Data Link Communication Error
There is a problem with communication on the data link of the vehicle.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The truck's computer can't talk properly to one of the modules because of a broken wire, poor connector, or a failed module that’s making it hard to share information around.
What the computer is actually seeing
The ECM detects a loss of communication from a specific module on the data link, which is supposed to send and receive messages every few milliseconds.
What a healthy reading looks like
Modules should communicate every 10-20 milliseconds without interruption under normal operation.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the wiring harness and connectors associated with the affected module for any signs of damage or corrosion. If found, repair or replace as necessary. Decision point: Did you find and fix any issues? Yes - clear codes, test drive. No - continue to step 2.
- 22. Use a scan tool to verify if the affected module is recognized by the ECM. If the module is not listed, suspect a faulty module or loss of power to it. Decision point: Is the module visible on the scan tool? Yes - go to step 3. No - check power and ground to the module, repair as needed.
- 33. Inspect for any other communication faults by scanning for additional codes. Clear codes and test drive. Decision point: Are more codes present after test drive? Yes - troubleshoot those codes individually. No - issue resolved.
Common causes
- Loose or corroded connectors
- Damaged wiring harness
- Faulty electronic control module (ECM)
- Failed sensor or actuator connected to the bus
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's advisable to fix it soon as communication issues can lead to more severe problems or loss of vehicle functions.
Will clearing the code fix the problem?
Clearing the code may temporarily remove the warning, but if the underlying communication issue isn't resolved, it will return.
Why does this code pair with other communication codes?
Multiple codes indicate that several modules are not communicating well, usually due to a common wiring issue or bus fault.
Working a real vehicle right now?
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