how to troubleshoot CAN bus communication errors in Tesla Outback 5th Generation (2015-2019)

Subaru Outback 5th Generation (2015-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

533 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 Tesla Outback 5th Generation (2015-2019). Step-by-step guide with diagnostic 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.
•Allow the vehicle to cool down before inspecting components to avoid burns.

Symptoms

•Check engine light illuminated
•Inoperative dashboard gauges
•Malfunctioning infotainment system
•Random warning lights appearing
•Poor performance of electronic features

Diagnostic Steps

1
Scan the vehicle's OBD-II system for error codes using a compatible scanner to identify any DTCs.
2
Inspect the CAN bus wiring harness visually for any signs of damage, corrosion, or loose connections.
3
Use a multimeter to check the voltage levels on the CAN high and CAN low wires to ensure they are within specifications.
4
Measure the resistance between the CAN high and low wires; it should be around 60 ohms.
5
Isolate each module on the CAN bus by disconnecting them one at a time and checking if the error persists.
6
Check for software updates for the vehicle's control modules that may address known communication issues.

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
•Socket set
•Wire strippers and crimpers
•Soldering iron

Parts Required

•Replacement wiring
•Connectors

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Diagnostic Steps

1
Scan the vehicle's OBD-II system for error codes using a compatible scanner to identify any DTCs.
2
Inspect the CAN bus wiring harness visually for any signs of damage, corrosion, or loose connections.
3
Use a multimeter to check the voltage levels on the CAN high and CAN low wires to ensure they are within specifications.
4
Measure the resistance between the CAN high and low wires; it should be around 60 ohms.
5
Isolate each module on the CAN bus by disconnecting them one at a time and checking if the error persists.
6
Check for software updates for the vehicle's control modules that may address known communication issues.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to ensure electrical safety.
Prepare the workspace with adequate lighting and ventilation.

2. Inspect and Repair Wiring Harness

Sub-steps:
1. Carefully remove any protective coverings from the CAN bus wiring harness.
2. Inspect each wire for physical damage, fraying, or corrosion.
3. Repair or replace any damaged wiring using appropriate connectors and soldering techniques.
4. Secure the wiring harness back in place to prevent future damage.

3. Reconnect and Test Modules

Sub-steps:
1. Reconnect all modules that were previously disconnected during diagnostics.
2. Reconnect the battery and turn the ignition to the "ON" position without starting the engine.
3. Use the OBD-II scanner to clear any existing codes from the system.
4. Start the engine and monitor for any reoccurring DTCs or symptoms.

4. Update Control Modules

Sub-steps:
1. Connect the vehicle to a compatible diagnostic tool that can perform software updates.
2. Follow the manufacturer's instructions to check for and install any available updates for all control modules.
3. After updates, clear DTCs and retest the vehicle for proper CAN bus communication.