Odometer lost mileage

This does sound unlikely. The reason is, the mileage is stored in the cluster and is backed up in the PCM. This means that both the cluster and PCM would have to be rolled back. The federal government has made laws that the automakers have to put in fail safes to prevent this.

Did he put an oil change sticker in the window with a mileage for the next oil change? This means he added that mileage to what the odometer said at the time he did the oil change. If you are getting the oil changed every 3,000 miles, then that would make the sticker say 117,000+ miles. Is there a chance you looked at the sticker and just remember it being what the cluster said?

I have seen a lot of crazy things but never seen the odometer jump backwards a couple thousand miles. Anything is possible but the odometer is federally regulated to be tamper proof.

I have checked consumer reports and with the national highway traffic safety administration and there are no other reports of this happening on any Toyota product.

I just am not sure how this would happen on its own. The fact that the day you were going in for service is the day it rolled back is even more hard to explain.

Is there any history to this or has it been running fine for a while? When was the last time it was in for service?

Haha. I totally understand how you feel. I went to the grocery store with my wife the other day and she asked where the milk was at the check out and I said in the cart and it wasn't there. I was convinced someone took it out (like one of my 6 year boys) because I remembered putting it in there but they were with there mother the whole time.

I was convinced all the way back to the diary section until I found the carton of milk that I set down next to the yogurt so I could pick up 3 of them.

Clearly anything is possible but worse case scenario the mileage only backed up a couple thousand miles. Clearly we don't have proof enough to make a complaint but I would just keep an eye on it. If it does it again, I would contact the dealer to document it and then submit the info to the government website. Odometer accuracy must be maintained and if for some reason there is an issue, they need to correct it ASAP.

Thanks for using 2CarPros.

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