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Originally Posted by denalixl
I have a 2004 Denali XL [with tire monitor sensor]got the same problem ENGINE REDUCE POWER AND T/C DISABLE at the same time, engine no power. When I take to the dealer first time that has happen, they only found the problem of service tire monitor sensor. Since I was replace the original tire and has the after marker wheels on/ with out sensor that could be the case. And another time that happen was after I used remote starter to start the truck, it will cause the ENGINE REDUCE POWER AND SERVICE ENGINE LIGHT ON " it not happen all the time but usually it does. I assume that might be the case of truck act up the problem. Or could be something else.
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You are not going to like what I am about to tell you..If you have a remote start on your vehicle, most likely the dealer is not going to touch your truck for the "Reduced Power" problem..your vehicle has been modified and therefore GM will not authorize any assistance.
it breaks down like this...many circuits on your vehicle use a low voltage communication data line (5v to be exact)..any modification to these cicuits can cause an excessive resistance causing a voltage drop across the circuit..the voltage drop effects the communication of the modules and can cause some very strange problems...been there, done that,got the t shirt.
now there are some on here that will want to discredit what I am saying about remote starts and aftermarket alarms (mostly because they sell or install them), but I am telling you from first hand experiance these things are headaches for dealers (matter of fact our dealer refuses to have them installed for customers) and for techs like me that have to diagnose wierd electrical problems.
my suggestion is take the thing off, put the truck back to factory specs and see what happens....we have enough problems with factory wiring..we don't need anything else added in.