my Ford Explorer has a hard shift when accelerating what’s wrong

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

519 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 hard shifting issues in the 2015 Ford Explorer's transmission. 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

•Hard shift felt when accelerating
•Slipping transmission during gear changes
•Delayed engagement when shifting from park to drive
•Check engine light may be illuminated
•Unusual noises during shifting (e.g., clunking or grinding)
•Decreased fuel efficiency

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify transmission-related trouble codes.
2
Check the transmission fluid level and condition; low or dirty fluid can cause shifting issues.
3
Inspect the transmission filter for clogs or restrictions.
4
Examine the transmission control module (TCM) for proper function and any software updates.
5
Test drive the vehicle to replicate the hard shifting and observe under different conditions (e.g., cold vs. warm).
6
Inspect for any visible leaks around the transmission and associated components.

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
•Drain pan
•Transmission fluid pump

Parts Required

•Transmission fluid (Ford Mercon LV)
•Transmission filter
•Transmission pan gasket

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify transmission-related trouble codes.
2
Check the transmission fluid level and condition; low or dirty fluid can cause shifting issues.
3
Inspect the transmission filter for clogs or restrictions.
4
Examine the transmission control module (TCM) for proper function and any software updates.
5
Test drive the vehicle to replicate the hard shifting and observe under different conditions (e.g., cold vs. warm).
6
Inspect for any visible leaks around the transmission and associated components.

Solution

1. Preparation

Gather tools and materials needed.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the battery to ensure safety.

2. Check and Replace Transmission Fluid

Locate the transmission dipstick: Remove the dipstick and check fluid level. If low, add the recommended transmission fluid type (Ford Mercon LV).
Inspect fluid condition: If the fluid is dark or has a burnt smell, it needs to be replaced.
Drain old fluid: Position a drain pan under the transmission pan and remove the drain plug. Allow fluid to fully drain.
Replace filter: Remove the transmission pan by loosening the bolts (use a torque wrench for proper reassembly). Replace the old filter with a new one.
Reinstall transmission pan: Clean the mating surface and install a new gasket. Torque the bolts to the manufacturer's specifications.

3. Diagnose and Reprogram TCM (if applicable)

Reconnect the battery: Ensure all electrical connections are secure.
Use the diagnostic scanner: Re-check for any error codes. If the TCM is flagged, proceed to reprogram or replace it as necessary.
Perform a TCM reset: Follow the manufacturer’s procedure to reset the TCM, which may involve specific sequences of key turns or pedal presses.