C0997 Code:

OBD-II Diagnostic Chassis (C) Trouble Code

Possible Cause

Common causes of C0997 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. If there is continuity, the PCM may be faulty (PCM failure is rare and, if replaced, it will need to be reprogrammed)
  2. Look for shorted or burned wiring and replace circuitry and connectors as required
  3. An output speed sensor is used to provide the PCM with a transmission output speed signal
  4. To perform a thorough diagnosis, any transmission leaks should be repaired and the transmission should be filled with the proper amount and type of fluid (if the fluid smells really "burnt" and you are experienced enough to detect it, you may go ahead and condemn the transmission)

Similar Problems

IC Module 4X Ref Circuit Intermittent, No Pulses
BBV Sensor Circuit Low Voltage
PCM Stack Overrun

C0997 Troubleshooting

A sure sign of this is smoke or steam being emitted from underneath the hood. The ignition timing could be set incorrectly and will require adjustment. If, when looking under the hood, you notice that the drive belts appear loose, they need to be tightened or completely replaced. If there is a noticeable pool of fluid underneath the car, this could be a sign of the cylinder head gasket failing. That will be confirmed in the form of billowing smoke being blown from the exhaust system. Parts or components should not be replaced with reference to only a C0997 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 C0997 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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