any way to fix stabiltrack without replacing the entire thing? 2nd time problem

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started in winter - heavy ice and snow. engine will slow down due to error message and states needs maintenice. some days problem will fix itself and engine light goes off. when it ice or uneven road conditions, error msg comes back on and engine power lowered. Frustrated. told at GM dealer would have to replace entire stabilitrack which is approx $500+. first time problem happened, repaired under warranty approx 3-4 year ago. bought veh new in 2009.