Actuator Recalibration
WARNING: This page is about a different car, the 2023 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
Preferred Method (with Scan Tool)
NOTE:
Do not operate any HVAC controls while the HVAC control module is calibrating as this may interrupt the process. If interrupted, improper HVAC performance will result.
- Using a scan tool, perform the HVAC Actuators Learn in the HVAC Control Module.
- Follow the scan tool directions to complete the procedure.
- Operate the system and verify that no DTCs have set as current DTCs.
- If DTC B101E 4B is set after attempting the actuator recalibration procedure, perform the following:
- Verify which actuator does not have a scan tool learn status parameter status of complete.
- Verify the unlearned actuator is physically rotating - A common cause of DTC B101E 4B is an actuator that is electrically OK but fails to physically rotate (e.g. stripped gears).
- If the unlearned actuator is not physically rotating, replace the actuator, otherwise replace the HVAC control module.
Alternate Method (without Scan Tool)
NOTE:
Do not operate any HVAC controls while the HVAC control module is calibrating as this may interrupt the process. If interrupted, improper HVAC performance will result.
- Ignition OFF/Vehicle OFF.
- Remove the HVAC control module fuse for a minimum of 10 s.
- Install the HVAC control module fuse.
- Start the vehicle.
- Wait 40 s for the HVAC control module to self-calibrate.