my Toyota Highlander XU70 (2020-Present) won't go into gear, what could be wrong

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, transmission fluid pump, fluid catch pan.
• Inspect the vehicle for safety and gather all necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.

2. Transmission Fluid Inspection

• Sub-steps:
  1. Remove the transmission dipstick and assess fluid level; add fluid if low.
  2. Inspect the fluid for contamination; if dirty, proceed with a fluid change.
  3. If fluid is leaking, locate the source (lines, pan, seals) and proceed with repairs.

3. Gear Shifter and Linkage Inspection

• Sub-steps:
  1. Remove the center console cover to access the gear shifter assembly.
  2. Inspect the shifter linkage and ensure it is properly connected and not damaged.
  3. Test the shifter's electrical connections for proper function using a multimeter.
  4. Reassemble the console after confirming the linkage is secure.

4. Brake Pedal Position Switch Check

• Sub-steps:
  1. Locate the brake pedal position switch under the dashboard.
  2. Use a multimeter to check for continuity when the brake pedal is pressed.
  3. Replace the switch if it does not provide continuity.

5. Transmission Control Module (TCM) Check

• Sub-steps:
  1. Reconnect the battery and check for any error codes related to the TCM.
  2. If necessary, perform a reset or reprogram the TCM using a compatible scanner.
  3. Test drive the vehicle to ensure proper function.