What are the reasons for the gear control lever illumination light not working?

[OHaven]

Gear control lever illumination light not working may be caused by gear switch failure, PCM failure, internal transmission failure, or gear light module damage. Gear switch failure: You can connect a diagnostic computer to check whether it's an electronic fault in the gear switch or an electrical fault in the instrument display. Replace the damaged parts and test drive the vehicle. PCM failure: The PCM receives sensor signals and performs complex calculations to control fuel supply, air distribution, injection and ignition timing, intake pressure adjustment, and determines engine compensation control coefficients based on temperature, load, knock, combustion conditions, etc. Once the PCM fails, the engine will not operate normally, thereby affecting the transmission gear. It is recommended that the owner go to a 4S shop or professional repair shop for computer diagnostic testing and, if necessary, replace the power control module. Internal transmission failure: Internal transmission failure can cause difficulty in shifting and inability to operate, so the gear control lever illumination light will go out. The solution is to check the fault point according to the fault code and carry out corresponding repairs. Gear light module damage: If the vehicle's shifting function is normal, the control lever illumination light not working is caused by damage to the gear light module. The solution is to remove the shifting assembly, replace the small bulb in the non-working position, and then reassemble the parts, after which the shifting light will return to normal.