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

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

Error Codes

3-5 hours

Time

medium

Difficulty

high

Severity

Error Code: P0700-P0799

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

Important safety information - read before proceeding

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

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
•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

Related Faults

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Diagnostic Steps

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

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.