why does my Ford Explorer's transmission slip when accelerating

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

559 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 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 battery before working on electrical systems.
•Allow engine to cool before opening the transmission pan.

Symptoms

•Engine RPM increases without corresponding vehicle speed increase
•Delayed or harsh shifting between gears
•Unusual noises (such as whining or grinding) when accelerating
•Check engine light illuminated on the dashboard
•Fluid leaks under the vehicle

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related issues.
2
Check transmission fluid level and condition; look for signs of contamination or burning.
3
Inspect the transmission for external leaks or damage to seals and gaskets.
4
Evaluate the condition of the transmission filter and replace if it appears clogged or dirty.
5
Test the throttle position sensor (TPS) and mass airflow sensor (MAF) for proper operation.
6
Examine the wiring and connectors related to the transmission control module (TCM) for corrosion 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
•Socket set
•Fluid catch pan
•Funnel
•Torque wrench
•Multimeter

Parts Required

•New transmission fluid
•Transmission filter kit
•New seals

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related issues.
2
Check transmission fluid level and condition; look for signs of contamination or burning.
3
Inspect the transmission for external leaks or damage to seals and gaskets.
4
Evaluate the condition of the transmission filter and replace if it appears clogged or dirty.
5
Test the throttle position sensor (TPS) and mass airflow sensor (MAF) for proper operation.
6
Examine the wiring and connectors related to the transmission control module (TCM) for corrosion or damage.

Solution

1. Preparation

Gather tools and materials:
- Tools: OBD-II scanner, socket set, fluid catch pan, funnel, torque wrench, multimeter.
- Parts: New transmission fluid, transmission filter kit, new seals.
Ensure the vehicle is parked on a level surface and the engine is off.
Allow the engine to cool if it has been running.

2. Change Transmission Fluid

Drain Fluid:
- Locate the transmission pan and remove the bolts using a socket set.
- Position a fluid catch pan under the pan and slowly remove it to let the old fluid drain completely.
Replace Filter:
- Remove the old transmission filter from the valve body.
- Install the new filter, ensuring it is seated properly.
Clean Pan:
- Clean the transmission pan thoroughly to remove any debris or sludge.
- Inspect the magnet in the pan for metal shavings and clean if necessary.
Reassemble:
- Install a new gasket on the transmission pan.
- Reattach the transmission pan and torque the bolts to manufacturer specifications (typically around 10-12 ft-lbs).
Refill Fluid:
- Use a funnel to fill the transmission with the appropriate type of new fluid (check the owner’s manual for specifications).
- Start the engine and cycle through the gears to allow the fluid to circulate.

3. Test Drive

Check Fluid Level:
- After the test drive, check the transmission fluid level again and top off as needed.
Monitor Performance:
- During the test drive, pay attention to shifting quality and any noises from the transmission.