{"nhtsa_id":11034093,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-06-26","date":"2026-06-26","document_id":"26-004","mfr_campaign":"26-004","replaces":null,"component":"ELECTRICAL SYSTEM","mfr_system":null,"summary":"This bulletin describes the procedure to install a Grand Design RV – supplied diode into the water pump control circuit of the Firefly Emprise electrical system on affected ProMaster LVP units. The diode prevents excessive current in the water pump control circuit that can damage the Firefly circuit board.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11034093-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11034093-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11034093","components":[{"id":"electrical","name":"Electrical system","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"GRAND DESIGN","model":"LINEAGE","year_from":2027,"year_to":2027,"match":null,"vehicle_ids":[]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}