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Are you checking all 3 credit bureaus? An old auto loan of mine was only reported to two. There's no requirement for an auto lender to report at all, but most lenders generally do. 4-5 months does seem like a long time.
Oh, I understand what you're saying - your auto loan appears on your credit reports, but TMCC has not reported any activity for 4-5 months. I thought you were saying that the loan didn't appear at all on your credit report(s).
There's no requirement for creditors to report on a specific schedule, or to report at all for that matter. Having said that, I have a TMCC auto loan that was opened in August, and activity has been reported every month since then.