P300E Diagnostic Trouble Code

P300E 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 P300E diagnostic trouble code may include:

Faulty PCM
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Poor acceleration
Hesitation upon 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.
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

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. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble.

Process Tips

Diagnostic trouble code P300E 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 P300E.

Fortunately, P300E is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P300E Trouble Code For Specific Cars

P300E Tornado Typhoon Motor Relay # 1 Circuit Short to Battery
P300E Locomobile 90 Timing Reference High Resolution Signal A Too Few Pulses
P300E Fiat Strada Left Front Center Sensor Circuit Failure
P300E Chevrolet Camaro Driver Power Window Motor Circuit Failure
P300E Smart Roadster Lamp Anti-Theft Indicator Circuit Short To Battery
P300E Riley Pathfinder Hydraulic Clutch Actuator Valve Signal Fault
P300E Oldsmobile F-85 Cylinder 9 Injector Circuit Low