rough country speedometer calibrator

5031 Views 24 Replies 12 Participants Last post by tex2018, 7 mo ago

soonerdb1

Discussion Starter · Sep 13, 2020

3

Has anyone else run into this with the RC inline speedometer calibrator? I have a 2018 Z71 and the module says it's for 2017/2018 GM trucks. The harness I removed is in the exact location as the instructions, but it's a 12-pin harness and the harness I received from RC is 16-pin.

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soonerdb1

Discussion Starter · #2 · Sep 13, 2020

Disregard. I was looking at the wrong connector.

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KER17Z71

· #3 · Sep 13, 2020

Glad to hear you got it sorted out!
I have the hypertech version, same thing just rebranding - on my 2019 canyon 265 70 17 tires. If you don't mind let me know if you can set cruise control at 73 mph, from 72 mine will skip and go to 74. Was the same on my 2017 colorado also. Thanks,

Reactions: 1

Squeak93

· #4 · Sep 14, 2020

KER17Z71 said:
Glad to hear you got it sorted out!
I have the hypertech version, same thing just rebranding - on my 2019 canyon 265 70 17 tires. If you don't mind let me know if you can set cruise control at 73 mph, from 72 mine will skip and go to 74. Was the same on my 2017 colorado also. Thanks,

That’s exactly what my rc one does.

soonerdb1

Discussion Starter · #5 · Sep 14, 2020

KER17Z71 said:
Glad to hear you got it sorted out!
I have the hypertech version, same thing just rebranding - on my 2019 canyon 265 70 17 tires. If you don't mind let me know if you can set cruise control at 73 mph, from 72 mine will skip and go to 74. Was the same on my 2017 colorado also. Thanks,

Can do. Should be commuting this week on I-80 and will test it out.

Reactions: 1

overpakd

· #6 · Sep 15, 2020

KER17Z71 said:
Glad to hear you got it sorted out!
I have the hypertech version, same thing just rebranding - on my 2019 canyon 265 70 17 tires. If you don't mind let me know if you can set cruise control at 73 mph, from 72 mine will skip and go to 74. Was the same on my 2017 colorado also. Thanks,

Mine skips from 68 to 70 (as well as a few other skip points). I never really thought about it enough to realize it's probably related to the calibrator.

Sent from my SM-G973U using Tapatalk

soonerdb1

Discussion Starter · #7 · Sep 15, 2020

overpakd said:
Mine skips from 68 to 70 (as well as a few other skip points). I never really thought about it enough to realize it's probably related to the calibrator.

Sent from my SM-G973U using Tapatalk

Mine skipped 73 as well

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soonerdb1

Discussion Starter · #8 · Sep 15, 2020

overpakd said:
Mine skips from 68 to 70 (as well as a few other skip points). I never really thought about it enough to realize it's probably related to the calibrator.

Sent from my SM-G973U using Tapatalk

soonerdb1

Discussion Starter · #9 · Sep 15, 2020

I called RC and they said that hasn’t been reported but is prob a software glitch. Reporting it to their QA department and said to call back in a month.

KER17Z71

· #10 · Sep 15, 2020 (Edited)

soonerdb1 said:
I called RC and they said that hasn’t been reported but is prob a software glitch. Reporting it to their QA department and said to call back in a month.

Oh it's been reported more than once! A guy named Gary Woodward at hypertech was who I talked to both times. I also had problems with interior dome leds interfering with it on the 2017 Colorado, removed them fixed problems. haven't tried leds in the 2019 canyon yet, the leds caused the unit to click on and off and other weird stuff especially when using cruise.

soonerdb1

Discussion Starter · #11 · Sep 16, 2020

KER17Z71 said:
Oh it's been reported more than once! A guy named Gary Woodward at hypertech was who I talked to both times. I also had problems with interior dome leds interfering with it on the 2017 Colorado, removed them fixed problems. haven't tried leds in the 2019 canyon yet, the leds caused the unit to click on and off and other weird stuff especially when using cruise.

