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 Lancia Nea SSB Inductive Signature Malfunction
B2689 Renault Fifties Generator Field "F" Control Circuit Malfunction
B2689 Marcos Mini-marcos Transmission 4-Wheel Drive High Indicator Short Circuit To Battery
B2689 Nissan Liberty Column Tilt Feedback Potentiometer Circuit Failure
B2689 Honda Argento Pressure Control Solenoid C Control Circuit Low
B2689 Ferrari 306 Insufficient Coolant Temperature for Closed Loop Fuel Control
B2689 Glas 1300 Over Temperature Fault