U0037Vehicle Communication Bus B
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- U0037 is the umbrella code for Vehicle Communication Bus B, the second neutral network slot after Bus A; each maker decides which network sits behind it, and published uses differ widely. Volkswagen's 2014 Touareg data book sets it when a CAN frame sent on Bus B goes unacknowledged. FCA calls U0037-00 the LIN bus on the 2018-22 Jeep Wrangler, where it came with U0121 and an intermittent ABS lamp caused by a loose ground point G907A. Volvo's brake control module 2 stores U003700 alongside ECM code P25A268 and a lit check-engine lamp on 2017-24 models; software 3.0.3 cures it. On GM's 2026 full-size SUVs and Silverado/Sierra EV the brake module's U0037-88 procedure is swapped with U0028-88, and Ford reflashes the Mustang GTD dynamics module over false U0037 entries.
- What you may notice
- Warning lamps of the systems on Bus B, e.g. ABS lamp (Jeep) or check-engine lamp (Volvo)
- Stop/start or chassis functions unavailable
- Lost-communication codes stored alongside
- Likely causes
- LikelyLoose or corroded ground or supply of a module on Bus B (FCA: ground G907A)
- LikelyModule software misreporting or mishandling the bus (Volvo BCM2, Ford VDM, GM brake module 2026)
- PossibleDamaged bus wiring or a poorly seated connector
- RareA module on Bus B that has stopped answering
- Repair
- Hard · Usually a job for a workshop.Typical cost: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.