2007 Chev. Colorado Reduced Power Light

You need to get the computer trouble codes scanned
Check engine light on Part Ricks Free Auto Repair Advice

Jerry, Drive to a good shop. So many things can cause reduced power light unfortunately. The first step would be to get the truck hooked up to a scanner/computer and have the computer scanned for trouble codes. One thing that you could try is to drain the water from the water separator that is mounted on the frame under drivers front door. If the PCM picks up on water, power is reduced until water is removed/drained. It could be an exhaust sensor that is reading faulty. Unfortunately from here its impossible to tell you exactly what the fault is because there are just so many engine sensor inputs that could cause your problem. Check the attached links, forums,instruction and guides, Good luck
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Pt 1 2007 Chevy 2500HD Reduced Engine Power Warning Fault Code P1516... You need to take to a good repair shop that fix's this problem !

O2 sensors can cause this and often they clear up after a good run.

check for corrosion in your eng control module.it is located on the firewall on the passenger side.if it is corroded clean the connectors and module with a soft brush and coat them with dielectric grease.i have seen this problem before.

why does the reduced power light come on , then the truck stalls. If you pull over and shut down the engine and wait a 30 secounds the truck will restart and run fine until the next time you start the truck. The truck has 48k miles

sounds like you have a faulty air flow meter.

I had the same problem, and the solution was cleaning the throttle body, it does need to be completely removed to be cleaned thoroughly. I just used some brake cleaner on a rag to clean off all the carbon deposits. A friend of mine who is a dealer tech had only seen this trouble code once, and this was the solution. So far, my light has not come back on and the truck is running alot better at idle.

These trucks have a drive by wire system,we seen a` lot with a broken ground wire on the rear of the drverside cyl head,this is hard to see just feel and give the wire a tug .If the wire is loose or broken the reduced engine power light will come on.

when weather warms up a bit run engine at 3500rpm and leave it for about 10mins this should clear the cat out,if the cat runs cold it will clog up reducing the power of the engine