P2338 Diagnostic Trouble Code

P2338 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 P2338 diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
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.
An air leak forward of the DPF will change the sensor readings resulting in the code

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. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications.

Process Tips

Diagnostic trouble code P2338 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 P2338.

Fortunately, P2338 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P2338 Trouble Code For Specific Cars

P2338 Hotchkiss 3.5-litre Ride Control LF Shock Actuator Circuit Failure
P2338 Aston Martin Vantage Air Temperature External Sensor Circuit Failure
P2338 Bmw X6 Column Reach Feedback Potentiometer Circuit Short to Ground
P2338 Morgan Plus 4 Brake Fluid Level Sensor Input Short Circuit To Ground
P2338 Buckler 90 Cylinder #2 High To Low Side Open
P2338 Mercedes-benz 600 Air Bag Tone Warning Indicator Circuit Short to Battery
P2338 Lotus Eclat TP (Electric) Circuit Malfunction