Reduce engine power &service stability control comes up intermittenly

the "Reduced Engine Power", problem causes the PCM to disable "Service Stability Control" and "Traction Control" turning on the warning lights to come on for those systems . The reduced engine power is because of a problem with the electronic throttle control system or as GM calls it TAC system . Reduced Engine Power Mode
When the PCM detects a condition with the TAC system, the PCM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
• Acceleration limiting--The PCM will continue to use the accelerator pedal for throttle control, however, the vehicle acceleration is limited.
• Limited throttle mode--The PCM will continue to use the accelerator pedal for throttle control, however, the maximum throttle opening is limited.
• Throttle default mode--The PCM will turn OFF the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The PCM will perform the following actions:
- Limit engine speed to idle by positioning the TP, or by controlling the fuel and spark if the throttle is turned OFF.
- Ignore the accelerator pedal input.
• Engine shutdown mode--The PCM will disable fuel and de-energize the throttle actuator.
© 2017 General Motors Corporation. All rights reserved.



Drive by Wire training Your best bet , take it to a GM dealer

You may have to have the harness replaced. Be sure the connector innards stay dry.When they get wet the contacts will oxidize and start shorting to each other and also the oxide is an insulator causing connections to open. Good Luck, I had a water problem with a Ford Flex and even though covered under warranty since I was the second owner they would not honor it. It cost me about three grand so price things out before getting it fixed, the car may not be worth the investment.

There are a lot of things that can cause this. Get the check engine light test done for free at a local auto parts chain.

It's all tied together in the computer system . When you start to loose control the computer takes over reducing engine power , applying brakes etc... to bring vehicle back into control . The throttle body on your vehicle is computer controlled . electronic throttle control . the gas pedal has sensors , the throttle body has sensors an a electric motor . The lights came on because the computer disabled these systems .

fully charge battery and make sure everything switched off i.e rear window demist etc and take it for a run to get it up to tempature then park up rev engine at fast idle approx 2750 rpm for 180 seconds then take foot off throttle and allow to idle for 30 seconds this will clear your catalyst and get it up to the 600 degrees needed for it to operate properly this should remove the engine warning light

Make sure your 12V grounds to engine and chassis are good.

Pretty much tells you the system with the fault

Traction Control is embedded into the abs braking
system, so diagnose that using the codes you have,
same as any other obd codes you get

The Reduced Power could be another problem & it
cuts off fuel injectors to save the exhaust converter
from overheating & being ruined

Hello
When the service engine soon light (Also called the check engine light) is turned on this is to alert you to the fact that Powertrain Control Module (computer) has detected a failure somewhere in the systems it controls, this can be the transmission or the engine or emission system, there are fault codes set in the modules memory for these faults. What needs to happen now is to have the powertrain control module scanned with a special tool called an OBD2 electronic engine control scanner or a OBD2 code reader. Once the code(s) are read then you must perform the diagnostics for each code and make the appropriate repairs based on the findings of the diagnosis that was performed, this is called doing "Pinpoint" testing.

Take it to a repair shop & then use the
computer to study OBD2 Systems & get
a cheap code reader

Look at a fuse,they do not fix anything
& hardy ever blow.

When you say check light has been on for awhile
Are you not aware of why the dash light come on?
They have been on all vehicles for 31 years now

Any dash light is a System Malfunction,& you need to
check for codes within a couple of days or stop using
the car,each & every time,unless you understand the
current OBD2 Systems & have at least a code reader

yeah when the reduced power engine light comes on that will happen. that will happen for a couple of reasons. use a code scanner and it will tell you what exactly is wrong with the car and you can clear the code when your done.