why is my Ford F-150 13th Generation (2015-2020) check engine light on with code P0700

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0700

3 min read

552 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 P0700 transmission control malfunction in Ford F-150 (2015-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0700

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 working near the transmission.

Symptoms

•Check engine light illuminated
•Possible rough shifting or hesitation during gear changes
•Slipping transmission
•Delayed engagement when shifting from park to drive or reverse
•Increased fuel consumption

Diagnostic Steps

1
Scan for additional error codes using an OBD-II scanner to determine if there are any related transmission codes.
2
Inspect transmission fluid level and condition; look for contamination or burnt smell.
3
Check the transmission wiring harness for loose connections or damage.
4
Inspect the transmission control module (TCM) for any signs of damage or corrosion.
5
Test the TCM functionality using a diagnostic tool to see if it responds to inputs correctly.
6
Perform a visual inspection of the transmission solenoids and check for proper operation.

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
•Transmission dipstick

Parts Required

•Transmission fluid (Mercon LV)
•Transmission control module (if replacement is necessary)

Related Faults

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Diagnostic Steps

1
Scan for additional error codes using an OBD-II scanner to determine if there are any related transmission codes.
2
Inspect transmission fluid level and condition; look for contamination or burnt smell.
3
Check the transmission wiring harness for loose connections or damage.
4
Inspect the transmission control module (TCM) for any signs of damage or corrosion.
5
Test the TCM functionality using a diagnostic tool to see if it responds to inputs correctly.
6
Perform a visual inspection of the transmission solenoids and check for proper operation.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to prevent electrical shorts.
Ensure the vehicle is on a level surface and securely supported with jack stands.

2. Check Transmission Fluid

Remove the transmission dipstick and wipe it clean.
Reinsert the dipstick and remove it again to check the fluid level.
If the fluid is low, add the manufacturer's recommended transmission fluid (e.g., Mercon LV for Ford vehicles).
If the fluid is dark or smells burnt, a transmission fluid change may be necessary.

3. Inspect Wiring and Connections

Visually inspect the transmission wiring harness for fraying, corrosion, or loose connections.
Reconnect any loose connectors and repair any damaged wiring using electrical tape or heat shrink tubing.

4. Test Transmission Control Module (TCM)

Using a diagnostic scanner, access the TCM data and check for any faults.
If the TCM is unresponsive or showing errors, it may need to be replaced.
If replacement is necessary, follow the next steps.

5. Replace Transmission Control Module (if needed)

Remove any components obstructing access to the TCM.
Disconnect the wiring harness from the TCM.
Unbolt the TCM from its mounting location using the appropriate socket.
Install the new TCM by reversing the removal steps and ensuring all connections are secure.

6. Reconnect Battery and Test Drive

Reconnect the negative battery terminal.
Start the engine and allow it to warm up.
Test drive the vehicle to ensure proper shifting and that the check engine light does not reappear.