Mercedes-Benz GL450 gas idle EGR issue causing engine shutdown at traffic on Mercedes-Benz GL450

Some Mercedes-Benz GL450 owners report experiencing engine shutdown while idling in traffic, often attributed to gas idle EGR issues. These shutdowns can be exacerbated by engine overheating, which may occur due to low coolant levels or an inefficient cooling fan. Additionally, a faulty ignition system, including worn-out spark plugs or ignition coils, can lead to unexpected stalling. Owners also note that rough idling, which may indicate an engine misfire related to the EGR issue, can cause vibrations when the vehicle is stationary. It is recommended for affected owners to have their vehicles inspected by a qualified mechanic to diagnose and address the specific EGR-related problems to ensure reliable engine performance.