Odometer rolled back…
Melting Slicks
Joined: Oct 2022
Posts: 2,785
Likes: 2,329
From: Phoenix, Arizona
2025 C7 of the Year Finalist- Unmodified
2024 C7 of the Year Finalist - Unmodified
It's stored in EEPROM in the IPC, BCM and PCM. IPC and BCM are the only ones involved in displaying it on the dash. PCM copy seems to be more for archival purposes or for estimating the age of the engine or something.
If people knew how pathetically easy it is to re-write these values on a Global A car, they'd be rightly pissed at GM. You don't even have to pull the modules to do hardware EEPROM re-writes. It can be done with DID writes via the diagnostic protocols.
Oh, and **** Carfax and their poorly sourced, poorly explained, impossible to arbitrate data.
If people knew how pathetically easy it is to re-write these values on a Global A car, they'd be rightly pissed at GM. You don't even have to pull the modules to do hardware EEPROM re-writes. It can be done with DID writes via the diagnostic protocols.
Oh, and **** Carfax and their poorly sourced, poorly explained, impossible to arbitrate data.
maybe it's easy to re-write but waiting until after purchase to wave the rollback issue is poor planning/execution!!
both from dealers, i asked for carfax before looking at either vehicle, looked at both!!
'04 c5 had been owned for 18years 11 months before dealer acquisition, oil changes @ 2500 miles/fluid changes, etc back to delivery in '03!!
2014 z51 3lt had 2 owners before dealer acquisition!!
oil changes @ 3k taking up to cluster mileage!!
Melting Slicks
Joined: Jan 2019
Posts: 2,769
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From: Howell N.J
I'm old enough to remember when all you had to do was disconnect the speedometer cable, attach it to a drill, turn it on so it stays running, and let it run for a couple of days. After the odometer rolled 100,000 it would reset to 000,000. Then all you had to do was decide how many miles you wanted to show before you sold the car.
OH, I remember !!Rich
Drifting
Joined: Aug 2022
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From: Cincinnati, OH
Burning Brakes
Joined: Mar 2022
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From: Phoenix, Arizona
