P259A Diagnostic Trouble Code

P259A 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 P259A diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

Repair Processes :

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. 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. 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 P259A 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 P259A.

Fortunately, P259A is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P259A Trouble Code For Specific Cars

P259A Ford Expedition 3 Memory 1 Switch Circuit Short To Ground
P259A Mercedes Slk 200 Air Bag Diagnostic Monitor Ground Circuit Failure
P259A Zedel 25 SCP (J1850) Invalid or Missing Data for Windows
P259A Marcos Mantis Transmission 4-Wheel Drive Clutch Relay Open Circuit
P259A Lizard Project Throttle/Pedal Position Sensor/Switch C Circuit High Input
P259A Mitsubishi Outlander Ii Aux Heater Blower Fan Circuit Short to Ground
P259A Lada 2104 Shift Solenoid A Control Circuit Range/Performance