why does my Ford Explorer Fifth Generation (2011-2019) transmission slip when accelerating

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

578 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 (2011-2019). Step-by-step guide with symptoms, diagnostics, 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 radiator or accessing components.

Symptoms

•Transmission slips during acceleration
•Engine RPM increases without corresponding vehicle speed
•Harsh or delayed shifting between gears
•Check engine light may illuminate
•Fluid leaks under the vehicle
•Unusual noises such as grinding or whining from the transmission

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 the transmission fluid for signs of contamination or burning.
4
Examine the transmission pan for leaks or damage.
5
Test the throttle position sensor (TPS) for proper operation.
6
Perform a road test to observe shifting patterns and RPM behavior.

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
•Fluid pump
•Socket set
•Torque wrench
•Multimeter

Parts Required

•Transmission fluid (Mercon LV)
•Transmission filter (if applicable)
•Gasket for transmission pan (if needed)
•Throttle position sensor (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 the transmission fluid for signs of contamination or burning.
4
Examine the transmission pan for leaks or damage.
5
Test the throttle position sensor (TPS) for proper operation.
6
Perform a road test to observe shifting patterns and RPM behavior.

Solution

1. Preparation

Gather tools and parts needed for repair.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the battery to eliminate electrical hazards.

2. Check and Replace Transmission Fluid

1.1 Locate the transmission dipstick (if equipped) or access the fill plug.
1.2 Remove the dipstick or fill plug and check fluid level; add fluid if low.
1.3 If fluid is dirty or smells burnt, drain the transmission fluid using a fluid pump or drain plug.
1.4 Replace with the manufacturer-recommended transmission fluid (usually Mercon LV for Ford).
1.5 Refill the transmission with the correct amount of new fluid, checking the level as you go.

3. Inspect and Replace Transmission Filter (if applicable)

3.1 Remove the transmission pan by loosening the bolts (ensure to catch any remaining fluid).
3.2 Inspect the filter; replace it if clogged or dirty.
3.3 Clean the transmission pan and magnet, if present, of any debris.
3.4 Reinstall the new filter according to manufacturer specifications.

4. Test and Adjust Throttle Position Sensor

4.1 Disconnect the TPS connector and test it with a multimeter.
4.2 Verify that the voltage readings change smoothly as the throttle is opened and closed.
4.3 If the TPS is faulty, replace it with a new one and reconnect.

5. Reconnect Battery and Perform Road Test

5.1 Reconnect the battery and start the engine.
5.2 Shift through all transmission gears, ensuring smooth engagement.
5.3 Perform a road test to confirm that the slipping issue has been resolved.