P251F Diagnostic Trouble Code

P251F 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 P251F diagnostic trouble code may include:

If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Corroded or damaged connector
Reduction in engine performance, especially at low RPM levels
Hesitation upon acceleration

Possible Causes :

A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.
Dirty air cleaner element Damaged DPF
Fuel with a large percentage of sulfur will clog the DPF quickly

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 P251F 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 P251F.

Fortunately, P251F is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P251F Trouble Code For Specific Cars

P251F Cadillac Deville Decklid Punch-Out Sensor Battery Short
P251F Packard Patrician Driver Door Handle Circuit Failure
P251F Alvis 4.3 Litre Air Bag Safing Sensor Output Circuit Short To Battery
P251F Ferrari Superamerica Keyless Entry Circuit Open
P251F Mazda B3000 Transmission Transfer Case Differential Lock-Up Feedback Switch Circuit Failure
P251F Mercedes-benz Gl Class Air Suspension Disable Switch Circuit Short To Ground
P251F Lamborghini Gallardo Lp560 Shift/Timing Solenoid Low