Jeep Grand Cherokee 2026 — technical service bulletin
Bulletin 08-279-26 · NHTSA communication 11035165 · issued Jul 15, 2026
Technical service bulletin
communication type
Electrical System
component
2026
model years
3
vehicle entries
Official summary
Flash: Heating, Ventilation And Cooling (HVAC) Module Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set the following Diagnostic Trouble Code (DTC): ● B1148-2A - Left Rear Heated Seat Switch - Stuck. Customers may also comment on one or more of the following: ● Rear heated/vented seats stop working. ● The rear heated/vented seat button is not illuminating. This bulletin involves reprogramming the HVAC module with the latest software.
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.