Network, generic

U015F Lost Communication With Automated Driving System Interface Module B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

U015F is the companion code for automated driving system interface module B. A second interface lets a fail-operational design keep a path to the vehicle actuators when the first one drops out, which matters most above SAE level 2, where the system rather than the driver watches the road. When B goes silent, the remaining path may still work, but redundancy is gone, and most systems then refuse to engage or ask the driver to take over. No manufacturer documents U015F publicly; the setting rule matches GM's generic description: a supervised periodic message is missing while supply sits between 9 and 16 V. U015E is module A, U0460 flags implausible data from B. Manual driving stays unaffected.

Likely causes

Interface module B fuse, supply or ground faulty
Connector or line of the redundant bus path damaged
Module B not updated together with the other ADS modules
Interface module B internally faulty

Symptoms

  • Automated driving unavailable, redundancy fault message
  • Request to take over steering and braking
  • Code stored in the automation computer

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,000
Time0.5–4 h

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

Parts involved

ads interface module bcan bus

Related codes

U015EU015CU015DU0460

References: law.cornell.edu, en.wikipedia.org, saabwisonline.com.