Action Taken When the DTC Sets

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The ECM/PCM stores the DTC information into memory when the diagnostic runs and fails.
The malfunction indicator lamp (MIL) will not illuminate.
The ECM/PCM disables the A/C compressor clutch.
The ECM/PCM records the operating conditions at the time the diagnostic fails. The ECM/PCM stores this information in the Failure Records.
The ECM/PCM will report a value of 0 kPa to the HVAC control module.
The driver information center will display SERVICE A/C SYSTEM.
The A/C OFF segment will illuminate on the HVAC control module.