Network, generic

U0194 Lost Communication With Digital Audio Control Module B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0194 marks the second digital audio control module, B, as silent on the bus. GM uses the code but does not name the module publicly: on the 2013-2014 Buick Enclave, Chevrolet Traverse and GMC Acadia the radio stores U0194 together with many other U-codes when the harness of the rear side object detection sensors rubs on the exhaust and disturbs the network. Ford lists U0194 among codes on 2017 C-MAX vehicles with water in the active grille shutter connector, again without stating the module. The setting rule follows GM's U0100-U02FF logic: a supervised periodic message is missing at normal voltage. U0193 is module A, U0184 the radio. Audio features may cut out; no MIL of its own.

Likely causes

Network harness chafed elsewhere in the car disturbing the bus (GM Lambda)
Water in a bus connector (Ford C-MAX)
Audio module B without power or ground
Digital audio module B faulty

Symptoms

  • Radio shuts off or audio source drops out intermittently
  • Many U-codes stored at the same time
  • Cluster or other modules act up together with the radio

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€40–600
Time0.5–3 h

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

Parts involved

digital audio control modulecan bus wiring

Related codes

U0184U0186U0193U0195

References: static.nhtsa.gov, static.nhtsa.gov, saabwisonline.com.