U3199 Diagnostic Trouble Code

U3199 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 U3199 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
Diminished fuel efficiency

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. 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. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.

Process Tips

Diagnostic trouble code U3199 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 U3199.

Fortunately, U3199 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U3199 Trouble Code For Specific Cars

U3199 Holden Vectra Power Window RR Motor Circuit Short To Battery
U3199 Monteverdi Sierra Battery Saver Power Relay Circuit Failure
U3199 Mini Roadster ASM Mode Circuit Low
U3199 Hanomag 2 Passenger Sliding Door Ajar Circuit Short to GND
U3199 Auto-union 1000 Aux Heater Fuel Pump Circuit Open
U3199 Austin A40 Autolamp Delay Increase Circuit Open
U3199 Reliant Bug Fuel Volume Regulator Control Circuit/Open