Stabilitrak service comes on and i lose power. could this be the body modularsensor or throttle body sensor.

This is usually caused by a bad or disconnected wheel speed sensor.

Engine power reduced... is the main problem ,this turned off Traction control off, service stabilitrak. Your vehicle has electronic throttle control , The Gas pedal has sensors inside which are connected by electrical circuits to the PCM - engine computer ,the PCM use's these inputs to control the throttle plate by use of a 12 volt DC motor . Plus there are position sensors on the throttle body for feed back to the PCM. When one of these signals is off The PCM will put the system into reduced power mode . This will also set DTC'S - diagnostic trouble codes . Your best bet , take it to a qualified repair shop.

The reduced engine power light is most likely setting the stabilitrack light to come on. The reduced engine power light is normally set when the computer senses an issue with the throttle actuator assembly. This actuator assembly needs a corolation signal from the gas pedal sensor to operate properly. In my opinion and experience in the automotive repair industry, the throttle actuator assembly is more prone to failure than the gas pedal sensor.

Several things could cause this. The computer may need to be updated, bad throttle body or bad thottle position sensor.

both the systems use the same sensor and rotor on the wheels so the problem points to loose wires/broken wires or dirt between the sensor and the rotor . You will have to check all wheels to find the fault . By your statement that it occurs on turning I would be paying serious attention to the front wheels as this is where dirt. sticks and other stuff can break or disconnect the wires.

Is there underhood heat shield material removed? Condensation can form under the hood can drip onto electrical connectors.
Check each connectors for corrosion.

This is a common problem with GM's. The TPS sensor goes bad in the throttle body. Throws out a message to service Stabilitrac. Not SO!!!
The kicker is that the whole throttle body has to be replaced because the TPS sensor is actually part of the throttle body!!! Costs around $250.00 for aftermarket.

These are not codes , they are warning lights , telling you the driver that a problem exist . code says, traction control off,next code says ,service stabilitrak and the last code says...engine power reduced. DTC'S - diagnostic trouble codes could be stored in the control modules that control these system's . The main problem is more then likely with the reduced engine power. This is because of a problem with the electronic throttle control system . This problem will turn off these other thing's , turning on their light's .
Throttle Actuator Control (TAC) System Description
All newer vehicles have this ! There are position sensors in the Gas pedal and on the throttle body on the engine , The computer uses a DC volt electric motor to make the vehicle go . The sensors wear over time , the motor can wear , wiring can break etc...
Reduced Engine Power Mode
When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
• Acceleration limiting--The ECM will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.
• Limited throttle mode--The ECM will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
• Throttle default mode--The ECM will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The ECM will perform the following actions:
- Limit engine speed to idle by positioning the throttle position, or by controlling the fuel and spark if the throttle is turned off.
- Ignore the accelerator pedal input.
• Engine shutdown mode--The ECM will disable fuel and de-energize the throttle actuator.
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I work at a chevy dealer an can not believe the one you took it to can't find the problem . Where is this dealer ? I will have a long talk with my district rep.
Drive by Wire Function and diagnostics by Wells

i have chevy equinox 2007 LT with AWD system, my problem is that i have two messages appearing in the DIC : satbilitrack and service tracktion control. can u help me with this and tell me whats the problem and how should i fix it?

I have a 1999 intrepid hat stalls out when i am driving mostly when driving slow would that be a crank position sensor?If not what could it be