U0096Vehicle Communication Bus H (+) High
- Generic OBD-II code · Network
- How the car detects it
- U0096 is set once excessive voltage appears on the Bus H (+) wire, as from a short to battery or to the module supply; on a CAN this is CAN-High. U0096 is not documented by any manufacturer in public. On a high-speed CAN such a short often leaves traffic running; NXP lists CAN-High to battery and to the 5 V supply among hidden failures. A fault-tolerant low-speed CAN reacts in steps. NXP's TJA1055 first switches to single-wire reception over CANH after a time-out and, if the line stays high, moves on to CANL and shuts off its CANH driver; the delays keep radio interference from triggering it. When the short is gone, the chip returns to normal by itself. Look for chafing against a supply wire or water in a connector.
- What you may notice
- Often no symptom, code found during a scan
- Sporadic dropouts on Bus H
- Likely causes
- Likely(+) wire touching a supply wire
- PossibleWater in a connector bridging the (+) pin to a supply pin
- RareFaulty transceiver driving the (+) line high
- 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.