C2651 Diagnostic Trouble Code

C2651 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 C2651 diagnostic trouble code may include:

Malfunction Indicator Lamp (MIL) illuminated
Carbon Buildup on O2 Sensor
Poor fuel economy
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. 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 C2651 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 C2651.

Fortunately, C2651 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2651 Trouble Code For Specific Cars

C2651 Holden Td Power Window LR Motor Circuit Short To Ground
C2651 Renault Fregate Glow Plug Circuit High Input (Bank #1)
C2651 Chevrolet Lumina ECU Is Defective
C2651 Simca Vedette Marly Internal Control Module Keep Alive Memory (KAM) Error
C2651 Mazda Xedos 9 A/C Post Heater Sensor Circuit Failure
C2651 Abarth 600 A Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
C2651 Caterham 485r Door Ajar LR Circuit Short To Ground