REDUCED ENGINE POWER 2004 CHEV on 2004 Chevrolet Avalanche 1500

THE TRUCK WILL JUST IDLE HOW DO YOU FIX IT

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1 answer 1 comment
What DTCs are present?
i TOOK IT TO HAVE IT READ TODAY, LET YOU KNOW TOMORROW BUT I AM LOST. THE TRUCK SET FOR ABOUT ONE MONTH AND THE BATTERY WAS COMPLETE DEAD. I PUT SOME CHARGE IN THE BATTERY AND STARTED IT. NOW IT JUST SAYS REDUCED ENGINE POWER. ANY ID BEFORE I GET THE TRUCK BACK TO CHECK, WILL IDLE NOW