P2439 Diagnostic Trouble Code

P2439 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 P2439 diagnostic trouble code may include:

Possible spark knock (detonation / pre-ignition)
Poor fuel economy
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
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.
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors.

Process Tips

Diagnostic trouble code P2439 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 P2439.

Fortunately, P2439 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P2439 Trouble Code For Specific Cars

P2439 Skoda Kamiq Kickdown Relay Pull - In Circuit Fault
P2439 Talbot T 26 Mirror Passenger Right Circuit Short To Battery
P2439 Toyota Mega Cruiser Output Circuit Check Signal High
P2439 Chevrolet Chevelle Driver Power Window Up Circuit Short To Battery
P2439 Porsche 911 Type 997 Fuel Composition Sensor Circuit High Input
P2439 Maserati 4cl Transmission Fluid Pressure Sensor/Switch A Circuit Intermittent
P2439 Ford Torino Mirror Switch Assembly Circuit Short to Ground