my Ford Explorer's transmission slips when shifting gears, what's wrong?

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 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 issues in Ford Explorer. 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

•Allow the engine to cool before working on the transmission.
•Use caution when lifting the vehicle and ensure it is secure on jack stands.

Symptoms

•Transmission slipping during acceleration
•Delayed or harsh shifting between gears
•Engine RPMs increasing without corresponding vehicle speed
•Check engine light illuminated
•Fluid leaks under the vehicle
•Unusual noises (grinding or whining) from the transmission area

Diagnostic Steps

1
Check the transmission fluid level and condition using the dipstick; look for discoloration or burnt smell.
2
Scan for any error codes using an OBD-II scanner to identify potential electronic faults.
3
Inspect the transmission fluid for contamination or debris.
4
Examine the transmission filter for clogs or restrictions.
5
Test the transmission solenoids and electrical connections for proper function.
6
Conduct a road test to observe shifting behavior under different driving conditions.

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
•Funnel

Parts Required

•Transmission fluid (Mercon LV)
•Transmission filter
•Gasket for the transmission pan
•Transmission solenoids (if applicable)

Related Faults

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Diagnostic Steps

1
Check the transmission fluid level and condition using the dipstick; look for discoloration or burnt smell.
2
Scan for any error codes using an OBD-II scanner to identify potential electronic faults.
3
Inspect the transmission fluid for contamination or debris.
4
Examine the transmission filter for clogs or restrictions.
5
Test the transmission solenoids and electrical connections for proper function.
6
Conduct a road test to observe shifting behavior under different driving conditions.

Solution

1. Preparation

Gather tools and parts required for the repair.
Ensure the vehicle is on a level surface and secure it with jack stands.
Disconnect the negative battery terminal to avoid electrical issues.

2. Check and Change Transmission Fluid

Sub-steps:
1. Remove the transmission dipstick and check fluid level.
2. If fluid is low, add the appropriate type of transmission fluid (consult owner’s manual).
3. If fluid is burnt or contaminated, proceed to change the fluid.
Tools Required:
- Funnel
- Transmission fluid (specific type for Ford Explorer, e.g., Mercon LV)

3. Replace Transmission Filter

Sub-steps:
1. Remove the transmission pan by loosening bolts with a socket set.
2. Carefully lower the pan to prevent spilling fluid.
3. Remove the old filter and install the new one, ensuring it clicks into place.
4. Clean the transmission pan and replace the gasket before reattaching it.
Tools Required:
- Socket set
- Torque wrench

4. Inspect Transmission Solenoids

Sub-steps:
1. Locate the transmission solenoids (usually found externally on the valve body).
2. Disconnect the electrical connectors and remove the solenoids.
3. Test the solenoids using a multimeter for resistance and functionality.
4. Replace any faulty solenoids with new ones.
Tools Required:
- Multimeter
- Torque wrench