TPMS Wierdness

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Dec 28, 2017 | 07:58 PM

#21

TEXHAWK0

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From: Longview Texas

Quote:

Originally Posted by fiftyohm

Dealer fixed the issue. The ticket says, (complete with misspellings, etc), 8020010 ELECTRONIC SUSPENSION CONTROL MODULE REPLACEMENT 1857 W
6939 MODULE DID NOT RECOGNIZE TPMS CONFIGURATION 8020010
PARCEL TIME RESET TPMS SETTINGS

So, I'm guessing here that the Mag Ride upgrade they did caused the problem, assuming that the MRCM is the same as the ESCM. We'll likely see more of this as more mag ride upgrades are done.

Glad I don't have all that fancy new fangled stuff on my base Stingray, including eLSD.

Dec 29, 2017 | 10:36 AM

#22

fiftyohm

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From: Houston Texas

Quote:

Originally Posted by TEXHAWK0

Glad I don't have all that fancy new fangled stuff on my base Stingray, including eLSD.

yeah, I hear ya. Well, except for the fuel injection. And ignition. And steering. And brakes. And climate control. And security system. And transmission. And...

😉

Dec 29, 2017 | 10:48 AM

#23

Foosh

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Quote:

Originally Posted by fiftyohm

Could be. Like most software upgrades from laptops to cars, things need to be done in a precise order with systems configured a certain way for the software installation to work properly, and not create other problems. It wouldn't be shocking to learn that a tech didn't perform the MSRC re-flash precisely according to GM guidance.

The other thing I wonder about is that all cars have TPMS, but not all cars have MSRC and presumably no ESCM. Perhaps the TPMS module communicates through the ESCM on MSRC cars.

Last edited by Foosh; Dec 29, 2017 at 10:49 AM.

Dec 29, 2017 | 11:12 AM

#24

ram_g

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Joined: Nov 2017

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Hmmm...so now that they replaced your suspension control module, did you lose your mag shocks upgrade?

(Not stirring the pot here, this is a genuine question since we'd all benefit from greater understanding of how these things work...)

Dec 29, 2017 | 12:11 PM

#25

fiftyohm

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From: Houston Texas

Quote:

Originally Posted by ram_g

A very good question. I thought about that at the time, and I don't think they actually *replaced* the MRC. There was no P/N for it and no materials listed on the invoice. Also, the characteristics of the upgrade seemed to still be present. I will be very, very aware of the possibility nevertheless, as it was after all, 350 bucks!

Dec 29, 2017 | 02:42 PM

#26

Rebel Yell

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From: Down south in Dixie

Quote:

Originally Posted by fiftyohm

I suspect it's not the upgrade brother, as I don't have the Mag Ride. Mine ('16 base) started the same thing Monday, but it was showing the right front tire. All were at 30 psi also. I though it may have been happening because as it was as cold as a Narcs heart that day. But if it continues on I'll know what to tell the dealer. Thanks for your post. It will be awhile before I can get mine to the dealer so please let us know if it's stays fixed. Thanks.

Jim

Last edited by Rebel Yell; Dec 29, 2017 at 02:43 PM.

Dec 29, 2017 | 03:08 PM

#27

fiftyohm

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From: Houston Texas

Quote:

Originally Posted by Rebel Yell

WILCO, Jim. After taking those shots, I saw the all the tires periodically affected - even jumping around as I watched. Often I'd get indications of under inflation at 34 psi on hot tires. Thing is, it shouldn't throw a warning at 30 psi hot or cold. I think there's a threshold at 26 psi, or something like that. In addition, the car knows the tire temperature, and the software ought to know 30 when cold is perfect. Bottom line is that it's a very strange architecture that throws warnings when the sensor inputs are nominal. Hell, reading the pressures and temps is the hard part. Deciding whether or not to throw a warning is a simple lookup table. You'd think a fault at that level would cause the entire system to crash.

Dec 29, 2017 | 06:03 PM

#28

Rebel Yell

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From: Down south in Dixie

Quote:

Originally Posted by fiftyohm

WILCO, Jim. After taking those shots, I saw the all the tires periodically affected - even jumping around as I watched. Often I'd get indications of under inflation at 34 psi on hot tires. Thing is, it shouldn't throw a warning at 30 psi hot or cold. I think there's a threshold at 26 psi, or something like that. In addition, the car knows the tire temperature, and the software ought to know 30 when cold is perfect. Bottom line is that it's a very strange architecture that throws warnings when the sensor inputs are nominal. Hell, reading the pressures and temps is the hard part. Deciding whether or not to throw a warning is a simple lookup table. You'd think a fault at that level would cause the entire system to crash.

Thank you sir. I'm an old school guy, and just to hardheaded to even try to understand all the new technology in the new cars.