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04-18-2018, 01:06 PM
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#1
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Junior Member
Join Date: Feb 2016
Posts: 29
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Speedometer recalibrate
I put oversized tires on my 2500 Hd for obvious reasons. They fit just fine but they threw off my speedometer by 2 to 3 mph. That’s not an issue but the odometer is. I calculated that the odometer was off by 40 miles on my trip to Florida. Does anyone know if it can be recalibrated?
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04-18-2018, 01:21 PM
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#2
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Site Team - Lou
Join Date: Oct 2009
Location: South Eastern PA
Posts: 23,269
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Watching this thread. I would love to know if its easy or hard to do.
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Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
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04-18-2018, 01:29 PM
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#3
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Junior Member
Join Date: Aug 2017
Location: Sacramento, CA
Posts: 9
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I have oversized tires on my 2500HD as well. Would like to know the answer too. I knew the speedometer would be thrown off before having them installed, but didn't know it might throw odo off as well.
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Yours Truly, JohnyDollar
2015 FR Shockwave T21FQMX
2015 2500HD Duramax Diesel Z71
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04-18-2018, 01:45 PM
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#4
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Just as confused as you
Join Date: Aug 2013
Location: south central Wisconsin
Posts: 5,108
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Speedometers being off by 2 to 3 mph is nothing. Many speedos are off from the factory by up to 5 mph. That's why you can get by driving 5 to 7 mph over the posted speed.
My 1500 speedo is over by 3 mph, it's been checked by sherriff's radar and gps. When I'm doing 63 on the speedo and gps, I'm actually doing 60 according to the deputy. The tires are the same as the stock from the factory.
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Richard & Jill
2014 Flagstaff 832IKBS Classic Super Lite
2018 Silverado 1500 Crew Cab Z71 4WD All Star Edition
Camping since 1989, Seasonal since 2000.
Car Shredder Op/Tech, Scrap Metal Recycling - retired
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04-18-2018, 02:04 PM
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#5
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Senior Member
Join Date: Feb 2014
Location: Port Orange Fl / Garden City Michigan
Posts: 699
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It has to be re-calibrated in the trucks computer. This can be done with the correct type reader that plugs into the the trucks ECM link/ Data link. Some OBD readers are capable of this.
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2014 SUNSEEKER 3010DS
TOADS, 2012 FOCUS OR 1998 JEEP WRANGLER,
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04-18-2018, 02:14 PM
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#6
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Speedometer recalibrate
A file has to be flashed to the ecm.
When I had my duramax tuned they also sent a file to re configure my speedo via a programmer, the speedo was 4 mph off according to gps.
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04-18-2018, 02:15 PM
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#7
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Senior Member
Join Date: Jul 2015
Posts: 7,053
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I was told by both Chevrolet and a cluster reseller that the speedometers and odometers cannot be calibrated through the computer. Maybe things have changed in the last two years, though.
Bruce
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2016 Rockwood Windjammer 3029W Diamond Edition
2015 Chevy 3500HD LTZ 6.0 Crew Cab 4x4 Long Bed 4.10:1 SRW
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04-18-2018, 02:27 PM
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#8
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Senior Member
Join Date: Apr 2015
Location: Denver, NC
Posts: 2,635
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When I had my 2006 Chevy 2500HD I used a SuperChips FlashPaq to change the tire diameter to correct Odometer and Speedo after adding 35" tires on the 6" lift.
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2015 Ram 2500 CTD,CC,SB,4x4
2016 Rockwood 2703 Emerald Edition
Husky CenterLine TS Hitch
TST 507 TPMS
Progressive Industries EMS-PT30X
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04-18-2018, 02:28 PM
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#9
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Most higher end programmers can do it .
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04-18-2018, 02:32 PM
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#10
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Senior Member
Join Date: Jun 2013
Posts: 10,833
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Quote:
Originally Posted by TURBS
A file has to be flashed to the ecm.
When I had my duramax tuned they also sent a file to re configure my speedo via a programmer, the speedo was 4 mph off according to gps.
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Did you buy a Dodge?
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04-19-2018, 12:59 PM
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#11
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Member
Join Date: May 2016
Location: St. Louis, Missouri
Posts: 68
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When I had my 2009 Silverado, I changed the rear gear ratio, and this required a speedometer recalibration. I ended up purchasing a JET Performance Programmer, which plugged into the OBD port, and was able to plug in my gear ratio, which fixed my speedometer and odometer issues, as well as turning my ABS light off.
Before I went the DIY route, I did call three different St. Louis area Chevrolet dealers, and all of them told me they would not reprogram my computer to compensate for the speedometer difference.
YMMV, but you will likely have to get some kind of a tuner for your truck. Mine was around $325.
__________________
Towed: 2017 Rockwood Mini Lite 2304
Tower: 2018 Silverado 1500 4x4 5.3L V8 3.42 rear end
2017 Camping Season: 44 Nights, 4,580 Miles
2018 Camping Season: 48 nights, 7,216 Miles
2019 Camping Season: 52 nights, 6,721 Miles
2020 Camping Season: 67 nights, 7,268 Miles
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