[db2022cs]

I have been having an issue with my 1LE and eLSD. Some point about 6 months ago my car started feeling like it was tramlining really hard around turns right when I started the car. Felt like a sway bar was loose or disconnected, it didn't feel good. Got car mechanically checked out, alignment, it's fine. Issue still persisted. Then I checked my eLSD display on the dash. Every time my car starts up it will lock up the eLSD in what I think are purge events to get out any air from the eLSD hydraulic system. This event according to the documentation I have read should only happen every few ignition cycles. Also according to this documentation, these events should only happen at low speeds and while going straight. I have seen these events happen over 35mph and while turning. The turning part is what has been what I have been feeling, as you can imagine, having a turn where the eLSD 100% locks up is not great feeling and I can only imagine not great for the eLSD itself.

The dealership took my $290 diagnosis fee and told me the car was fine. I had also asked them to do a service bleed procedure with a scan tool but they told me car was acting as it should.

My question is, where can I go to get someone who would give a shit about looking into my issue? With this being the eLSD, will it be hard to get this diagnosed outside of a Chevy dealership? Could I find a mechanic that may have some Chevy certified techs? What about maybe a performance shop, I could ask the shop that did my tune and headers install.

I will say, I have been having other gremlins too, sometimes the car won't unlock from the keyfob, the car sometimes won't turn off after the first time pressing the ignition, not sure if these are related at all or maybe just issue with fob battery I should probably replace soon.

Thanks for any input.

[p47dman]

Absolutely start with the simple, cheap fix. Put in new FOB battery. As far as eLSD, I would call around to dealers to see if they know about the bleeding and ask if they have a tech capable of doing so. I have a pretty good dealer by me, but they are 1200 miles from you. Keep us posted.
PS, have YOU, checked fluid level? How many miles on car? Have YOU changed diff fluid?

[bishopts]

I can't help with the eLSD problem but my car was doing the same thing where it wouldn't turn off on the first press, it sometimes wouldn't start and say no key detected, changed the battery several times in the course of a couple months. It ended up being a failing Remote Control Door Lock Receiver. It's in the rear decklid.

https://static.nhtsa.gov/odi/tsbs/20...11764-9999.pdf

There was a TSB that led me to the correction. Your vehicle isn't part of this TSB but with the symptoms it's pretty likely the problem.

With your dealership problem, you could get the service manager involved. If you can duplicate the concern pretty consistently, then see if the service manager or shop foreman will ride with you on a test drive so you can show them what you're talking about. If that doesn't work then get GM corporate involved,.

[AmericanMike]

sent you a PM

[db2022cs]

Originally Posted by p47dman

Absolutely start with the simple, cheap fix. Put in new FOB battery. As far as eLSD, I would call around to dealers to see if they know about the bleeding and ask if they have a tech capable of doing so. I have a pretty good dealer by me, but they are 1200 miles from you. Keep us posted.
PS, have YOU, checked fluid level? How many miles on car? Have YOU changed diff fluid?

I do most of my maintenance, I just passed 41,000 miles. I actually did the diff fluid change right as I passed 40k as I started having issues. Fluid looked fine, magnetic drain plug had minimal amount of sludge. Replaced with the correct fluid.

Does anyone know if there is a separate module or controller that is for the eLSD? I know you can get a track tune for the eLSD from the dealership so in theory that is something that could be looked at. I have been scouring the corvette forums too, C7 corvettes have a similar eLSD's and I have seen someone who had a similar issue, their issue was damage to a wire harness that goes through the tunnel. The only thing I can think of, is maybe my headers could have done damage to some wires, I hope not though as I made sure the harness on the passenger side was pulled away and was wrapped with heat shielding. I will have to check and see if something happened when I get back home.

Another thing I have seen on the corvette forums is a malfunctioning yaw sensor doesn't throw a code, this would explain why the eLSD will do a purge while turning. Still won't explain while this purging happens every time I start the car. Could also be a malfunctioning Chassis control module. Love modern cars but when you have issues, they can be so tough to diagnose.

