U0006High Speed CAN Communication Bus (-) Open
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- U0006 points to an interrupted CAN-Low conductor, i.e. the (-) line on the high-speed network. That line rests near 2.5 V and sinks by about a volt whenever a dominant bit is sent. Nodes isolated by the break no longer receive a usable differential signal from the rest of the network, while the modules still joined on both wires can go on exchanging data. A line interruption is outside what common high-speed transceivers can diagnose themselves (NXP), so the code relies on module-specific checks such as missing acknowledgements. No manufacturer documents U0006 publicly. Frequent findings are a conductor fractured at a door or tailgate hinge, a backed-out terminal or a corroded splice. With the battery disconnected, a check across the two lines often shows about twice the normal 60 ohms when the break separates one of the terminators.
- What you may notice
- Part of the modules unreachable, others still respond
- Warnings from the affected systems, sometimes only when moving doors or harness
- Likely causes
- LikelyCAN-Low conductor fractured at a hinge or flex point
- PossibleCorroded splice or connector in the CAN-Low path
- PossibleCAN-Low terminal backed out after work on the harness
- 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.