U3086 Code:

OBD-II Diagnostic Network (U) Trouble Code

Possible Cause

The reason for U3086 the speedometer may fluctuate wildly or fail to operate, the engine may stall when coming to a stop, engine misfire, sag, stall, or hesitation, a stored code, and possibly an illuminated service engine soon lamp.

Common Symptoms

  1. Always retest the system to ensure a successful repair. If all system circuits are intact connect the scanner to the diagnostic connector and attempt to manually activate the electronic pressure control solenoid
  2. Test the wiring and connectors at the fuel shutoff valve to make sure that voltage and ground readings are near battery voltage
  3. Some applications also utilize the inlet door to regulate air flow through the intake tube by adjusting the degree to which the door opens according to throttle position
  4. The sensor is of the electro magnetic design and uses a reluctor ring (or a specialized set of splines) on the input shaft as reference points

Similar Problems

Accelerator Pedal Position (APP) Sensor 1 Performance
TP Sensor Learn Not Complete
Cruise Inhibit Control Circuit

U3086 Troubleshooting

Having one of the signs of a bad gasket is usually not enough to prove a failure of a gasket, but multiple symptoms are most likely the result of gasket failure. It is advisable to have the vehicle driven as little as possible whenever the symptoms occur. Depending on the symptoms, either have the gasket replaced or repaired.
The cost of replacing a gasket usually varies from one mechanic to the other. Replacing a gasket is quite expensive in modern engines due to their location and the amount of labor that is required to replace them. U3086 OBD2 specifically refers to the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set.

How to turn off U3086 check engine light ?

There are two ways to turn off the check engine light:

A repair technician can do so once repairs have been made.
The OBD II can automatically turn it off when it fails to detect the problem after several diagnostic cycles.

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