my Ford Explorer transmission slips when accelerating what's wrong

Ford Explorer Fifth Generation (2011-2019)

Error Codes

3-5 hours

Time

medium

Difficulty

high

Severity

3 min read

521 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 symptoms, diagnostic steps, and repair instructions.

Affected Component

Transmission

Estimated Time

3-5 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before working on the transmission to avoid burns.

Symptoms

•Transmission slips during acceleration
•Engine revs without a corresponding increase in vehicle speed
•Delayed or rough shifting between gears
•Fluid leaks under the vehicle
•Check engine light may be illuminated

Diagnostic Steps

1
Check the transmission fluid level and condition using the dipstick.
2
Scan the vehicle's computer for any stored error codes using an OBD-II scanner.
3
Inspect the transmission fluid for contaminants or burnt smell.
4
Examine the transmission filter for clogs or blockages.
5
Test the vehicle's throttle position sensor (TPS) for proper function.
6
Inspect the transmission control module (TCM) for faults.

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

•Transmission funnel
•Container for old fluid
•Torque wrench
•OBD-II scanner
•Socket set
•Multimeter

Parts Required

•Transmission fluid (Mercon V or equivalent)
•Transmission filter
•Gasket for transmission pan (if applicable)

Related Faults

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Diagnostic Steps

1
Check the transmission fluid level and condition using the dipstick.
2
Scan the vehicle's computer for any stored error codes using an OBD-II scanner.
3
Inspect the transmission fluid for contaminants or burnt smell.
4
Examine the transmission filter for clogs or blockages.
5
Test the vehicle's throttle position sensor (TPS) for proper function.
6
Inspect the transmission control module (TCM) for faults.

Solution

1. Preparation

Gather all necessary tools and parts.
Park the vehicle on a level surface and engage the parking brake.
Disconnect the battery to ensure safety.

2. Check and Replace Transmission Fluid

Tools Required: Transmission funnel, container for old fluid, torque wrench.
Remove the transmission fluid dipstick and check the fluid level; add fluid if low.
If the fluid is dark or burnt, proceed to replace it.
Place a container under the transmission pan to catch old fluid.
Remove the transmission pan bolts with a socket set and carefully drop the pan.
Replace the old transmission fluid with new fluid as per manufacturer specifications (usually Mercon V or similar).
Torque the pan bolts to the manufacturer’s specifications.

3. Replace Transmission Filter

Remove the old filter from the transmission.
Install the new filter ensuring it is seated properly.
Reattach the transmission pan and the fluid dipstick.

4. Inspect and Test Electrical Components

Reconnect the battery.
Use a multimeter to check the resistance of the throttle position sensor, ensuring it is within specifications.
If the TPS is faulty, replace it according to manufacturer guidelines.

5. Reset TCM

After replacement and checks, disconnect the battery again for about 15 minutes to reset the transmission control module.
Reconnect the battery and start the vehicle to allow the TCM to relearn the transmission parameters.