U015F code meaning
Lost Communication With Automated Driving System Interface Module B
What U015F means
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.
U015F at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U015F
- Automated driving unavailable, redundancy fault message
- Request to take over steering and braking
- Code stored in the automation computer
Common causes of U015F
- Most likelyInterface module B fuse, supply or ground faulty
- PossibleConnector or line of the redundant bus path damaged
- Less likelyModule B not updated together with the other ADS modules
- Less likelyInterface module B internally faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ads interface module bCAN bus
What each part of U015F means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 5F | The exact fault in that area. |
What to do next
- Note U015F and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U015F
What does U015F mean?
U015F means "Lost Communication With Automated Driving System Interface Module B". U015F is the companion code for automated driving system interface module B. It is a generic code, so it means the same on every make.
Is it safe to drive with U015F?
Drive gently and only to a workshop. With U015F the car can go into limp mode (reduced power) to protect itself.
Will U015F fail an emissions test?
U015F is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U015F to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will U015F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.