C2431 Diagnostic Trouble Code

C2431 is a kind of OBD-II Diagnostic C-Chassis 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 C2431 diagnostic trouble code may include:

Vacuum leak on the engine
Reduction in engine performance, especially at low RPM levels
Engine surge
Diminished fuel efficiency

Possible Causes :

Faulty IMRC actuator/sensor
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code C2431 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 C2431.

Fortunately, C2431 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2431 Trouble Code For Specific Cars

C2431 Volkswagen Crafter Ii Reverse Switch Circuit Malfunction
C2431 Nissan X-terra Cylinder #7 High To Low Side Short
C2431 Hyundai Neos
C2431 Alfa Romeo Alfetta Accelerometer Sensor Circuit Failure
C2431 Bmw B12 Climate Control Air Temperature Internal Sensor Motor Circuit Open
C2431 Irmscher Tigra SCP (J1850) Invalid or Missing Data for Non-Legislated Diagnostics
C2431 Audi Coupe APLSOL Solenoid Circuit Malfunction