Hello, I'm new to the site but I've been having some issues with the truck. Symptoms - 2 years ago had it flashed for California smog laws, ever since I will occasionally get the grid heater light come on pulling the trailer. Been hearing a ticking sound under acceleration for a couple months now (sounds like a fuel ping) last night the light came on as I came up to a stop sign no trailer. I never lose power when the light comes on. Replaced FCA. No unusual smoke. Same fuel mileage. Opinions???? Thanks 2004.5 Ram 2500 5.9 Cummins 233k