Diagnostic Aids

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

The range fault code can only be detected following a check of the air temperature actuator travel range. The air temperature actuator travel range check can only be initiated by disrupting power to the HVAC control module or with the scan tool.
The calibration limit is 147-220 counts (2.9-4.4 V). An actual range below this limit suggests an obstruction, something stuck in the door limiting travel. An actual range above this limit suggests an over travel condition, damaged or missing foam seals.
If condition not present, refer to INTERMITTENT OR POOR CONNECTIONS in Wiring Systems.

Fig 1: Diagnostic System Check Table - DTC B0441 Or B0446 (Step 1-6)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Diagnostic System Check Table - DTC B0441 Or B0446 (Step 7-13)

Courtesy of GENERAL MOTORS CORP.