U2318 Diagnostic Trouble Code

U2318 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 U2318 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 :

Look at the plug wires to make sure they are not burnt or laying on the exhaust. 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. Now, clear the codes and test-drive the vehicle to see if the code is reset.

Process Tips

Diagnostic trouble code U2318 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 U2318.

Fortunately, U2318 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U2318 Trouble Code For Specific Cars

U2318 Dodge Conquest Ignition Coil D Secondary Circuit Malfunction
U2318 Triumph Scrambler Xe PCM - IDM Communications Error
U2318 Proton 400 Fuel Select Switch Malfunction
U2318 Overland 41 Double Lock Timeout Failure
U2318 Hyundai Kona
U2318 Nissan Qx Crankshaft Position Sensor A Circuit Intermittent
U2318 Saturn Outlook Immobilizer/ECM Communication Error