Conditions for Setting the DTC

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

C1100 00

A short to ground, short to voltage or open/high resistance is detected on the 5 V reference circuit.
The electronic brake control module detects an erratic vacuum sensor signal.

C1100 01

A short to voltage or open/high resistance is detected on the vacuum sensor signal circuit.

C1100 02

A short to ground or open/high resistance is detected on the vacuum sensor signal circuit.

C1100 08, C1100 09

A invalid signal is detected on the vacuum sensor signal circuit.