LBZ derate message/no CEL

[Dirty230]

07 classic 3500 auto with LBZ. 240k all stock, other than downpipe back Mbrp exhaust. Had no issues up until it sat for a few months low on fuel. Started it up and now has a "reduced engine power" message on the dash that won't clear. No CEL and throttle is very unresponsive which I'm sure is due to the derate. Has a brand new air/fuel filter, all fluids are good. Any ideas? Batteries have been disconnected over night and still does this with KOEO, don't even have to start it. Starts great.

Thanks

 

[onebaddmaxxx]

throttle pedal bad, fuel filter bad, or mice have gotten under the fuse block and had fun chewing wires

 

[Dirty230]

New filter, you would think with wiring or a faulty pedal that it would pop a CEL of its smart enough to derate. However unplugging the pedal doesn't set a code and will idle at 1k unless the brake pedal is pushed.

 

[JoshH]

No CEL doesn't mean no codes. Did you try to read codes?

 

[Dirty230]

I have but the code reader I have is simple and says there isn't any. I'm sure a tech2 would pull something.

 

[Dirty230]

If my foot is on the brake, I have no throttle. Let off the brake and throttle comes back.

 

[JoshH]

Have you verified the accelerator pedal position sensor is operating correctly? You're going to need a scan tool of some sort that can look at engine data to get this figured out.