fault codes 05 ism

156 is fuel timing...if its running it will go away. I got mine by pulling the ECM fuse to prevent unauthorized movement and they tried to crank it. Dunno 084......

Yellow warn light is an idiot light. Either coolant was low, oil pressure dropped, oil pump bad or connector is loose at sensor which is located on the left front of the engine. Make sure the plug is pushed all the way on and the harness is supported.

Radiator caps are bad on these trucks, the 6.0 diesel Ford and several others. It's the cap that twists and clicks like a gas cap. If it's old, replace it....under $10

Also check that cluster of wires to a connector off the battery. If they're corroded the ECM won't get proper voltage and you'll get all this BS and more.

Good luck