P2640 Diagnostic Trouble Code

P2640 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 P2640 diagnostic trouble code may include:

Hesitation upon acceleration
Excessive exhaust leak
Rich or lean exhaust
Lack of power

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 relay (if equipped)

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. Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed.

Process Tips

Diagnostic trouble code P2640 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 P2640.

Fortunately, P2640 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P2640 Trouble Code For Specific Cars

P2640 Chevrolet Corvette C4 Driver Side, Side mount Airbag Low capacitance on Squib
P2640 Lancia Ardea Speed Wheel Sensor All Coherency Failure
P2640 Audi S4 Audio CD/DJ Thermal Shutdown Fault
P2640 Skoda Praktik Knock Sensor 2 Circuit Range/Performance (Bank )
P2640 Tvr Tuscan Power Steering Pressure Sensor Circuit Low Input
P2640 Bugatti Chiron Cylinder #3 High To Low Side Short
P2640 Cadillac Fleetwood Decklid Release Circuit Short To Battery