Driver Mode Select Switch A Range/Performance

Common symptoms

What you'll notice

• Check the wiring connections for the driver mode select switch and ensure proper functionality.
• Inspect and clean the driver mode select switch to remove any dirt or debris that may be affecting its performance.
• Replace the driver mode select switch if it is found to be faulty or damaged beyond repair.
• Reset the electronic control unit (ECU) to clear any error codes and recalibrate the driver mode select switch.
• Consult the vehicle's manual or contact the manufacturer for any specific troubleshooting or diagnostic steps related to the driver mode select switch.

Common causes

Most likely first

1. Faulty driver mode select switch
2. Loose or damaged wiring connections to the driver mode select switch
3. Faulty transmission control module (TCM)
4. Low battery voltage affecting the driver mode select switch operation
5. Software issue in the TCM related to the driver mode select switch functionality

How to diagnose & fix

Work through it in order

1. The vehicle may not switch between different driving modes smoothly or may get stuck in one mode.
2. The engine may experience a drop in power or reduced performance during acceleration or while driving.
3. The check engine light may illuminate on the dashboard, indicating a problem with the driver mode select switch.
4. The vehicle's transmission may not shift properly or may exhibit erratic shifting behavior.
5. The driver may be unable to manually select different driving modes or may experience difficulty in engaging certain modes.