When the check‑engine light flashes and your diagnostic tool reads P0340 code, you’re not alone. This error appears frequently on light‑duty diesel trucks — such as Ford F‑series, Dodge Ram Cummins, or Toyota Hilux — but the same underlying issue also exists in off‑road machinery like excavators and loaders using similar electronic fuel management systems. The P0340 code identifies a fault in the camshaft position sensor circuit — a small component whose failure can cause sudden stalls, misfires, or even no‑start conditions. In this guide, we’ll explain what that sensor really does, why you might still see the code after replacing it, and how to perform a proper camshaft position sensor replacement to restore reliable power and timing to your heavy equipment.