why does my Toyota Camry XV70 (2018-2024) transmission hesitate when accelerating

Toyota Camry XV80 (2025-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

594 words

Problem Statement

Learn how to diagnose and fix transmission hesitation in Toyota Camry XV70 (2018-2024). 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 the engine and transmission to cool before opening any components to prevent burns.

Symptoms

•Hesitation or delay when pressing the accelerator
•Unusual or harsh shifting between gears
•Slipping sensation when accelerating
•Check engine light illuminated
•Decreased fuel efficiency
•Transmission fluid leaks under the vehicle

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any transmission-related trouble codes.
2
Inspect the transmission fluid level and condition; look for signs of contamination or burnt smell.
3
Check for any external leaks around the transmission and fluid lines.
4
Perform a visual inspection of the transmission control module (TCM) and wiring for damage or loose connections.
5
Test drive the vehicle to replicate the hesitation issue while monitoring transmission performance.
6
Check the throttle position sensor (TPS) and mass airflow sensor (MAF) for proper function.

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
•Socket set
•Torque wrench
•Multimeter
•Fluid pump

Parts Required

•Transmission fluid (Toyota ATF)
•Transmission filter (if applicable)
•Gasket for transmission pan
•Throttle position sensor (if replacement is necessary)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any transmission-related trouble codes.
2
Inspect the transmission fluid level and condition; look for signs of contamination or burnt smell.
3
Check for any external leaks around the transmission and fluid lines.
4
Perform a visual inspection of the transmission control module (TCM) and wiring for damage or loose connections.
5
Test drive the vehicle to replicate the hesitation issue while monitoring transmission performance.
6
Check the throttle position sensor (TPS) and mass airflow sensor (MAF) for proper function.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to ensure safety while working on electrical components.

2. Fluid Inspection and Replacement

Check Fluid Level
- Locate the transmission dipstick, if equipped, or access the fill plug.
- With the engine running and in park, check the fluid level; add ATF (automatic transmission fluid) if low.
Fluid Change
- If fluid appears burnt or contaminated, drain the old fluid using a fluid pump or drain plug.
- Replace with the recommended Toyota ATF (check owner's manual for specifications).
- Ensure to refill to the proper level.

3. Replace Transmission Filter (if applicable)

Remove Transmission Pan
- Support the vehicle securely on jack stands.
- Remove bolts from the transmission pan using a socket set.
- Carefully lower the pan, allowing fluid to drain fully.
Replace Filter
- Remove the old transmission filter and replace it with a new one.
- Clean the pan and install a new gasket.
Reinstall Pan
- Torque pan bolts to manufacturer specifications (usually around 10-12 ft-lbs).
- Refill transmission fluid to the correct level.

4. Electrical Component Check

Inspect TCM and Wiring
- Examine the TCM for any signs of damage or corrosion.
- Ensure all connectors are securely attached.
- If necessary, replace the TCM with an OEM part.

5. Throttle Position Sensor Adjustment

Test and Replace TPS
- Use a multimeter to test the TPS for proper voltage output while moving the throttle.
- If readings are out of spec, replace the TPS as per the manufacturer's specifications.