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how to fix the trailer brake controller not working on Ford F-150 13th Generation (2015-2020) - Ford F-150
Home/Cars/Ford/F-150/13th Generation (2015-2020)/how to fix the trailer brake controller not working on Ford F-150 13th Generation (2015-2020)

how to fix the trailer brake controller not working on Ford F-150 13th Generation (2015-2020)

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

Error Codes
1-2 hours
Time
medium
Difficulty
high
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
522 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 the trailer brake controller not working on Ford F-150 (2015-2020). Step-by-step guide with symptoms and solutions.

Affected Component
Brakes
Estimated Time
1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

  • •Disconnect the battery before working on electrical systems to prevent shocks.

Symptoms

  • •Trailer brake warning light illuminated on the dashboard
  • •Inability to adjust trailer brake settings via the controller
  • •Lack of braking response from the trailer brakes when applied
  • •Unusual noises from the trailer brakes (squealing or grinding)
  • •Check trailer brake system message displayed on the information screen

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6

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
  • •Multimeter
  • •Screwdriver
  • •Needle-nose pliers
  • •Fuse puller

Parts Required

  • •Replacement fuse (if needed)
  • •Trailer brake controller (if faulty)

Additional Information

Affected Component
Brakes
Estimated Time
1-2 hours
Difficulty
medium
Severity
high
Tools Required
5 items
Parts Required
2 items

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Solution
1. Preparation
  • Gather necessary tools and parts.
  • Disconnect the battery to avoid electrical shock and short circuits.
2. Inspect and Replace Fuse
  • Tools Required: Fuse puller or needle-nose pliers
  • Locate the fuse box under the dashboard and identify the fuse for the trailer brake controller.
  • Remove the fuse and inspect it for continuity. If blown, replace it with a fuse of the same amperage.
3. Check Electrical Connections
  • Tools Required: Screwdriver, multimeter
  • Remove the panel covering the trailer brake controller.
  • Inspect the wiring harness connected to the controller for any signs of damage.
  • Use a multimeter to check for continuity in the wiring. Repair any identified issues.
4. Test Trailer Brake Output
  • Tools Required: Multimeter
  • Reconnect the battery and power on the vehicle.
  • Set the multimeter to measure DC voltage. Connect the probes to the output terminals of the trailer brake controller.
  • Activate the trailer brake controller and check for the correct output voltage. If voltage is absent or incorrect, replace the brake controller.
5. Calibrate the Brake Controller
  • Follow the manufacturer’s instructions in the vehicle's owner manual to calibrate the trailer brake controller.
  • Adjust the settings according to the trailer specifications and test the braking response.