🚛 What Happens If You Ignore ECM Fault Codes 111 or 343? On Cummins M11, L10, and N14 ECMs, codes 111 and 343 mean an internal failure. Your truck might run for a while, but it will eventually shut down and not start again. 😱 If you see these codes, get your ECM checked immediately to avoid breakdowns. ✅ 👉 Have you ever had fault code 111 or 343 on your truck? Share it in the comments. #Trucks #TruckMaintenance #TruckTips | Oscar Truck ECM