B2685 Diagnostic Trouble Code

B2685 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 B2685 diagnostic trouble code may include:

Misfire
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Reduction in engine performance, especially at low RPM levels

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 :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. 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 you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs.

Process Tips

Diagnostic trouble code B2685 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 B2685.

Fortunately, B2685 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B2685 Trouble Code For Specific Cars

B2685 Bmw Serie 3 Clutch Position Sensor Circuit Low Malfunction
B2685 Lotec Testa Torque Converter Clutch Circuit Malfunction
B2685 Mercedes Slr Mclaren Air Bag Driver Circuit Open
B2685 Vauxhall Astra J PRC Solenoid Circuit Malfunction
B2685 Tata Safari Mirror Passenger Vertical Switch Circuit Failure
B2685 Fiat Supermirafiori Left Front Center Sensor Circuit Fault
B2685 Renault Master 3 Headlamp Mode Select Circuit Failure