my Ford Explorer transmission slips when accelerating what's wrong

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

533 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 slipping during acceleration in Ford Explorer. Step-by-step guide with diagnostic procedures 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 to cool before opening the transmission.

Symptoms

•Transmission slips during acceleration
•Unresponsive or delayed shifting
•Engine revs higher without corresponding increase in speed
•Check engine light may be illuminated
•Fluid leaks under the vehicle
•Burning smell from the transmission

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related trouble codes.
2
Check the transmission fluid level and condition; look for discoloration or burnt odor.
3
Inspect the transmission fluid for leaks by examining seals and gaskets.
4
Perform a road test to observe the behavior of the transmission under different conditions.
5
Check the transmission filter; a clogged filter can restrict fluid flow.
6
Inspect the throttle position sensor for proper operation, as it affects shifting.

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
•Seal puller
•Drain pan

Parts Required

•Transmission fluid
•Transmission filter
•Gasket for transmission pan
•Seals (input/output 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 trouble codes.
2
Check the transmission fluid level and condition; look for discoloration or burnt odor.
3
Inspect the transmission fluid for leaks by examining seals and gaskets.
4
Perform a road test to observe the behavior of the transmission under different conditions.
5
Check the transmission filter; a clogged filter can restrict fluid flow.
6
Inspect the throttle position sensor for proper operation, as it affects shifting.

Solution

1. Preparation

Gather tools and parts required for the repair.
Disconnect the battery to prevent electrical shorts.
Ensure the vehicle is on a level surface and raise it using jack stands for safety.

2. Check Transmission Fluid

Remove the transmission dipstick and wipe it clean.
Reinsert the dipstick and remove it again to check the fluid level; add fluid if low (use manufacturer-recommended type).
Check the fluid for contaminants; if dirty or burnt, a fluid change is necessary.

3. Replace Transmission Filter

Drain the transmission fluid by removing the drain plug or pan.
Remove the transmission pan using a socket set, ensuring to catch any fluid in a pan.
Replace the old filter with a new one; ensure the new filter is seated properly.
Clean the transmission pan and replace the gasket as needed, then reattach the pan.

4. Inspect and Replace Seals (if necessary)

Inspect the transmission input and output seals for leaks.
If seals are worn or damaged, carefully remove them using a seal puller.
Install new seals, applying a small amount of transmission fluid to the sealing surface.

5. Refill Transmission Fluid

After all repairs, refill the transmission with the correct type and amount of fluid as specified in the owner’s manual.
Start the engine and let it idle for a few minutes, then check fluid levels again and add as necessary.