P2906 Diagnostic Trouble Code

P2906 is a kind of OBD-II Diagnostic P-Powertrain 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 P2906 diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
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.
Faulty IMRC actuator/sensor

Repair Processes :

Look at the plug wires to make sure they are not burnt or laying on the exhaust. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.

Process Tips

Diagnostic trouble code P2906 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 P2906.

Fortunately, P2906 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P2906 Trouble Code For Specific Cars

P2906 Opel Meriva B Door Ajar Lamp Circuit Failure
P2906 Daimler 2.5-litre Gyroscope Error
P2906 Volvo Xc70
P2906 Flint 6-55 Left Rear Sensor Circuit Short to Vbat
P2906 Fiat 16 Hp Lack Of HO2S Switch - Sensor Indicates Rich
P2906 Lancia D50 Speed Wheel Sensor LR Circuit Open
P2906 Lexus Rx400h TFT Sensor In Range Failure Low Value