P159D Diagnostic Trouble Code

P159D 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 P159D 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
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. 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.

Process Tips

Diagnostic trouble code P159D 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 P159D.

Fortunately, P159D is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P159D Trouble Code For Specific Cars

P159D Mercury Colony Air Suspension LR Air Compress Request Exceeded Max Timing
P159D Honda Saber Reference Voltage Out of Range (+5 v)
P159D Mercury Mariner Air Suspension LR Height Sensor Circuit Short To Ground
P159D Mg Midget Air Suspension Vent Solenoid Output Circuit Short To Ground
P159D Bianchi S Brake Pedal Input Circuit Ground Short
P159D Lamborghini 350 Shift Solenoid E Performance or Stuck Off
P159D Mitsubishi Model A Aux A/C Control Switch Reference Circuit Short to Ground