my Toyota Corolla E170 (2013-2019) transmission slips when shifting gears, what’s wrong?

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

546 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix transmission slippage in Toyota Corolla E170 (2013-2019). 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 components.
•Allow the vehicle to cool before working on the transmission to avoid burns.

Symptoms

•Transmission slips during gear shifts
•Unusual high RPMs without corresponding acceleration
•Delayed engagement when shifting from park to drive
•Warning lights illuminated on the dashboard (e.g., check engine light)
•Fluid leaking under the vehicle
•Erratic or harsh shifting

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related fault codes.
2
Check the transmission fluid level and condition (color and smell).
3
Inspect for any visible transmission fluid leaks around seals and gaskets.
4
Test the transmission fluid pressure using a pressure gauge.
5
Inspect the transmission filter for clogs or blockages.
6
Check the condition of the transmission mount for excessive play or damage.

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
•Funnel
•Drain pan
•Socket set
•Torque wrench
•Pressure gauge

Parts Required

•Transmission fluid (ATF WS)
•Transmission filter
•Gasket for transmission pan
•Transmission mounts (if needed)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related fault codes.
2
Check the transmission fluid level and condition (color and smell).
3
Inspect for any visible transmission fluid leaks around seals and gaskets.
4
Test the transmission fluid pressure using a pressure gauge.
5
Inspect the transmission filter for clogs or blockages.
6
Check the condition of the transmission mount for excessive play or damage.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and is secure.
Disconnect the battery to prevent electrical issues during repairs.

2. Check and Replace Transmission Fluid

Tools Required: Funnel, drain pan, socket set.
Sub-steps:
1. Locate the transmission fluid dipstick and remove it to check the fluid level.
2. If fluid is low or dirty (burnt smell or dark color), drain the transmission fluid into a pan.
3. Replace the old fluid with the manufacturer-recommended type (usually ATF WS for Toyota).
4. Reinsert the dipstick and check the fluid level again, adding more fluid as necessary.

3. Replace Transmission Filter

Tools Required: Socket set, new transmission filter, gasket, torque wrench.
Sub-steps:
1. Remove the transmission pan using a socket set, being careful to catch any remaining fluid.
2. Remove the old filter from the transmission and install the new filter, ensuring a proper seal.
3. Clean the transmission pan and install a new gasket.
4. Reattach the transmission pan and torque bolts to the manufacturer's specification.

4. Inspect and Tighten Transmission Mounts

Tools Required: Socket set, torque wrench.
Sub-steps:
1. Locate the transmission mounts and inspect for any visible signs of wear or damage.
2. If the mounts are loose, tighten them to the manufacturer's torque specifications.
3. If damaged, replace the transmission mounts.

5. Test Drive

After completing repairs, reconnect the battery and take the vehicle for a test drive to ensure proper operation.