Network, generic

U0147 Lost Communication With Serial Data Gateway Module B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0147 points to a second gateway, B. Large vehicle networks often use more than one routing node, for example a central gateway plus a separate unit that connects the car to the outside world. That is how FCA uses the code: in a field report on a 2014 Jeep Grand Cherokee, filed with NHTSA in investigation PE15-021, U0147 is listed as lost communication with the telematics gateway, next to an open circuit on cellular antenna 1 and U0184 for the radio. On such vehicles the code therefore concerns connected services such as emergency call or remote functions rather than driving. Other makers do not document U0147 publicly. A routing module of this kind filters and forwards messages between domains, as Bosch describes for its central gateways. U0146 and U0148 to U0150 cover gateways A and C to E, U0448 invalid data from B.

Likely causes

Power, fuse or ground of gateway B missing
Bus wiring or connector to gateway B faulty
Telematics unit acting as gateway B faulty or in a fault state (FCA)
Gateway B software hangs after an update or voltage dip

Symptoms

  • Connected services, emergency call or remote app functions unavailable
  • Modules behind gateway B not reachable with a scan tool
  • Further codes such as radio communication or antenna faults

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–1,000
Time0.5–3 h

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

Parts involved

gateway modulecan bus wiring

Related codes

U0146U0148U0149U0150U0448

References: static.nhtsa.gov, bosch-mobility.com, saabwisonline.com.