P0744 Diagnostic Trouble Code

P0744 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 P0744 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. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data.

Process Tips

Diagnostic trouble code P0744 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 P0744.

Fortunately, P0744 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0744 Trouble Code For Specific Cars

P0744 Mercury Colony Air Suspension LR Air Compress Request Exceeded Max Timing
P0744 Cadillac Coupe Decklid Ajar Rear Door Circuit Short To Battery
P0744 Imperial Custom
P0744 Fiat Cabriolet Lamp Headlamp Low-Beam Circuit Open
P0744 Maserati Mc12 Transmission Fluid Pressure Sensor/Switch F Circuit High
P0744 Wills Sainte Claire A SCP (J1850) Invalid or Missing Data for Non-Legislated Diagnostics
P0744 Opel Calibra Decklid Ajar Rear Door Circuit Short To Battery