06 trailblazer service engine light stays on. Repairman said it needed a software update. true???
Depends on what code he found, did he check the codes? Without knowing the 4 digit code, we can't help further. I never heard a SES light pinpointing to update the software of the PCM. Go to another mechanic and get a second opinion, or better yet, get the codes scanned for free at your local auto parts store and post the code or codes back here.
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