U1868 Diagnostic Trouble Code

U1868 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 U1868 diagnostic trouble code may include:

Vacuum leak on the engine
Reduction in engine performance, especially at low RPM levels
Engine surge
Diminished fuel efficiency

Possible Causes :

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

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. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code U1868 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 U1868.

Fortunately, U1868 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U1868 Trouble Code For Specific Cars

U1868 Opel Frontera B Dim Panel Increase Input Circuit Failure
U1868 Mazda B2500 Transmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit To Ground
U1868 Gmc Typhoon Park Lamp Flash Relay Circuit Failure
U1868 Bugatti Type 73 Cylinder 2 Injector Circuit Low
U1868 Hyundai Sonata 6 SCP (J1850) Invalid or Missing Data for Electric Defrost
U1868 Glas 1300 Over Temperature Fault
U1868 Hyundai Tiburon