P139D Diagnostic Trouble Code

P139D 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 P139D diagnostic trouble code may include:

Cherry red hot catalytic converter
Poor acceleration
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Reduction in engine performance, especially at low RPM levels

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.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.

Process Tips

Diagnostic trouble code P139D 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 P139D.

Fortunately, P139D is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P139D Trouble Code For Specific Cars

P139D Chrysler Plymouth EVR Control Circuit Malfunction
P139D Fiat 508 Lamp Backup Switch Input Circuit Short To Battery
P139D Saturn Outlook Immobilizer/ECM Communication Error
P139D Chrysler Viper Exhaust Pressure Sensor Low
P139D Ford Expedition 2 Memory 1 Switch Circuit Short To Battery
P139D Lincoln Navigator Throttle/Pedal Position Sensor/Switch A Circuit Low Input
P139D Kissel 8 Servo Motor Potentiometer Airintake Right Circuit Failure