High Speed CAN Communication Error
There's an issue with the communication over the high-speed CAN bus.
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 systems use a network called CAN bus to talk to each other; if something goes wrong, like a broken wire, they can't share info properly. This could be due to damaged wiring or a faulty electronic module.
What the computer is actually seeing
The computer detects that the high-speed CAN is not communicating as expected, typically indicated by missing or erroneous messages from connected modules.
What a healthy reading looks like
Normal CAN bus communication requires a voltage signal between 2.5V to 2.7V when idle and less than 1V (dominant state) during active communication.
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. Inspect the wiring harness for visible damage or frays.
- 22. Check all connectors for corrosion or loose connections; clean or tighten if necessary.
- 33. Use a multimeter to test the CAN bus voltages; confirm idle is between 2.5V to 2.7V.
- 44. If voltages are off, isolate the components connected to the CAN; disconnect one at a time to localize the fault.
- 55. Test the suspected faulty module if voltages are normal; confirm it responds to diagnostics.
Common causes
- Damaged wiring harness
- Faulty ECM or other connected modules
- Poor connections at connectors
- Electrical interference from other components
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable, but you may experience issues with vehicle functionality until it's fixed.
Will this code come back after clearing it?
Yes, if the underlying issue isn't addressed, the code is likely to return.
Why does this code relate to other SPN codes?
Related SPN codes often indicate issues with different modules communicating over the same network.
Working a real vehicle right now?
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