U1101 is the Volkswagen Audi Group code for component protection active. When the airbag control module reports it, the module is not broken and the restraint circuits are not necessarily at fault. The car has not adopted the controller that is plugged into it, so the controller refuses to take up full operation and the airbag warning lamp stays on. This almost always follows a control module replacement.
Component protection ties certain control units to one vehicle identity. A protected unit that gets moved into a different car checks its own record, sees that the new car never adopted it, and limits what it will do. Ross-Tech catalogs this fault as 29797/U1101/053505 with the fault text Component Protection: Active, lists the symptoms as a warning lamp on with function limitation, and gives the remedy as learning or disabling component protection.
The important part for a shop is where the lock lives. It is held in the vehicle's protection record and cleared through Audi's online systems with factory-level access, so it is not something a generic scan tool erases and it is not stored the way an ordinary fault is stored. Clearing codes sends the light out for one key cycle at best.
U1100 frequently appears next to U1101 after the same job, and other protected modules can report the same condition at once.
Neither. U1101 is a configuration lock. The electronics inside the controller can be sound and every deployment loop can measure in range while this code is stored, because the controller is holding back on purpose. Two things follow from that. Replacing the module again with another used one reproduces the same code, and a donor module can be carrying stored crash data from its old vehicle underneath the lock, which does not surface until protection has been cleared and the unit starts reporting normally.
No. Our airbag module reset addresses stored crash data inside a module, and component protection is not stored crash data. The route that avoids the problem entirely is to keep the original controller: have its crash data cleared and put the same unit back in the same car, since a module returning to the VIN it came from is already adopted and has nothing to unlock. If the original controller is physically damaged and a replacement is the only option, plan on the online coding step at a dealer or a shop with factory access, and price that in before buying the part. Replacement units are listed under airbag control modules.
U1101 belongs to the shared Volkswagen Audi Group code set, so the number and the fault text read the same on Audi and Volkswagen vehicles built with component protection, and on the group's other brands. It is also not exclusive to the restraint system. The instrument cluster, the comfort module, and infotainment units report the same condition, so confirm which module set the code before treating it as an airbag problem. Other manufacturers assign U1101 to their own network faults, and none of that applies here.
Run a full scan and write down every module reporting component protection, not only the airbag controller. Then answer one question: is this the module the car left the factory with. Compare the part number on the unit against what the vehicle calls for, and ask the seller where it came from. If the original module is still available, send it in for a reset rather than paying to unlock a donor unit.
When the vehicle needs a controller and you cannot find the right part number, tell us what you are looking for and we will check. More on this platform is on the Audi parts and codes page.
Related codes: U1100, 00595, 65535, 00532
Keep reading:
Code scope: Audi, Volkswagen. The same number can mean something different on another manufacturer, so match the code to your make before you act on it.
A reset clears stored crash data. A replacement part fixes a hardware fault. We have read these codes since the nineties and will tell you which one you are looking at.
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