Engine light On

[yamaha409]

Just bought a new fifth wheel camper installed the Super Chips Flashpaq tuner, Very happy with performance, but while pulling trailer the engine light comes on But goes off after restarting truck. I have tuner set to Tow and also using Tow Haul. What would be causing this anyone know?

[WannaDmxsub]

The light is on because a code was set.
What's the code?
What truck do you have?
What other mods have you installed?

[gr8shot]

If your tuner can't read the code, take it to a parts store, they'll have a code reader and you can find out what the code was. Then we can help you figure out whats goin on. It will also help us out if you fill in your signature so we know what year truck you have, and what engine with what mods done to it.