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Larger tires - Speedometer correction

Haufski762
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Jus Cruisin
Jus Cruisin

Then, if they did it, you'd complain about the cost which would be a 1 hour minimum charge ($125/hr now?) to create the RO, get the truck out of the lot, pull it in actually do the programming, get it

Jus Cruisin
Jus Cruisin

Yep and I'm sure it would be the case for 99%+ on here. 

newdude
newdude

Bingo lol.  More like $165-245 for that hour nowadays.  

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Jus Cruisin Enthusiast

Jus Cruisin

Posted
Posted

I used to go with lifts and significantly bigger tires. Long before all this computer/electronic stuff. I never messed with changing speedo gears. Now with all the GPS available to you just compare it to speedo readings and adjust in your head. Plus....now you're staying in warranty longer by showing fewer miles than actual. 

newdude Senior Enthusiast

newdude

Posted
Posted
11 hours ago, Haufski762 said:

Gents, 

 

Is there a way to correct the speedo for larger tires? The dealership says they can't. 

 

 

GM will only calibrate to factory authorized sizes for things like GM accessory wheel/tire packages.  

 

 

Vincej138 Enthusiast

Vincej138

Posted
Posted

Unless you went from stock to like 40's, your only gonna be off 1-3mph. Stock to 35's on the idash is 2mph diff at 70mph. And my drive safe and save app doesnt yell at me when im doing 71 in a 65. It does when im 8 over... so ya

 

Went from stock to 315/70/17's

Haufski762 Enthusiast

Haufski762

Posted
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Posted (edited)

I'll have to check the tire size but I had the speedo set at 82 and I was passing people like crazy. According to my GPS I was doing 90.

Edited by Haufski762
newdude Senior Enthusiast

newdude

Posted
Posted

Some food for thought for the 19-22 pre-refresh folks.  MC-10202392-9999.pdf (nhtsa.gov)

 

Problems are arising and growing from aftermarket speedo inline calibrators and warranty is grounds for blocking if its found and causing one or more of the listed concerns.  They also can interfere with programming done at the dealership.  

 

 

Zeker Enthusiast

Zeker

Posted
Posted
19 hours ago, Steve-2019 said:

 

This shows only for 2021 models and older.  The OP has a 2023 which is newer technology.

 

Correct. I figure if he was interested he could contact Rough Country and see if they would be releasing one for the 2022 and newer models.

Transient Senior Enthusiast

Transient

Posted
Posted
On 1/17/2024 at 4:00 PM, newdude said:

Some food for thought for the 19-22 pre-refresh folks.  MC-10202392-9999.pdf (nhtsa.gov)

 

Problems are arising and growing from aftermarket speedo inline calibrators and warranty is grounds for blocking if its found and causing one or more of the listed concerns.  They also can interfere with programming done at the dealership.  

 

 

So, stay away from dealerships.  Got it.  Glad I didn't buy the SCA Black Widow edition. 

 

Ironically, this is counter to what GM says it would be doing for dealers -- get people into the service department to generate revenue for the dealer.  You'd think they'd create ways to assist customers as an enticement to get them into the service department.  If only they offered speedometer calibration services.  I digress and I'm well off topic now, so I'll move along.

newdude Senior Enthusiast

newdude

Posted
Posted
7 hours ago, Transient said:

So, stay away from dealerships.  Got it.

 

Ironically, this is counter to what GM says it would be doing for dealers -- get people into the service department to generate revenue for the dealer.  You'd think they'd create ways to assist customers as an enticement to get them into the service department.  If only they offered speedometer calibration services.  I digress and I'm well off topic now, so I'll move along.

 

 

My point is more that these devices are causing problems either from just being installed or they cause problems during any type of ECM, BCM, TCM, etc. programming.  So even if you avoid a dealership and have some repair shop work on the issue, that device can still be the cause of whatever is going on.  

 

They do offer calibrations, but again only for factory authorized sizes.  If GM offered a 35" wheel/tire package, they'd have a calibration.

The Raven Enthusiast

The Raven

Posted
Posted (edited)
6 hours ago, newdude said:

 

 

My point is more that these devices are causing problems either from just being installed or they cause problems during any type of ECM, BCM, TCM, etc. programming.  So even if you avoid a dealership and have some repair shop work on the issue, that device can still be the cause of whatever is going on.  

 

They do offer calibrations, but again only for factory authorized sizes.  If GM offered a 35" wheel/tire package, they'd have a calibration.

 

It is almost impossible for an inline speedometer calibrator, that simply intercepts and translates the VWSS pulse, to cause any real issue.  But even if that were the case, all one has to do is remove the device, and see if the issue goes away.  If it doesn't, take it to the dealer.  No problem.

 

To add to the subject of this thread - there is not yet any way to calibrate the refresh trucks for tire size changes, or for that matter, anything at all...not even any inline translator boxes.  There is no guarantee that there ever will be either - just hope.  The Corvette and Tahoe/Yukon have been on this architecture since 2020 and 2021 respectively, and there's no progress there either.  

Edited by The Raven
Transient Senior Enthusiast

Transient

Posted
Posted
12 hours ago, newdude said:

 

 

My point is more that these devices are causing problems either from just being installed or they cause problems during any type of ECM, BCM, TCM, etc. programming.  So even if you avoid a dealership and have some repair shop work on the issue, that device can still be the cause of whatever is going on.  

 

They do offer calibrations, but again only for factory authorized sizes.  If GM offered a 35" wheel/tire package, they'd have a calibration.

I got your point, which is why I said "avoid the dealership".  It's my point I think you missed.  GM isn't serious about getting customers into the service departments at their franchise dealerships.  Something as simple as speedometer calibration could go a long way in customer service, customer  retention, and generated revenue/increased profits for their dealerships.  By your admission they have the technology and means.  They just need to stop being so narrow minded.

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