how to diagnose Ford F-150 13th Generation (2015-2020) transmission slipping

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.
• Disconnect the battery to prevent electrical shorts during the process.

2. Check Transmission Fluid

• Tools Required: Transmission dipstick (if applicable), funnel, new transmission fluid.
• Remove the transmission dipstick (if equipped) and check fluid level.
• If fluid is low, add the appropriate type of transmission fluid as specified in the owner's manual.

3. Inspect and Replace Transmission Fluid

• Tools Required: Socket set, torque wrench, transmission fluid pump.
• Drain the old transmission fluid by removing the transmission pan bolts.
• Clean the transmission pan and replace the filter if applicable.
• Reinstall the pan and torque the bolts to the manufacturer specifications.
• Fill the transmission with new fluid as per the manufacturer's guidelines.

4. Test Shift Solenoids

• Tools Required: Multimeter.
• Disconnect the wiring harness from the shift solenoids.
• Measure the resistance across the terminals of each solenoid; compare with the specifications in the service manual.
• Replace any faulty solenoids if they are out of spec.

5. Reconnect Battery and Test Drive

• Reconnect the battery.
• Perform a test drive to monitor transmission behavior and verify that slipping has been resolved.