U0095Vehicle Communication Bus H (+) Low
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- U0095 indicates that the (+) wire of Vehicle Communication Bus H is held too low, usually through a ground short (CAN-High on a CAN). No public manufacturer document uses U0095. The effect depends heavily on the bus type. On a high-speed CAN, onsemi found that no frame can be sent with CAN-High grounded; the stuck node kept retrying in short bursts, its transmit line active only about 2 % of the time, and the supply current fell to about 50 mA. Repeated failures end in bus off, which would add U007A. NXP's fault-tolerant TJA1055, by contrast, copes with a grounded CANH without even leaving differential reception. The same code can therefore mean a dead network on one car and an unnoticed defect on another.
- What you may notice
- On high-speed CAN: all Bus H modules fail together
- On fault-tolerant CAN: little or no noticeable effect
- Likely causes
- Likely(+) wire chafed against the body
- PossibleHarness pinched during a repair or installation
- RareFaulty transceiver holding the (+) line low
- Repair
- Hard · Usually a job for a workshop.Typical cost: €60 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.