Network
generic / SAE
U0147
Lost Communication with Gateway "B"
A control module has lost communication with the central gateway. The gateway routes messages between separate CAN/Ethernet segments — when it falls silent, large parts of the vehicle simultaneously go offline and many secondary DTCs are stored.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number1 / 47
Possible causes
- Secondary gateway unpowered high
- Secondary gateway internally failed medium
- Gateway module routing CAN messages incorrectly low
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
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 150–2000 €
- Estimated time: 1–6 h
- Component: gateway module
- Component: can bus wiring
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012