U0070Vehicle Communication Bus E (-) Low
- Generic OBD-II code · Network
- How the car detects it
- U0070 points to a (-) line of Vehicle Communication Bus E with a path to ground, CAN-Low wherever Bus E is a high-speed CAN. Traffic survives the short, which onsemi and NXP both confirm, so drivers rarely notice anything; onsemi traced a higher node current, because the upper driver stage now pushes current through the 60-ohm termination into ground. On a fault-tolerant low-speed bus the effect is a mode change instead: NXP's TJA1055 reads a never-ending dominant state, needs 0.3-1.6 ms to confirm it, then disables the CAN-Low output stage and keeps going single-wire via CAN-High, with weaker immunity to interference in that mode. Either way the code often lingers in memory unnoticed. No manufacturer documents U0070 publicly. An ohmmeter between CAN-Low and chassis that reads close to zero confirms it.
- What you may notice
- Usually no symptom, code found during a scan
- Occasional interference with audio or display functions on Bus E
- Likely causes
- Likely(-) wire of Bus E chafed against body ground
- PossibleHarness pinched during installation of trim or accessories
- RareFaulty transceiver pulling CAN-Low to ground
- 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.