C2438 Diagnostic Trouble Code

C2438 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 C2438 diagnostic trouble code may include:

Hesitation upon acceleration
Excessive exhaust leak
Rich or lean exhaust
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

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

Repair Processes :

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. 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. 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 C2438 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 C2438.

Fortunately, C2438 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2438 Trouble Code For Specific Cars

C2438 Invicta 3-litre SCP (J1850) Invalid or Missing Data for Mirrors
C2438 Citroen C1 Ii Front Sounder Circuit Short to Vbatt
C2438 De Soto Custom Hold Switch Circuit Malfunction
C2438 Honda 1300 Pressure Control Solenoid A Control Circuit High
C2438 Toyota Isis Oil Level Switch Circuit Short To Battery
C2438 Riley Kestrel Horn Switch Circuit Failure
C2438 Scion Xd Injector Circuit / IDM Codes Not Updated