  • Poor acceleration
  • Engine surge
Place of C0051 in engine

Possible Causes :

  • Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
  • An air leak forward of the DPF will change the sensor readings resulting in the code
  • A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

Look at the plug wires to make sure they are not burnt or laying on the exhaust. 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. Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness.

Process Tips

Diagnostic trouble code C0051 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 C0051.

Fortunately, C0051 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

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