B2689 Diagnostic Trouble Code

B2689 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 B2689 diagnostic trouble code may include:

Fuel pressure too high
Diminished fuel efficiency
Rich or lean exhaust
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

Possible Causes :

A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Faulty IMRC actuator/sensor
Faulty IMRC actuator relay (if equipped)

Repair Processes :

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code B2689 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 B2689.

Fortunately, B2689 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B2689 Trouble Code For Specific Cars

B2689 Lada 117 Servo Motor Potentiometer Vent Circuit Short To Ground
B2689 Chery Qq DPFE Circuit Low Input
B2689 Geely Maple O2 Sensor Signals Swapped Bank 1 Sensor 2/ Bank 2 Sensor 2
B2689 Fiat Freemont Lamp Tail Output Circuit Failure
B2689 Abarth 103
B2689 Jensen 4-litre Seat Driver Recline Forward Circuit Short To Battery
B2689 Dellow Mark Hydraulic Pressure Unit Cycling Period Too Short