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Home/Cars/Ford/F-150/13th Generation (2015-2020)/how to troubleshoot transmission codes P0700-P0799 on Ford F-150

how to troubleshoot transmission codes P0700-P0799 on Ford F-150

Ford F-150 13th Generation (2015-2020)

Error Codes
Severity: highDifficulty: mediumError Code: P0700-P07993-5 hours
3 min read
540 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 troubleshoot and fix P0700-P0799 transmission codes on Ford F-150. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0700-P0799
Affected Component
Transmission
Estimated Time
3-5 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow the engine and transmission to cool before servicing.

Symptoms

  • •Check engine light illuminated
  • •Harsh or erratic shifting
  • •Slipping transmission
  • •Delayed engagement when shifting from park to drive
  • •Transmission overheating
  • •Decreased fuel efficiency

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm P0700 and related codes.
  2. 2Inspect the transmission fluid level and condition; check for burnt odor or metal particles.
  3. 3Examine the transmission wiring harness and connectors for any signs of damage or corrosion.
  4. 4Check the transmission control module (TCM) for proper function and any stored fault codes.
  5. 5Test the input and output speed sensors for proper operation using a multimeter.
  6. 6Inspect the transmission filters for blockage or contamination.
  7. 7Verify the vehicle's battery and charging system to ensure proper voltage supply to the transmission control system.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Ensure the vehicle is parked on a level surface and safely secured.
  • Disconnect the battery to prevent electrical shorts.

2. Check and Replace Transmission Fluid

  • Remove the transmission dipstick and check fluid level; add the manufacturer-recommended fluid if low.
  • If the fluid is burnt or contaminated, drain the transmission fluid using a fluid pump.
  • Replace with the specified transmission fluid (e.g., Mercon V for Ford F-150).
  • Recheck fluid levels after replacing and run the vehicle to circulate.

3. Inspect and Repair Wiring and Connectors

  • Examine the wiring harness leading to the TCM and transmission sensors.
  • Repair or replace any damaged wires or corroded connectors.
  • Use electrical cleaner on connectors to ensure good contact.

4. Test and Replace Sensors

  • Using a multimeter, test the input and output speed sensors for voltage output.
  • If sensors are faulty, remove them and replace with new ones, ensuring proper installation.
  • Clear any fault codes after sensor replacement.

5. Inspect and Replace Transmission Filter

  • Remove the transmission pan using a socket set.
  • Take out the old filter and replace it with a new one.
  • Reinstall the transmission pan with new gasket and torque to manufacturer specifications.

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
  • •Multimeter
  • •Fluid pump
  • •Torque wrench

Parts Required

  • •Transmission fluid (e.g., Mercon V)
  • •Transmission filter
  • •Input and output speed sensors (if necessary)
  • •Gasket for the transmission pan

Additional Information

Error Code
P0700-P0799
Affected Component
Transmission
Estimated Time
3-5 hours
Difficulty
medium
Severity
high
Tools Required
5 items
Parts Required
4 items

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