C1843 Code:

OBD-II Diagnostic Chassis (C) Trouble Code

Possible Cause

Common causes of C1843 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. Repair or replace system circuits/connectors as required and retest the system to ensure that repairs were successful. Using the manufacturer's wiring diagram for the input/output speed sensor, test all related circuits and sensors for resistance and continuity and compare your findings with manufacturer's specifications
  2. Look for shorted or burned wiring and replace circuitry and connectors as required
  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. 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

Computer And Auxiliary Outputs
IC Circuit High Voltage
A/C System High Pressure High Temperature

C1843 Troubleshooting

If there is a clicking noise when you attempt to start the engine and the engine does not crank, it typically means there is something wrong with the battery, such as a low or discharged battery or corroded or loose battery cables. If the engine cranks when you attempt to start the car, but fails to turn over, this may mean there is a problem with the fuel or ignition. Other common reasons an engine may fail to start include a failure of the starter motor relay, a clogged fuel filter, a defective fuel pump or an ignition switch failure. Parts or components should not be replaced with reference to only a C1843 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 C1843 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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