Why does my Ford Explorer 2020 have a rough transmission shift?

Problem Diagnosis: Rough Transmission Shift in 2020 Ford Explorer

Symptoms:

1. Harsh or jarring feeling during gear changes.
2. Delayed engagement when shifting from park to drive or reverse.
3. Unusual noises during shifts (clunking or grinding).
4. Fluctuating RPMs during acceleration.

Step 1: Vehicle Preparation

• Tools Required:
  • OBD-II scanner
  • Digital multimeter
  • Torque wrench
  • Transmission fluid dipstick (if applicable)
  • Fluid transfer pump
  • Basic hand tools (ratchet, sockets, wrenches)

Step 2: Check for Diagnostic Trouble Codes (DTC)

1. Connect the OBD-II scanner to the vehicle's diagnostic port (usually under the dashboard).
2. Retrieve any stored trouble codes related to transmission performance.
3. Note any codes, particularly those related to the transmission control module (TCM) or engine control module (ECM).

Step 3: Inspect Transmission Fluid

1. If the vehicle is equipped with a dipstick, check the transmission fluid level and condition.
   • Fluid Condition: The fluid should be a bright red and should not have a burnt smell. If it is dark or smells burnt, it needs to be replaced.
2. If there is no dipstick, check the fluid level via the fill plug.
3. Inspect for any leaks beneath the vehicle.

Step 4: Inspect for Software Updates

1. Visit a Ford dealership or use the Ford service website to check for any software updates for the TCM. Sometimes, manufacturers release updates to improve shifting performance.

Step 5: Inspect the Transmission Control Module (TCM)

1. Visually inspect the TCM wiring harness for damage or loose connections.
2. Use a multimeter to check for proper voltage at the TCM connectors.

Step 6: Check for Mechanical Issues

1. Inspect the transmission mounts for wear or damage, which can cause shifts to feel rough.
2. Check for any leaks around the transmission housing or bell housing.

Repair Instructions

Step 1: Change Transmission Fluid and Filter

1. If the transmission fluid is low or contaminated:
   • Place the vehicle on a level surface and raise it using a jack and jack stands.
   • Position a drain pan under the transmission fluid pan.
   • Remove the transmission pan bolts using a socket wrench (torque specs available in the service manual).
   • Carefully lower the pan to drain the old fluid.
   • Replace the transmission filter (if equipped) and clean the pan thoroughly.
   • Reinstall the pan with new gasket and torque the bolts to the specified torque (usually around 10-12 lb-ft).
   • Refill with the recommended transmission fluid using a fluid transfer pump.

Step 2: Update TCM Software

1. If an update is available for the TCM:
   • Connect the vehicle to Ford's diagnostic tool at a dealership or authorized repair facility.
   • Follow the prompts to update the software.

Step 3: Repair or Replace TCM

1. If the TCM is faulty:
   • Remove the TCM as per the service manual (usually involves disconnecting battery, removing connectors, and unbolting).
   • Install the new or refurbished TCM and reconnect all wiring.
   • Clear codes and test drive to confirm shifting improvement.

Step 4: Inspect and Replace Transmission Mounts (if necessary)

1. If mounts are damaged:
   • Use a socket wrench to remove the bolts securing the transmission mount.
   • Replace with new mounts and tighten to specifications.

Conclusion

After performing the above steps, test drive the vehicle to ensure that the rough shifting issue is resolved. If problems persist, further diagnosis may be required, potentially involving more in-depth inspections of the internal transmission components or the entire transmission system.