B0861 Diagnostic Trouble Code

B0861 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 B0861 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. If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for.

Process Tips

Diagnostic trouble code B0861 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 B0861.

Fortunately, B0861 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0861 Trouble Code For Specific Cars

B0861 Lexus Lf TCM Power Relay Sense Circuit Low
B0861 Ford Explorer Memory 2 Switch Circuit Failure
B0861 Bentley Azure Battery Power Supply ECU Circuit Failure
B0861 Alvis Speed Air Flow Blend Door Driver Circuit Failure
B0861 Hyundai Clix SCAIR Solenoid Circuit Malfunction
B0861 Mercedes Sl 55 Air Bag Crash Sensor #2 Feed/Return Circuit Short To Ground
B0861 Subaru Outback 2 LF LAMP LOW BEAM CIRCUIT Failure