P181A Diagnostic Trouble Code

P181A 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 P181A 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. Look at the plug wires to make sure they are not burnt or laying on the exhaust. Now, clear the codes and test-drive the vehicle to see if the code is reset.

Process Tips

Diagnostic trouble code P181A 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 P181A.

Fortunately, P181A is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P181A Trouble Code For Specific Cars

P181A Aston Martin Mark Ii Air Suspension Vent Solenoid Output Circuit Failure
P181A Renault 20 Gear 4 Incorrect ratio
P181A Mitsubishi Sss Auxillary Speed Sensor Fault
P181A Ultima Spyder Power Supply Sensor Circuit Short To Battery
P181A Fiat Sedici Lateral Accelerometer Signal Fault
P181A Lotus Extreme Traction Control Motor Potentiometer Circuit Open
P181A Mercedes-benz Mcc Air Suspension Front Compressor Relay Circuit Short To Battery