My buddy ghas a 2003 trailblazer and it's giving a service 4wd light and the dealer wants 150.00 to flash the pcm so the light goes off. Will the service 4wd light go of if I do a tune just basic lite stuff like speed limiter and reduce torque management then re flash the pcm? He rather pay the credits for later mods than give 150.00 to the stealership.