U0938 Diagnostic Trouble Code

U0938 is a kind of OBD-II Diagnostic U-Network 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 U0938 diagnostic trouble code may include:

If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Corroded or damaged connector
Reduction in engine performance, especially at low RPM levels
Malfunction Indicator Lamp (MIL) illuminated

Possible Causes :

Fuel with a large percentage of sulfur will clog the DPF quickly
The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Dirty air cleaner element Damaged DPF

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. Look at the plug wires to make sure they are not burnt or laying on the exhaust. Now, clear the codes and test-drive the vehicle to see if the code is reset.

Process Tips

Diagnostic trouble code U0938 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 U0938.

Fortunately, U0938 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0938 Trouble Code For Specific Cars

U0938 Holden Jb Power Sliding Door Override Switch Input Ckt Short to Gnd
U0938 Kia Picanto Ii Seatbelt Passenger Pretensioner Circuit Resistance Low on Squib
U0938 Panther Kallista Driver Sid, Side mount Airbag Circuit Open
U0938 Mercedes Ml Accelerometer Sensor Circuit Open
U0938 Mitsubishi Aspire Audio Front Control Module (ACM) is Not Responding
U0938 Chevrolet Touring Electronic Throttle Monitor PCM Override
U0938 Vale 1100 Power Window LR Motor Circuit Short To Ground