B2909 Diagnostic Trouble Code

B2909 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 B2909 diagnostic trouble code may include:

Faulty O2 Sensor
Lack of power
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Hesitation upon acceleration

Possible Causes :

Some aftermarket accessories and performance modifications
A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Fuel with a large percentage of sulfur will clog the DPF quickly

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. Now, clear the codes and test-drive the vehicle to see if the code is reset.

Process Tips

Diagnostic trouble code B2909 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 B2909.

Fortunately, B2909 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B2909 Trouble Code For Specific Cars

B2909 Ferrari P4/5 Keep Alive Memory Test Failure
B2909 Citroen Bijou Front Echo Sensor Circuit Failure
B2909 Renault 5 Gear Lever X Position Circuit Intermittent
B2909 Ford Street Ka Mirror Passenger Up Circuit Short To Ground
B2909 Subaru Impreza Left Rear Center Sensor Circuit Fault
B2909 Delage D Hydraulic Oil Temperature Sensor Circuit Intermittent
B2909 Ferrari D50 Interior Lamp Override Switch Open Circuit