how to fix the CAN bus communication errors on my Ford Explorer Fifth Generation (2011-2019)

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

514 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 CAN bus communication errors in Ford Explorer (2011-2019). Step-by-step guide with symptoms, 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 avoid short circuits or shock.

Symptoms

•Check engine light illuminated
•Malfunctioning dashboard gauges
•Inconsistent operation of electrical components (e.g., windows, locks)
•Warning messages displayed on the instrument cluster
•Difficulty in starting the vehicle
•Communication errors when scanning with an OBD-II scanner

Diagnostic Steps

1
Scan the vehicle's computer systems using an OBD-II scanner to identify specific error codes.
2
Inspect the CAN bus wiring harness for any visible damage, corrosion, or loose connections.
3
Check the vehicle's ground connections for integrity and corrosion.
4
Verify voltage and continuity on the CAN bus wires using a multimeter.
5
Inspect related modules (e.g., ECM, BCM) for signs of failure or internal faults.
6
Perform a network test to check for communication between different modules.

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
•Wire cutter/stripper
•Socket set
•Soldering iron (if necessary)
•Wire brush

Parts Required

•Replacement wiring harness (if damaged)
•Replacement modules (if faulty)

Related Faults

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Diagnostic Steps

1
Scan the vehicle's computer systems using an OBD-II scanner to identify specific error codes.
2
Inspect the CAN bus wiring harness for any visible damage, corrosion, or loose connections.
3
Check the vehicle's ground connections for integrity and corrosion.
4
Verify voltage and continuity on the CAN bus wires using a multimeter.
5
Inspect related modules (e.g., ECM, BCM) for signs of failure or internal faults.
6
Perform a network test to check for communication between different modules.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to ensure safety while working on electrical systems.

2. Inspect and Repair Wiring

Sub-steps:
- Remove any under-dash panels to access the CAN bus wiring.
- Visually inspect the wiring harness for cuts, frays, or signs of wear.
- Use a multimeter to check for continuity in the CAN high and CAN low wires.
- Repair any damaged wires using appropriate connectors or splices.
Tools Required: Wire cutter/stripper, multimeter, soldering iron (if necessary).

3. Check and Clean Ground Connections

Sub-steps:
- Locate ground points related to the CAN bus system.
- Remove the ground connections and clean them with a wire brush or sandpaper.
- Reattach the grounds securely and apply dielectric grease to prevent future corrosion.
Tools Required: Socket set, wire brush, dielectric grease.

4. Test and Replace Faulty Modules

Sub-steps:
- If diagnostics indicate module failures, remove the affected module (e.g., ECM or BCM).
- Inspect the module connectors for corrosion or damage.
- Replace the module with a new one if necessary, ensuring it is programmed correctly for the vehicle.
Tools Required: Socket set, OBD-II scanner for programming.

5. Reconnect Battery and Test

Sub-steps:
- Reconnect the battery terminals securely.
- Start the vehicle and scan for error codes again to ensure no communication errors remain.