U1100 fault code: what it means

U1100: Component protection has no basic setting: a swapped module still needs releasing by a dealer.

Network (communication between modules) · Costly if missed

Usual causes, most likely first

1. used or swapped control module fitted
2. component protection not released

U1100 by make

Not sure what U1100 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.