P303E Diagnostic Trouble Code

P303E 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 P303E diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Diminished fuel efficiency

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. 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 P303E 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 P303E.

Fortunately, P303E is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P303E Trouble Code For Specific Cars

P303E Maserati Kyalami Transmission Fluid Pressure Sensor/Switch E Circuit Range/Performance
P303E Nissan Pixo Cooling Fan Power/Ground Circuit Malfunction
P303E Benz 16 Blower Switch Failure
P303E Amc Concorde Air Suspension Front Height Sensor High (SE) Signal Circuit Short To Battery
P303E Mg Tb Alarm Panic Input Circuit Short To Ground
P303E Beijing Bj 212 B+ Supply To VCRM Fan Circuit Malfunction
P303E Vauxhall Vectra C Pressure Control Solenoid C Stuck On