OBD-II code · Network
U0147 Lost Communication with Gateway "B"
Lost Communication with Gateway "B": the control module has detected this fault condition.
Is it safe to drive with U0147?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySecondary gateway unpowered
- PossibleSecondary gateway internally failed
- Less likelyGateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Usually unaffected
- Parts involved
- Gateway Module, Can Bus Wiring
Related codes
- U0146Lost Communication with Gateway "A"
- U0144Lost Communication with Personalization Module "B"
- U0145Lost Communication with Restraints Control Module Auxiliary
- U0148Lost Communication with Body Control Module "C"
- U0149Lost Communication with Door Driver Module
- U014ALost Communication With Battery Energy Control Module C
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.