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What could cause my Toyota Highlander to have a rough transmission shift? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/What could cause my Toyota Highlander to have a rough transmission shift?

What could cause my Toyota Highlander to have a rough transmission shift?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
2-4 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
670 words

Problem Statement

Learn how to diagnose and fix rough transmission shifts in a 2020-2023 Toyota Highlander with our step-by-step guide.

Affected Component
Transmission
Estimated Time
2-4 hours

Symptoms

  • •Noticeable jerking or lurching during shifts.
  • •Delay in engagement when changing from park to drive or reverse.
  • •Harsh shifts at low speeds or high RPMs.
  • •Unusual noises during shifting (clunking or grinding).
  • •Check Engine Light (CEL) may be illuminated.

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

  • ✓Test the affected component to ensure it functions correctly
  • ✓Check for any error codes or warning lights
  • ✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • •OBD-II scanner
  • •Transmission dipstick
  • •Funnel
  • •Clean cloth
  • •Flashlight
  • •Basic hand tools (screwdriver, wrench)
  • •Transmission fluid
  • •Transmission jack
  • •Socket set
  • •Transmission pan gasket

Additional Information

Affected Component
Transmission
Estimated Time
2-4 hours
Difficulty
medium
Severity
medium
Tools Required
10 items

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Back to Generation
Diagnosing Rough Transmission Shifts in a 2020-2023 Toyota Highlander (Fourth Generation, XU70)

Symptoms:

  • Noticeable jerking or lurching during shifts.
  • Delay in engagement when changing from park to drive or reverse.
  • Harsh shifts at low speeds or high RPMs.
  • Unusual noises during shifting (clunking or grinding).
  • Check Engine Light (CEL) may be illuminated.
Common Causes

  1. Low or Contaminated Transmission Fluid:

    • Low fluid levels can lead to a lack of hydraulic pressure, causing rough shifts.
    • Contaminated fluid can lead to improper lubrication and shifting.

  2. Faulty Transmission Control Module (TCM):

    • An issue with the TCM can lead to incorrect shifting patterns.

  3. Worn Clutch Packs or Bands:

    • In automatic transmissions, worn components can lead to slipping and harsh engagements.

  4. Faulty Solenoids:

    • Transmission solenoids regulate fluid flow; if one fails, it can cause harsh shifts.

  5. Mechanical Issues:

    • Internal mechanical failures can lead to rough shifts.
Repair Instructions

Step 1: Change Transmission Fluid

  1. Tools Required: Transmission fluid, funnel, transmission jack, socket set, transmission pan gasket.
  2. Procedure:
    • Raise the vehicle using a jack and secure it with jack stands.
    • Place a drain pan under the transmission pan and remove the pan bolts.
    • Carefully remove the transmission pan and drain the old fluid.
    • Replace the filter (if applicable) and clean the pan.
    • Install a new gasket and reattach the transmission pan with the appropriate torque.
    • Fill the transmission with new fluid using the funnel through the dipstick tube until the correct level is reached.

Step 2: Replace the Transmission Control Module (if applicable)

  1. Tools Required: Socket set, screwdrivers.
  2. Procedure:
    • Disconnect the negative battery terminal.
    • Locate the TCM (usually near the transmission).
    • Remove the electrical connectors and bolts securing the TCM.
    • Install the new TCM and reconnect the electrical connectors.
    • Reconnect the battery terminal and clear any DTCs if necessary.

Step 3: Inspect/Replace Solenoids

  1. Tools Required: Socket set, screwdrivers.
  2. Procedure:
    • Remove the transmission pan again if necessary to access the solenoids.
    • Disconnect the wiring harness from the solenoids.
    • Remove the old solenoids and install new ones.
    • Reassemble the transmission pan and refill with fluid as described above.
Final Steps
  1. Recheck Fluid Levels: After any repairs, ensure the transmission fluid level is correct.
  2. Test Drive: Take the vehicle for another test drive to ensure the rough shifting has been resolved.
  3. Monitor: Keep an eye on the transmission performance over the next few days to ensure the issue does not return.

If the problem persists after these steps, further diagnostics may be needed, potentially involving deeper inspection of transmission internals or professional assistance.