[2SS Capt]

Originally Posted by db2022cs

I do most of my maintenance, I just passed 41,000 miles. I actually did the diff fluid change right as I passed 40k as I started having issues. Fluid looked fine, magnetic drain plug had minimal amount of sludge. Replaced with the correct fluid.

Does anyone know if there is a separate module or controller that is for the eLSD? I know you can get a track tune for the eLSD from the dealership so in theory that is something that could be looked at. I have been scouring the corvette forums too, C7 corvettes have a similar eLSD's and I have seen someone who had a similar issue, their issue was damage to a wire harness that goes through the tunnel. The only thing I can think of, is maybe my headers could have done damage to some wires, I hope not though as I made sure the harness on the passenger side was pulled away and was wrapped with heat shielding. I will have to check and see if something happened when I get back home.

Another thing I have seen on the corvette forums is a malfunctioning yaw sensor doesn't throw a code, this would explain why the eLSD will do a purge while turning. Still won't explain while this purging happens every time I start the car. Could also be a malfunctioning Chassis control module. Love modern cars but when you have issues, they can be so tough to diagnose.

Wait, was the first time you ever changed the eLSD fluid at 40,000 miles???

I did my 2SS non "eLSD" at 505 miles (plenty of break in sludge), 1,500 miles (not much at all) and again at 5,975 miles (looked really good, got one more change at 9,468 miles (looked great!))... Car currently has about 11,500 mile on it at 6 years old...

40,000 miles to the first Diff Oil Change on a car like this seems really, really long to me...

My motto I have banged on for 40+ years of being a car owner/self maintainer, growing up in a Auto Shop... "Fluids are cheap, components are NOT..."

[db2022cs]

Originally Posted by 2SS Capt

Wait, was the first time you ever changed the eLSD fluid at 40,000 miles???

I did my 2SS non "eLSD" at 505 miles (plenty of break in sludge), 1,500 miles (not much at all) and again at 5,975 miles (looked really good, got one more change at 9,468 miles (looked great!))... Car currently has about 11,500 mile on it at 6 years old...

40,000 miles to the first Diff Oil Change on a car like this seems really long to me...

I changed it at like 750 miles the first time, the next scheduled one is at 45,000. The maintenance schedule for rear axle fluid is every 45k miles. The fluid looked completely fine.

[2SS Capt]

Originally Posted by db2022cs

I changed it at like 750 miles the first time, the next scheduled one is at 45,000. The maintenance schedule for rear axle fluid is every 45k miles. The fluid looked completely fine.

Yeah, "Scheduled" and "good idea" are 2 different things... The manufacture wants the car to look like a "Low maintenance vehicle", but what really should be done might be something a bit different... (ALL of my cars get 3,000 mile Synthetic Oil changes, regardless of Manufacture Recommendations (some as high as 7,500 miles or more!)

"Fluids are REALLY cheap, components are NOT cheap AT ALL... Change fluids VERY OFTEN!!! VERY Cheap Insurance!!!"







This car has been completely "babied"... Over maintenanced and under driven...

Before 10,000 miles had 4 Differential fluid changes and 6 (YES, 6!!!) oil changes...

[arpad_m]

Captain, he's saying the fluid was fine when he changed it.

Also, the 1LE has two different diff fluids, one is the standard LSD fluid in the diff itself (I think this is the one you meant), but there is another for the clutch pack in the electronic diff. It's possible that this clutch pack lubricant needs attention, too.

[WiggyB]

Originally Posted by db2022cs

I have been having an issue with my 1LE and eLSD. Some point about 6 months ago my car started feeling like it was tramlining really hard around turns right when I started the car. Felt like a sway bar was loose or disconnected, it didn't feel good. Got car mechanically checked out, alignment, it's fine. Issue still persisted. Then I checked my eLSD display on the dash. Every time my car starts up it will lock up the eLSD in what I think are purge events to get out any air from the eLSD hydraulic system. This event according to the documentation I have read should only happen every few ignition cycles. Also according to this documentation, these events should only happen at low speeds and while going straight. I have seen these events happen over 35mph and while turning. The turning part is what has been what I have been feeling, as you can imagine, having a turn where the eLSD 100% locks up is not great feeling and I can only imagine not great for the eLSD itself.

