U0148Lost Communication With Gateway C
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- U0148 reports that the third gateway, Gateway C, has gone silent. A gateway links separate bus segments (CAN, LIN, Ethernet) and forwards messages between them, so when it drops out, every module behind it disappears too. GM's procedure for U0100-U02FF explains the mechanism: listeners expect a periodic state-of-health message and log the missing sender once it fails to arrive at 9-16 V. No manufacturer documents U0148 publicly; GM's U-code list contains only U0146 for its serial data gateway. Unlike U0146 and U0147 for gateways A and B, or U0149 and U0150 for D and E, this code names the C unit, whose role differs by maker. Often several other U-codes appear at once; MIL usually off.
- What you may notice
- Several modules behind the gateway unreachable at once
- Many U-codes stored across the vehicle
- Multiple warning lamps or messages in the cluster
- Likely causes
- LikelyFuse, power or ground of gateway C missing
- PossibleDamaged bus wiring or corroded connector at gateway C
- PossibleGateway C software fault or incomplete programming
- RareGateway C internally faulty
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.