P0651 Diagnostic Trouble Code

P0651 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 P0651 diagnostic trouble code may include:

Reduction in engine performance, especially at low RPM levels
Vacuum leak on the engine
Diminished fuel efficiency
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
Dirty air cleaner element Damaged DPF

Repair Processes :

It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. 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 P0651 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 P0651.

Fortunately, P0651 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0651 Trouble Code For Specific Cars

P0651 Scion Xd Injector Circuit / IDM Codes Not Updated
P0651 Nsu Wankel Cylinder 2 Injector Circuit High
P0651 Hurtu Type X Rotor Sensor Fault
P0651 Mercedes Glk Accelerometer Sensor Circuit Failure
P0651 Alfa Romeo Rm Air Bag Crash Sensor #1 Ground Circuit Short To Ground
P0651 Franklin 11 Needle Lift Sensor Malfunction
P0651 Caterham 120 Superlight Door Ajar Lamp Circuit Short To Ground