U007DControl Module Communication Bus K Off
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- U007D is one of the few late-alphabet bus-off codes with a public trace, all from GM's 2017 full-size trucks and SUVs (Silverado, Sierra, Tahoe, Suburban, Yukon, Escalade). There a serial data gateway module connects many CAN segments, and PIT5586 lists U007D next to U0073, U0078 and a long row of lost-communication codes. GM names two causes: bent, backed-out or loose terminals at gateway connectors X1 and X2, and a microcontroller fault that keeps the gateway powered but silent on every channel. For the latter GM's interim remedy is to pull the gateway's power fuse for a minute (F26DL on trucks, F28DL on SUVs) until a software update is installed, without replacing parts. Complaints range from dead gauges to no crank or start-then-stall.
- What you may notice
- Instrument cluster gauges dead or fluctuating
- No crank, no start or stall after starting
- Radio, climate controls or steering wheel buttons inoperative
- Numerous lost-communication codes in many modules
- Likely causes
- LikelyBent, backed-out or loose terminals at the gateway connectors
- PossibleGateway microcontroller locks up and stops communicating
- RareDamaged wiring on Bus K
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.