15 Tahoe won't go past 85MPH

[Unclehank47]

As of yesterday my 15 Tahoe LTZ will not go faster than 85mph. Feels like a governor is on it. Also when the left turn signal is on the interior light flashes. Weird weird weird! Recently had the front struts replaced from magride tp passive. Does anyone have a clue on this?

 

[DWTahoe]

Interior lights is a different known issue. Search for interior "disco lights" and you will find the part numbers and a pretty good details on how to fix it. It's a bad module in the over head console lights that affects all rows. If I find the thread, I'll add it.

As for the 85mph...my 15 doesn't have that issue. Good luck.

 

[singhnyc]

do you have suspension light on from the mag ride delete

 

[Unclehank47]

Suspension warning comes on at start up but I clear it.

 

[sealandsky]

Could it be that the driver controls were reset inadvertently to "teen driver" or "valet" mode?

 

[Oh Kee Pah]

I would suggest contacting a company called Xineering in Florida.
They sell a GM Shock Delete kit (I have this installed on my '15 Tahoe LTZ).
One of the email correspondences I had with the company mentioned an "84 mph speed limiter" may occur if the MRC delete circuits were not operating properly. I also remember them saying it was perfectly safe to drive, but the limiter may occur. I didn't have that happen so I never went further with that.

I'm sure a quick call to them will get you the answers you need!

 

[sealandsky]

As of yesterday my 15 Tahoe LTZ will not go faster than 85mph. Feels like a governor is on it. Also when the left turn signal is on the interior light flashes. Weird weird weird! Recently had the front struts replaced from magride tp passive. Does anyone have a clue on this?

I guess the elephant in the room is, why would you delete the MRC and revert to traditional shocks?

 

[Adam10532]

As of yesterday my 15 Tahoe LTZ will not go faster than 85mph. Feels like a governor is on it. Also when the left turn signal is on the interior light flashes. Weird weird weird! Recently had the front struts replaced from magride tp passive. Does anyone have a clue on this?

As of yesterday my 15 Tahoe LTZ will not go faster than 85mph. Feels like a governor is on it. Also when the left turn signal is on the interior light flashes. Weird weird weird! Recently had the front struts replaced from magride tp passive. Does anyone have a clue on this?

Yes it's definitely with your Magnetic Ride. Reach out to xineering in Florida someone else suggested it in a earlier post suggested it. They will send you USB cord that you can hook up to your OBD Inlet and you can correct this code and with your laptop and the application you can clear this code once and for all. I know each time you start your truck it says "service suspension". And as a safety feature you can't go over 85. I have done this from experience I reach out to xineering in Florida they sent me a cable that I was able to hook up to my yukon problem solved for me

 

[Unclehank47]

Yes it's definitely with your Magnetic Ride. Reach out to xineering in Florida someone else suggested it in a earlier post suggested it. They will send you USB cord that you can hook up to your OBD Inlet and you can correct this code and with your laptop and the application you can clear this code once and for all. I know each time you start your truck it says "service suspension". And as a safety feature you can't go over 85. I have done this from experience I reach out to xineering in Florida they sent me a cable that I was able to hook up to my yukon problem solved for me

Awesome reaching out asap!

 

[Oh Kee Pah]

I guess the elephant in the room is, why would you delete the MRC and revert to traditional shocks?

The MRC is going to FAIL - period.

Also, many owners complain of a harsh ride with the MRC.

My Tahoe's MRC front shocks went bad at 32k miles! Just under $2,000 at Chevy to get the OE replacement done. Crazy! I spent less $ on my MRC delete circuits and Fox shocks (awesome upgrade to front and back suspension). My Fox 2.0 front coilovers are also fully serviceable by the company and can be adjusted for increased ride height; or moved to another Tahoe/Suburban/Silverado if desired - all bonuses in my book.

 

[sealandsky]

The MRC is going to FAIL - period.

Also, many owners complain of a harsh ride with the MRC.

My Tahoe's MRC front shocks went bad at 32k miles! Just under $2,000 at Chevy to get the OE replacement done. Crazy! I spent less $ on my MRC delete circuits and Fox shocks (awesome upgrade to front and back suspension). My Fox 2.0 front coilovers are also fully serviceable by the company and can be adjusted for increased ride height; or moved to another Tahoe/Suburban/Silverado if desired - all bonuses in my book.

I dunno, I've driven plenty of rental / loaner Tahoe's, Yukons and Suburban's without MRC and found them bouncy and well... Riding like a truck. Both of the Yukon's I've had with MRC have been like driving on a cloud - My 2019 being the better of the 2 (even on 22's). Maybe it will break some day, but I'll keep the MRC or drive something else.

 

[mikeyss]

Every part on a vehicle can or will eventually fail, it's the nature of machines. Sorry, I just had to say it

 

[singhnyc]

Suspension warning comes on at start up but I clear it.

that is the cause for truck noting going over 85 get it checked

 

[chuckieBootstrap]

I have a 15 Denali and just got my shocks switched because the front shocks went out. Noticed that I couldn't go over 85 and took it right back to the shop that replaced them. Clearly I need the delete kit. But my question is should the shop be responsible for this or am I ? I definitely feel like they should have advised of this prior to fixing.

 

[gat0r]

is this shop a GM dealer?

in a dream world it would be the shop
in reality, more than likely you... (as the shop did the job you asked...replace the shocks)

however since the shop clearly isn't familiar w/ the work required... sweet talk them & see if they will cover some or all of it

 

[Doubeleive]

I have a 15 Denali and just got my shocks switched because the front shocks went out. Noticed that I couldn't go over 85 and took it right back to the shop that replaced them. Clearly I need the delete kit. But my question is should the shop be responsible for this or am I ? I definitely feel like they should have advised of this prior to fixing.

pretty sure you asked to have the shocks replaced, should have done your homework.
for future reference you can buy the "shock" portion of the oem strut for less than 1/2 the cost of what the dealer wants and have them replaced and out the door for 1/2 of what the dealer would charge and walk away with a lifetime warranty. rockauto.com

 

[swathdiver]

As of yesterday my 15 Tahoe LTZ will not go faster than 85mph. Feels like a governor is on it. Also when the left turn signal is on the interior light flashes. Weird weird weird! Recently had the front struts replaced from magride tp passive. Does anyone have a clue on this?

Battery may not have enough juice to run the truck at that speed or beyond. Put a scan tool on it and I bet it's time for a new battery. Voltage gets low and all kinds of things start acting screwy.