What are the symptoms of an bad glow plug module in an 6.0?

Symptoms of a bad glow plug module in a 6.0 diesel engine may include hard starting, especially in cold weather, increased exhaust smoke, and rough engine operation. You might also notice a lack of power during acceleration and a potential check engine light indicating glow plug or related issues. Additionally, the glow plug module may fail to properly heat the glow plugs, leading to prolonged cranking times. If these symptoms occur, it’s advisable to have the module and glow plugs inspected.