U017C Diagnostic Trouble Code

U017C 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 U017C diagnostic trouble code may include:

Vacuum leak on the engine
Reduction in engine performance, especially at low RPM levels
Engine surge
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly

Possible Causes :

A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Faulty IMRC actuator/sensor
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

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. 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 damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code U017C 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 U017C.

Fortunately, U017C is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U017C Trouble Code For Specific Cars

U017C Lotus Esprit Traction Control Module Request Circuit Failure
U017C Mercury Grand Air Suspension LR Corner Down Timeout
U017C Fiat 130 Knock Sensor 2 Circuit High Input (Bank 2)
U017C Monteverdi Sierra Battery Saver Power Relay Circuit Failure
U017C Chevrolet Blazer Driver Power Window Down Circuit Short To Battery
U017C Renault Espace 3 Gear Shift position short to ground
U017C Mazda Mx-flexa 1-4 Upshift (Skip Shift) Solenoid Control Circuit Malfunction