{"nhtsa_id":11015963,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-03-26","date":"2025-03-26","document_id":"9100525","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM","mfr_system":"Headlamp, hardware ignition line","summary":"\"Base led headlamp RT 25 MY HDCC Ignition DTC (U300A-29 Ignition Switch - Signal Invalid) in stored state for SLML and SLMR. All headlamps on the Heavy Duty with SW 24.43.00(Premium) or 24.44.00(Base) will show a U300A-29 -> Ignition Switch-Signal Invalid as a stored DTC. If you experience this condition, please clear the DTCs on SLML and SLMR once and restart the truck and check if the DTC is in active state 10 seconds after the engine is turned ON, check the hardware ignition line and repair as required. If the DTC reappears as stored DTC (See Figure 1), no repair is required. The headlamps are good. The DTCs will appear every time the Ignition is cycled, and should be ignored.\"","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11015963-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11015963-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11015963","components":[{"id":"electrical","name":"Electrical system","parent":null}],"codes":["U300A"],"topics":[],"vehicles":[{"make":"RAM","model":"2500","year_from":2025,"year_to":2025,"match":"exact","vehicle_ids":["2025_ram_2500"]},{"make":"RAM","model":"3500","year_from":2025,"year_to":2025,"match":"exact","vehicle_ids":["2025_ram_3500"]},{"make":"RAM","model":"4500","year_from":2025,"year_to":2025,"match":"exact","vehicle_ids":["2025_ram_4500"]},{"make":"RAM","model":"5500","year_from":2025,"year_to":2025,"match":"exact","vehicle_ids":["2025_ram_5500"]}],"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":[]}