B2989 Diagnostic Trouble Code

B2989 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 B2989 diagnostic trouble code may include:

Faulty or damaged wiring
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
Poor fuel economy
Engine surge

Possible Causes :

Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
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 :

With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code B2989 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 B2989.

Fortunately, B2989 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B2989 Trouble Code For Specific Cars

B2989 Volkswagen Karmann Ghia Right Lamp Outage Signal Circuit Short to Ground
B2989 Zaz Wagon SCP (J1850) Invalid or Missing Data for Window Wiper / Washer
B2989 Talbot 25 Mirror Passenger Horizontal Feedback Potentiometer Circuit Failure
B2989 Porsche 911 Type 996 FTS Low - Fuel Pump Temperature Sensor Low
B2989 Isuzu Stylus
B2989 Velie 60 PSP Switch Input Malfunction
B2989 Dodge Ram 2500 Ignition Run/Start Circuit Failure