U0007High Speed CAN Communication Bus (-) Low
- Generic OBD-II code · Network
- How the car detects it
- U0007 reports that the (-) line CAN-Low on the fast bus is held below its valid band, normally by a short to ground. The physical layer copes with this particular case: onsemi recorded ongoing transmission with a distorted level pattern and raised transceiver current, and NXP counts it among the hidden failures. Traffic therefore continues, yet the reserve against interference shrinks, which may surface as an occasional lost frame or a brief warning. Only modules whose transceiver offers bus diagnosis can spot the condition directly. No manufacturer documents U0007 publicly; FCA field cases describe ground shorts on the CAN C (+) and (-) lines under U0001. Inspect sections near sheet-metal edges, brackets and seat rails, then measure CAN-Low to ground with the battery disconnected.
- What you may notice
- Usually no noticeable malfunction, code found during a scan
- Occasional short-lived warnings, worse with moisture
- Likely causes
- LikelyCAN-Low insulation worn through against body metal
- PossibleWater in a connector bridging CAN-Low to a ground pin
- RareModule transceiver internally shorted on its CAN-Low pin
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.