Outside Air Temperature Display is Inaccurate on DIC and/or Auto (C68) HVAC System Intermittently Too Hot or Cold (Reprogram HVAC Control Module)

Some customers may comment that the outside air temperature display is inaccurate on the DIC and/or the Auto (C68) HVAC system is intermittently too hot or too cold. This condition occurs after the vehicle has been restarted and the outside temperature is significantly different than it was the last time the vehicle was operated.

The heating, ventilation and air conditioning (HVAC) outside air temperature (OAT) does not update correctly across the ignition cycles causing the software to record and keep the last outside temperature setting. The last OAT setting is then used to determine the air blend door position, which affects the cabin temperature comfort level on the automatic HVAC systems.

Important: Select the correct operating system or calibration file using the vehicles RPO Code (C67 or C68).

A revised calibration has been developed to address this condition. Technicians are to reprogram the HVAC Control Module using the Service Programming System (SPS) with the latest software available on TIS2WEB. Refer to the HVAC Control Module Programming and Setup procedures in SI. As always make sure your Tech 2® is updated with the latest software version.

For vehicles repaired under warranty, use: