U0017Medium Speed CAN Communication Bus (-) High
- Generic OBD-II code · Network
- How the car detects it
- U0017 means CAN-Low on the medium-speed CAN, the (-) wire, is held too high, as a rule by contact with battery or another supply voltage. On a differential bus of the high-speed type this short is fatal for traffic: the line cannot be pulled down, no dominant bit appears, and onsemi and NXP both class it among the shorts that make transmission impossible. All body and comfort modules on the segment drop out at once, the gateway records missing messages, and functions such as climate control, locking or the radio may stop responding until the short is removed. No manufacturer documents U0017 publicly; the analogy rests on Saab's terminated two-wire mid-speed GMLAN. With ignition on, CAN-Low near battery voltage confirms the fault.
- What you may notice
- All comfort and infotainment modules out at once
- Climate, locking or radio not responding
- Likely causes
- LikelyMedium-speed CAN-Low chafed against a supply wire
- PossibleMoisture or bent pin linking CAN-Low to a supply contact
- RareAccessory wiring connected to the comfort bus by mistake
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.