U0108 Diagnostic Trouble Code

U0108 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 U0108 diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

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.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

Repair Processes :

If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. 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 U0108 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 U0108.

Fortunately, U0108 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0108 Trouble Code For Specific Cars

U0108 Datsun 1800 High Fan Control Primary Circuit Malfunction
U0108 Citroen Evasion Fuel level Sensor Circuit Low Input
U0108 Mg Rv13 Air Temperature Internal Sensor Circuit Open
U0108 Scion Xa Injection Timing Control Circuit Malfunction
U0108 Astra Utility Air Temperature External Sensor Circuit Short To Battery
U0108 Hyundai Xg25 SCP (J1850) Invalid or Missing Data for Engine Sensors
U0108 Pontiac Ventura Front Crash Sensor Mount Fault