why does my Toyota Highlander Third Generation (2014-2019) hesitate when shifting?

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

577 words

Problem Statement

Learn how to diagnose and fix transmission hesitation in Toyota Highlander (2014-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Transmission

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow engine to cool before opening the transmission pan.

Symptoms

•Hesitation or delay when shifting gears
•Unusual engine revving before the shift occurs
•Shuddering or jerking felt during acceleration
•Check engine light illuminated
•Poor fuel economy
•Increased engine noise during shifting

Diagnostic Steps

1
Scan the vehicle's computer for any error codes using an OBD-II scanner.
2
Check the transmission fluid level and condition; look for discoloration or burnt smell.
3
Inspect the transmission fluid filter for clogs or restrictions.
4
Examine the throttle position sensor for proper operation using a multimeter.
5
Test the vehicle's battery and alternator to ensure proper voltage is being supplied to the transmission control module.
6
Perform a road test to replicate the hesitation and note the conditions under which it occurs.

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
•Multimeter
•Transmission fluid pump
•Drain pan
•Socket set
•Funnel
•Screwdrivers

Parts Required

•Transmission fluid (Toyota WS)
•Transmission filter (if needed)
•Throttle position sensor (if needed)

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Diagnostic Steps

1
Scan the vehicle's computer for any error codes using an OBD-II scanner.
2
Check the transmission fluid level and condition; look for discoloration or burnt smell.
3
Inspect the transmission fluid filter for clogs or restrictions.
4
Examine the throttle position sensor for proper operation using a multimeter.
5
Test the vehicle's battery and alternator to ensure proper voltage is being supplied to the transmission control module.
6
Perform a road test to replicate the hesitation and note the conditions under which it occurs.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery to prevent electrical shorts.

2. Check and Replace Transmission Fluid

Tools Required: Transmission fluid pump, drain pan, socket set, funnel.
Sub-steps:
1. Place the drain pan under the transmission pan.
2. Remove the transmission pan bolts and carefully lower the pan.
3. Allow old fluid to drain completely.
4. Inspect the transmission filter; replace if dirty or clogged.
5. Clean the transmission pan and replace the gasket.
6. Reinstall the transmission pan and torque bolts to manufacturer specifications (typically 12-15 ft-lbs).
7. Using the funnel, refill the transmission with the correct type of fluid (Toyota WS fluid recommended) through the dipstick tube.

3. Inspect and Adjust Throttle Position Sensor

Tools Required: Multimeter, screwdriver.
Sub-steps:
1. Locate the throttle position sensor (TPS) on the throttle body.
2. Disconnect the wiring harness from the TPS.
3. Using the multimeter, check the resistance of the TPS at idle and full throttle.
4. If readings are outside manufacturer specifications, replace the TPS.
5. Reconnect the electrical harness after replacement.

4. Check Battery and Alternator

Tools Required: Multimeter.
Sub-steps:
1. Start the engine and measure the voltage at the battery terminals; it should read between 13.7 to 14.7 volts.
2. If the voltage is lower than this, test the alternator by checking the output under load conditions (with accessories turned on).
3. Replace the alternator if it does not meet specifications.