The dealership took my $290 diagnosis fee and told me the car was fine. I had also asked them to do a service bleed procedure with a scan tool but they told me car was acting as it should.

My question is, where can I go to get someone who would give a shit about looking into my issue? With this being the eLSD, will it be hard to get this diagnosed outside of a Chevy dealership? Could I find a mechanic that may have some Chevy certified techs? What about maybe a performance shop, I could ask the shop that did my tune and headers install.

I will say, I have been having other gremlins too, sometimes the car won't unlock from the keyfob, the car sometimes won't turn off after the first time pressing the ignition, not sure if these are related at all or maybe just issue with fob battery I should probably replace soon.

Thanks for any input.

Mayhem is in Raleigh somewhere off New Bern Rd but I normally take my car to RPM in Garner. Pray Performance is out between Fuquay and Lillington. Like you I do most of maintenance myself but when something comes up I'm not too sure of I go to RPM. The crew at RPM is cool and friendly and only do what's needed they don't try to sell you what you don't need. Brett is cool as well over at Pray I just know the guys at RPM better and they did the first bit of work on my car.

Notice with all of that I never mentioned the stealerships around here. Only took my car there once and that was for a bricked radio other than that they don't touch it. Hope this helps and you get it resolved soon.

[db2022cs]

Originally Posted by WiggyB

Mayhem is in Raleigh somewhere off New Bern Rd but I normally take my car to RPM in Garner. Pray Performance is out between Fuquay and Lillington. Like you I do most of maintenance myself but when something comes up I'm not too sure of I go to RPM. The crew at RPM is cool and friendly and only do what's needed they don't try to sell you what you don't need. Brett is cool as well over at Pray I just know the guys at RPM better and they did the first bit of work on my car.

Notice with all of that I never mentioned the stealerships around here. Only took my car there once and that was for a bricked radio other than that they don't touch it. Hope this helps and you get it resolved soon.

I actually got my headers installed and my tune done at RPM. I am looking to get a cam maybe this year or next year from them. I wasn't actually sure if they do troubleshooting, but maybe I can reach out to them.

Yeah, I took it to the dealership as I figured this might be a tough issue to diagnose with the eLSD being a OEM specific thing but I will reach out to one of those suggestions. Thanks.

[db2022cs]

Originally Posted by arpad_m

Captain, he's saying the fluid was fine when he changed it.

Also, the 1LE has two different diff fluids, one is the standard LSD fluid in the diff itself (I think this is the one you meant), but there is another for the clutch pack in the electronic diff. It's possible that this clutch pack lubricant needs attention, too.

Hey, thank you for this information. I actually wasn't sure if there were two fluids involved in this system. That gives me more to work at when discussing issues with mechanics I go to. The car works fine after about 15 minutes of driving. Until that point, I'm uneasy until I am sure those events have cleared up.

[Joshinator99]

Originally Posted by db2022cs

Hey, thank you for this information. I actually wasn't sure if there were two fluids involved in this system. That gives me more to work at when discussing issues with mechanics I go to. The car works fine after about 15 minutes of driving. Until that point, I'm uneasy until I am sure those events have cleared up.

Yeah Saabs were running eLSD systems twenty years ago. If I had a dollar for every time I read a post about the electronic clutch portion getting underfilled I’d be rich lol. There’s a procedure that needs to be followed. The mechanical LSD side of it is easy.

[2SS Capt]

Originally Posted by arpad_m

Captain, he's saying the fluid was fine when he changed it.

Also, the 1LE has two different diff fluids, one is the standard LSD fluid in the diff itself (I think this is the one you meant), but there is another for the clutch pack in the electronic diff. It's possible that this clutch pack lubricant needs attention, too.

Ah, that's interesting, didn't know there was 2 different fluids... You're probably right, maybe one was changed and the other not...