So, yours is Hypertech and doing the same thing? Mine is Rough Country, so definitely a software glitch since they use the same download source.

I have a quirk with my LED dome lights as well. I have the dome exit lights switched off most of the time as the "fix," but when on I have to wait about 30 seconds after I get out to lock with my remote.

Speedy4x4

· #12 · Sep 16, 2020

Skilping mph, probably not as much of a glitch, that would be coding for cruise control, that is set at every mph, and the speesomkter calibration, changes the correct speedometer for larger tires, but not the coding for the cruise.
Have a good GPS that can read tenths?
Maybe 62.9 mph then 74 mph.
Every click on cruise adjust 1.1 mph with larger tires instead of 1 mph on factory size?

Just a thought

Reactions: 1

Snipesy

· #13 · Sep 16, 2020

KER17Z71 said:
Glad to hear you got it sorted out!
I have the hypertech version, same thing just rebranding - on my 2019 canyon 265 70 17 tires. If you don't mind let me know if you can set cruise control at 73 mph, from 72 mine will skip and go to 74. Was the same on my 2017 colorado also. Thanks,

Probably a weird rounding error.

Cruise control is in kilometers per hour.... Specifically whole number kilometers.

1 mile is 1.6km. But 1.6 is impossible to input and has to be rounded.

In actuality the BCM seems to follow some weird pattern. Likely to ensure the dash indicator correctly rounds to the correct mph. Even in kmh this weird pattern is present. And it’s not as simple as just adding 1.6kmh and rounding to nearest full number.

But messing with the signal to the dash will likewise mess with how the rounding works. And is probably what is causing the jump. The actual speed difference is probably small, like 1.24 mph.

Reactions: 2

Snipesy

· #14 · Sep 16, 2020

Here’s some simple math to determine why and where the errors pop up.

Blue values are what the BCM likes.When you push the button it goes to the next or previous blue value. I’m not guruanteeing they are the real values but it’s something like this.

As you can see some DIC readings are skipped when you use adjustment.

1drv.ms

ChevyCruiseValues.xlsx

Microsoft Excel Workbook

1drv.ms

93Duc

· #15 · Sep 24, 2020

Also have the RC speedometer calibrator, am able to set cruse @ 73 mph.
FWIW, I initially set it up using 265/70 17 - but changed it and input 31.65 as the tire size.

Speedometer Vehicle Car Auto part Gauge

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Jaspah

· #16 · Sep 24, 2020

KER17Z71 said:
caused the unit to click on and off and other weird stuff especially when using cruise.

Oh, good. I thought I was going insane. I get this same exact thing sometimes, and I couldn't figure out what's causing it. I wonder if it is a bad ground somewhere? I've modded in a few things, hardwired dashcam, 5v LED strips (!), and a subwoofer. I'm calibrated for 265/70/R17.

TylerFisher

· #17 · May 17, 2021

KER17Z71 said:
Glad to hear you got it sorted out!
I have the hypertech version, same thing just rebranding - on my 2019 canyon 265 70 17 tires. If you don't mind let me know if you can set cruise control at 73 mph, from 72 mine will skip and go to 74. Was the same on my 2017 colorado also. Thanks,

So I got the RC version but I have a 2019 Colorado. Where did you find the right plug.

TylerFisher

· #18 · May 17, 2021

I bought a RC in-line speedometer calibrator. I have a 2019 Colorado V6 and can’t find the plug for it. Anyone have any ideas?

KER17Z71

· #19 · May 17, 2021

Automotive tire Rectangle Office equipment Font Wood

TylerFisher said:
So I got the RC version but I have a 2019 Colorado. Where did you find the right plug.

Under drivers side dash,

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Madpickinskills

· #20 · 7 mo ago

KER17Z71 said:
View attachment 410137
Under drivers side dash,

Does the panel need to be removed?

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