P1187 Diagnostic Trouble Code

P1187 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 P1187 diagnostic trouble code may include:

Diminished fuel efficiency
Fuel pressure too high
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 :

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.
Faulty IMRC actuator/sensor

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. Now, clear the codes and test-drive the vehicle to see if the code is reset.

Process Tips

Diagnostic trouble code P1187 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 P1187.

Fortunately, P1187 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1187 Trouble Code For Specific Cars

P1187 Mg M-type Air Suspension Warning Lamp Circuit Open
P1187 Holden Vn Pressure Control Solenoid "A" Open Circuit
P1187 Bristol 403 Cooling Fan Power/Ground Circuit Malfunction
P1187 Renault Scenic 2 High Fan Control Primary Circuit Malfunction
P1187 Ford Shelby Mirror Passenger Right Circuit Failure
P1187 Light Car Company Rocket Throttle Pedal Position Sensor/Switch A Circuit Malfunction
P1187 Darracq 3-litre Heated Catalyst Efficiency Below Threshold (Bank 2)