Code Definition

B1249 — Blend Door Failure

System: Body  |  Type: Manufacturer-Specific  |  Make: Generic

About B1249

B1249 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1249 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The blend door is the HVAC flap that regulates how much air flowing through the evaporator is routed across the heater core, blending heated and cooled air to achieve the commanded discharge temperature. The blend door is driven by a small electric actuator, typically a DC motor with an internal feedback potentiometer that reports door position back to the climate control module. DTC B1249 sets when the module commands the actuator to a target position and the feedback signal does not reach that position within the expected time, or the feedback signal falls outside its calibrated range. Sympt...

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