Sorry, the NHTSA has not posted this TSB document yet.
You can still get the detailed info from Chevrolet for this TSB. Call your local Chevrolet dealer's service department & ask for a copy of TSB# PI1152.
HVAC Stuck in Defrost Mode, DTCs B0248, B0268 or B0408 Set
Condition/Concern
Some customers may comment that the HVAC system is stuck in the defrost mode.
When checking the vehicle for DTCs, the HVAC control module may report B0248, B0268 or B0408 set as current. Once the DTC(s) are cleared, the air delivery mode can be changed.
This condition may be due to an actuator over-traveling or intermittently binding, causing the DTC(s) to set.
