Network, generic

U0148 Lost Communication With Gateway C

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Fuse, power or ground of gateway C missing
Damaged bus wiring or corroded connector at gateway C
Gateway C software fault or incomplete programming
Gateway C internally faulty

Symptoms

  • Several modules behind the gateway unreachable at once
  • Many U-codes stored across the vehicle
  • Multiple warning lamps or messages in the cluster

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–1,200
Time1–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

gateway modulecan bus wiring

Related codes

U0146U0147U0149U0150

References: saabwisonline.com, bosch-mobility.com, saabwisonline.com.