how to troubleshoot Ford F-150 13th Generation (2015-2020) CAN bus communication errors

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

576 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 CAN bus communication errors in Ford F-150 (2015-2020). Step-by-step guide with diagnostic steps and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent short circuits.
•Ensure the vehicle is in park with the parking brake applied during inspection.

Symptoms

•Check engine light illuminated
•Instrument cluster malfunction (e.g., gauges not functioning)
•Error messages displayed on the dashboard
•Inoperative electronic features (e.g., radio, windows)
•Difficulty in starting the vehicle
•Random or intermittent electrical issues

Diagnostic Steps

1
Scan the vehicle using an OBD-II scanner to retrieve any error codes related to the CAN bus.
2
Inspect the vehicle battery and charging system for proper voltage and connections.
3
Check all fuses related to the CAN bus communication system for any blown fuses.
4
Inspect wiring and connectors for damage or corrosion, particularly in the areas leading to the Engine Control Module (ECM) and Body Control Module (BCM).
5
Perform a continuity test on the CAN bus wiring using a multimeter.
6
Verify that the modules on the CAN bus (e.g., ECM, BCM, ABS) are functioning correctly and are communicating with each other.

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
•Fuse puller
•Wire brush
•Basic hand tools (screwdrivers, socket set)

Parts Required

•Replacement fuses (if any are blown)
•Wiring harness or connectors (if repairs are needed)

Related Faults

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Diagnostic Steps

1
Scan the vehicle using an OBD-II scanner to retrieve any error codes related to the CAN bus.
2
Inspect the vehicle battery and charging system for proper voltage and connections.
3
Check all fuses related to the CAN bus communication system for any blown fuses.
4
Inspect wiring and connectors for damage or corrosion, particularly in the areas leading to the Engine Control Module (ECM) and Body Control Module (BCM).
5
Perform a continuity test on the CAN bus wiring using a multimeter.
6
Verify that the modules on the CAN bus (e.g., ECM, BCM, ABS) are functioning correctly and are communicating with each other.

Solution

1. Preparation

Gather tools and components required for the repair.
Disconnect the negative terminal of the battery to prevent accidental short circuits.
Ensure the vehicle is parked on a flat surface and the ignition is off.

2. Battery and Connections Check

Sub-steps:
1. Use a multimeter to measure the battery voltage; it should read between 12.4V and 12.7V when the engine is off.
2. Clean the battery terminals and cable connections using a wire brush if corrosion is present.
3. Reconnect the battery terminals securely.

3. Fuse Inspection

Sub-steps:
1. Locate the fuse box in the engine compartment and the passenger compartment.
2. Use a fuse puller to remove fuses related to the CAN bus (refer to the owner’s manual for specific fuse locations).
3. Inspect each fuse visually and with a multimeter for continuity; replace any blown fuses with the correct amperage rating.

4. Wiring Inspection

Sub-steps:
1. Visually inspect the CAN bus wiring for any signs of fraying, cuts, or corrosion.
2. Use a multimeter to check for continuity in the CAN bus wires (typically twisted pairs).
3. If damaged wiring is found, repair or replace the affected sections using proper electrical connectors.

5. Module Communication Check

Sub-steps:
1. Reconnect the battery terminal after all checks are complete.
2. Use a scan tool to check for communication between the modules.
3. If a particular module is not communicating, it may need replacement or further diagnosis.