On I am going to start with this Evey one but two guys gave you good help! OK with high voltage the thing is that it could be really bad bc the transistors etc.are working over time you need to do voltage drop test ya it not dropping but it is the same way to track it down with pulling out your hair lol I bet that you have a 5 volt signal wire wrong to one that gets 12v when you are running the car their is a few more
In limp mode . check all yor work again
SOURCE: why does reduce engine power light comes on chevy
That is a hard problem to pin point without knowing what codes the computer has stored. It can be any number or sensors or engine problems.
You can go to most auto parts stores and they will pull the codes for you for free.
You have a leak. Check the oil to see if there is water in it. Withe the engine running, check the tailpipe to see if excess water is coming out. If yes to either of these, then you have a bad head gasket or cracks in the head/block. You need to find where the coolant is leaking in order to fix it.
SOURCE: engine power reduced appeared on the DIC of 2008 chevy cobalt
Whenever this warning light or any
other stays on in the dash it is indicating that the systems control
module (or the system sensor in the case of lights like low oil
pressure, door open indicators etc.) has detected a fault, it then
disables the system (this applies to ABS,TCS, TCM, SRS, TPMS, MIL,
CEL and BCM faults and others) as long as the light is on. You must
now have the dealer hook up a special electronic diagnostic tool and
"scan" the system for the fault code that is stored for the
problem(s) Legend of Abbreviations. ABS
Anti-lock brake system. TCS Traction control system, TCM Transmission
control module, SRS Supplemental restraint system, BCM Body control
module. TPMS Tire Pressure Monitor System, MIL Malfunction Indicator
Lamp, CEL Check Engine Light.
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