Conditions for Setting the DTC

WARNING: This page is about a different car, the 2017 Cadillac ATS. 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 signal circuit.
An open/high resistance is detected on the 5 V reference circuit.
An open/high resistance is detected on the low reference circuit.
The electronic brake control module detects an erratic vacuum sensor signal.

C1100 01

A short to voltage is detected on the vacuum sensor 5 V reference circuit.

C1100 02

A short to ground is detected on the vacuum sensor 5 V reference circuit.

C1100 09

The vacuum sensor signal too fast transitions.

C1100 5A

The vacuum sensor signal is not plausible.