Data Link Data Error
This code indicates a communication error on the data link.
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 vehicle's computer is having trouble communicating with one of its systems, like the engine control module (ECM) or transmission control module (TCM).
What the computer is actually seeing
The computer sees inconsistent or faulty data signals on the data link; it monitors for status changes and doesn’t get expected responses.
What a healthy reading looks like
Normal voltage should be between 0.5V and 4.5V on the data pins during communication, and expected response time for signals is less than 20ms.
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 and connectors for any visible damage or corrosion. If damaged, repair or replace.
- 22. Measure voltage on the data link connection - it should be between 0.5V and 4.5V. If not, focus on power and ground supply.
- 33. Inspect all related control modules and ensure they can communicate. Use a scan tool to check for codes from other modules.
- 44. Test the integrity of the data link itself with a known good vehicle. If the issue persists, consider faults in the ECU or TCU.
Common causes
- Faulty wiring or connectors in the data link
- Water ingress or corrosion in connectors
- Faulty control module (ECM/TCM)
- Unprogrammed or mismatched modules
- Bad or weak battery affecting communications
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended as it may lead to further system malfunctions and could affect drivability.
Will this code come back after I clear it?
It may reappear if the underlying issue isn't fixed; addressing wiring or module faults should help.
Why does this code pair with other SPNs?
Communication errors can affect multiple modules, leading to cross-reported faults.
Working a real vehicle right now?
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