P187D Diagnostic Trouble Code

P187D 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 P187D diagnostic trouble code may include:

Misfire
Misfire
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 :

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.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

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. 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. If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs.

Process Tips

Diagnostic trouble code P187D 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 P187D.

Fortunately, P187D is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P187D Trouble Code For Specific Cars

P187D Zaz Tavria SCP (J1850) Invalid or Missing Data for Wheels
P187D Saab 96 Ignition Tach Circuit Failure
P187D Lincoln Neiman Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance Problem
P187D Lloyd Alexander Throttle/Pedal Position Sensor/Switch C Circuit Malfunction
P187D Arab 2-litre Air Suspension LR Air Spring/Shock Solenoid Output Circuit Open
P187D Buick Lucerne Cylinder 8 Misfire Detected
P187D Ford Fiesta 7 Microphone Input Signal Circuit Open