C3085 Code:

OBD-II Diagnostic Chassis (C) Trouble Code

Possible Cause

Common causes of C3085 include four-wheel drive switch or actuator failures. Other causes include faulty sensors, solenoids, or switches, and defective wiring harnesses and connectors.

Common Symptoms

  1. Look for loose or corroded electrical connectors that may increase circuit resistance and cause these types of codes to be stored. Obtain a CAN bus system wiring diagram and/or pin out value chart, then use the digital volt ohmmeter to test continuity between individual controller connectors
  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 are equipped with up to 18 separate control modules. If you choose to tackle this monumental task, begin with a careful visual inspection of all system circuitry, connectors, and fuses
  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
Park/Neutral Postion (PNP) Switch Circuit Engine Torque Signal Circuit

C3085 Troubleshooting

White smoke means that the fuel that is being injected into the combustion chamber is not being burned properly. The common causes that produce white smoke range from something as simple as low engine compression or water in the fuel to the fuel pump timing being thrown off because something is starving the fuel from getting to the pump in the manner necessary for the pump to time and work correctly. Parts or components should not be replaced with reference to only a C3085 DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.

How to turn off C3085 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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