B0801 Diagnostic Trouble Code

B0801 is a kind of OBD-II Diagnostic B-Body 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 B0801 diagnostic trouble code may include:

Poor fuel economy
Possible spark knock (detonation / pre-ignition)
Misfire
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.
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly 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. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications.

Process Tips

Diagnostic trouble code B0801 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 B0801.

Fortunately, B0801 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0801 Trouble Code For Specific Cars

B0801 Nissan Livina Column Tilt Feedback Potentiometer Circuit Open
B0801 Pierce-arrow Raceabout Engine Over Speed Condition
B0801 Pininfarina Spider Evaporative Check Solenoid Circuit Malfunction
B0801 Holden Maloo Power Supply #1 Circuit Short to Ground
B0801 Ford 49 LF LAMP HIGH BEAM CIRCUIT Failure
B0801 Bmw Coupe Climate Control Temperature Differential Circuit Short To Battery
B0801 Toyota Windom Passenger Seat Rearward Switch Circuit Short to Battery