P0800 Diagnostic Trouble Code

P0800 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 P0800 diagnostic trouble code may include:

The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Faulty or damaged wiring
Hesitation upon acceleration
Diminished fuel efficiency

Possible Causes :

The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
Defective ECU strategies or components will prevent proper regeneration
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. 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 P0800 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 P0800.

Fortunately, P0800 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0800 Trouble Code For Specific Cars

P0800 Citroen Nemo Fuel Pump Primary Circuit Malfunction
P0800 Citroen Lna Fuel Pump Low Speed Malfunction
P0800 Subaru Stella Line Pressure Solenoid System
P0800 American Tourist Air Suspension LF Air Spring Solenoid Output Circuit Failure
P0800 Hyundai Dynasty SCP (J1850) Invalid Data from REM
P0800 Adler 15 ABS Inlet Valve Coil RR Circuit Open
P0800 De Tomaso Vallelunga Hydraulic Fluid Pressure/ Flow Circuit Short to Gnd