U0014Medium Speed CAN Communication Bus (+) High
- Generic OBD-II code · Network
- How the car detects it
- U0014 means CAN-High of the medium-speed bus lies above its normal range, most often because the (+) wire touches battery voltage. On a differential CAN of the high-speed type this is a fault the network rides through: onsemi and NXP found frames still being delivered, but with shifted levels, reduced noise margin and higher current draw in the transceivers. NXP calls such a short hidden because only transceivers with built-in diagnosis notice it. On the comfort bus the result tends to be subtle: an occasional unresponsive switch, a flickering display or a stored code without complaint. No manufacturer documents U0014 publicly, and Saab's description shows only the two-wire terminated layout that makes this analogy plausible. A CAN-High reading close to battery voltage with ignition on confirms the short.
- What you may notice
- Occasional unresponsive switches or flickering displays
- Stored code without obvious malfunction
- Likely causes
- LikelyMedium-speed CAN-High rubbing against a supply wire
- PossibleMoisture in a door or roof connector linking CAN-High to plus
- RareAftermarket device wired to the comfort bus incorrectly
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.