U0786 Diagnostic Trouble Code

U0786 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 U0786 diagnostic trouble code may include:

Misfire
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Hesitation upon acceleration

Possible Causes :

A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.
Dirty air cleaner element Damaged DPF
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

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

Process Tips

Diagnostic trouble code U0786 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 U0786.

Fortunately, U0786 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0786 Trouble Code For Specific Cars

U0786 Nissan Exa Clutch Pedal Switch B Circuit Low
U0786 Mitsubishi Grandis Autolamp On Circuit Failure
U0786 Lotus Elise Sc Traction Control Input Signal High
U0786 Renault Fifties Generator Field "F" Control Circuit Malfunction
U0786 Volkswagen Eos RF SIDE REPEATER LAMP OUTPUT Ckt Short to Battery
U0786 Daihatsu Materia Gear Shift Reverse Actuator Circuit Range/Performance
U0786 Steyr Type 50 Lamp Turn Signal Front Output Circuit Short To Battery