B2651 Diagnostic Trouble Code

B2651 is a kind of OBD-II Diagnostic B-Body 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 B2651 diagnostic trouble code may include:

The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Faulty or damaged wiring
Hesitation upon acceleration
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.
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio.

Process Tips

Diagnostic trouble code B2651 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 B2651.

Fortunately, B2651 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B2651 Trouble Code For Specific Cars

B2651 Mazda Hakaze Turbo Boost Pressure Low
B2651 Nissan 1600 Child Seat Detection Circuit Short To Battery
B2651 Hillman Super Minx PCM - IDM Communications Error
B2651 Zil 114 SCP (J1850) Single Ended (+) Circuit Failure
B2651 Studebaker Golden Hawk Lamp Turn Signal Right Circuit Open
B2651 Holden Vh Power Window RR Motor Circuit Short To Ground
B2651 Pininfarina Spider Evaporative Check Solenoid Circuit Malfunction