U3518 Diagnostic Trouble Code

U3518 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 U3518 diagnostic trouble code may include:

Faulty O2 Sensor
Lack of power
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.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

Look at the plug wires to make sure they are not burnt or laying on the exhaust. 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. If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for.

Process Tips

Diagnostic trouble code U3518 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 U3518.

Fortunately, U3518 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U3518 Trouble Code For Specific Cars

U3518 Toyota Hilux Viii Oil Level Lamp Circuit Short To Battery
U3518 Talbot Alpine Mirror Passenger Horizontal Feedback Potentiometer Circuit Short to Ground
U3518 Fiat 2300 Lamp ABS Warning Output Circuit Failure
U3518 Bugatti Type 46 Cylinder 11 Injector Circuit Low
U3518 Seat 131 Injector Circuit Malfunction - Cylinder 12
U3518 Honda Fit Ii PRNDL Reverse Input Open Circuit
U3518 Volvo S70 SCP (J1850) Invalid or Missing Data for Experimental #2