how to fix Toyota Tacoma N300 (2016-Present) transmission slipping when shifting

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is turned off.
• Disconnect the battery to prevent electrical shorts.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Locate the transmission dipstick or fill plug.
  2. Remove the dipstick and check the fluid level; add fluid if low.
  3. If the fluid appears dark or smells burnt, prepare to replace it.
  4. Drain the old transmission fluid by removing the drain plug or pan.
  5. Replace the drain plug and refill the transmission with new fluid as per manufacturer's specifications (typically Toyota ATF WS).
• Tools Required: Socket set, funnel, drain pan
• Safety Warnings: Ensure the engine is cool before working on the transmission.

3. Inspect and Replace Transmission Filter

• Sub-steps:
  1. Remove the transmission pan by unscrewing the bolts (use a torque wrench to avoid over-tightening).
  2. Carefully remove the old transmission filter and inspect for debris.
  3. Install the new transmission filter, ensuring it is seated properly.
  4. Clean the transmission pan and replace the gasket before reattaching.
• Tools Required: Socket set, torque wrench, gasket scraper
• Safety Warnings: Use gloves to avoid contact with old fluid.

4. Reprogram or Replace Transmission Control Module (if necessary)

• Sub-steps:
  1. Reconnect the battery.
  2. Use an OBD-II scanner to check for TCM updates or reprogramming needs.
  3. If a replacement is needed, locate the TCM, unplug the electrical connectors, and remove it.
  4. Install the new TCM and reconnect all wiring.
• Tools Required: OBD-II scanner, socket set
• Safety Warnings: Ensure the battery is disconnected before working on electrical systems.