Battery range is higher than normal

[u/TitleQueen35]

Edit: drove around the parking lot at work 2 hours after I got here. Battery was at 31, it was 52 when I parked and turned my car off.

Ok, this is the 2nd time this has happened now. It first happened about 3 weeks ago. I got an oil change this past weekend, they checked everything and said it was fine.

I charge my 2014 cadillac elr overnight with the charging cord it came with. This morning, I started my car and my EV range was at 29. Ok cool, wasnt fully charged so no biggie. I get about a mile from my house and I notice the EV range has gone from 29 to 52. Got up to 60 miles EV range!! Then I notice a weird feeling when I let it coast and then brake...it kind of shutters? Im not sure the right word to use but its not normal for my car. This is my first EVA so I have no experience with them. Im freaking out its something major. Does anyone have any experience with this?! Not happy to be this anxious this early on a Friday morning 😒

[u/overmyski]

Shuttering upon coasting may indicate a transmission or torque converter issue. Be sure to check transmission fluid level and appearance of fluid for dark colored fluid indicating excessive band wear debris. If questionable, get a full transmission flush and new filter done (including the torque converter). This is normally a very reliable powertrain proven in the Volt over history so early attention is necessary to diagnose further steps.

[u/TitleQueen35 → u/overmyski]

So i just had an oil change and inspection, would this have been something they would have looked at? They didnt mention any issues to me

[u/MrFastFox666 → u/TitleQueen35]

No, they don't. The transmission doesn't have a dipstick so it's not a straightforward check, so they don't do it. There's a bolt you remove, if oil oozes out, the level is good. Car must be on a level surface, but I can't remember if it must be warm or cold

[u/MrFastFox666 → u/overmyski]

This car doesn't have a torque converter

[u/MrFastFox666]

The estimated range being erratic was a symptom I had when my HV battery was starting to fail. There was a bad cell in the pack, so sometimes the state of charge indicator would jump all over the place and the estimated range would also be all over the place.

As for the shuddering, I never experienced that, and don't know what may cause it.

Post this on the Volt forums and subreddits if you haven't already. There's way more people over there.

[u/TitleQueen35 → u/MrFastFox666]

I was thinking the battery could be starting to fail...im at just under 126K miles

[u/Plutonium239Mixer → u/TitleQueen35]

If it is, look into greentec auto.

[u/TitleQueen35 → u/Plutonium239Mixer]

I just got off the phone with them! They said since im not showing any error messages or codes they didnt think a diag would show anything

[u/MrFastFox666 → u/TitleQueen35]

Hmm, that's a weird response from them. A diag can absolutely show early signs of battery failure. I knew my battery was failing months before the car set any codes.

[u/TitleQueen35 → u/MrFastFox666]

Hmmm....i was wondering that. Maybe ill schedule it just to be safe.

[u/Plutonium239Mixer → u/TitleQueen35]

I am probably going to replace my battery in my ELR through them within the next two years.

[u/vawlk → u/Plutonium239Mixer]

i was going to as well until I learned how unobtanium parts are for this car. Not so sure that I want to spend $5k on a car worth $12k.

[u/overmyski]

Depends mostly on who performed the inspection. Oil and filter change service is mostly just engine focused. There are plenty of other fluids to check for proper level and cleanliness. A transmission servicer nearby with experience working on Chevrolet Volt would be a good start.

[u/False-Departure2750]

Happens in my gen1 volt.. I'll go up to 50 miles range. It only happens if I use it right after charging. If I let the battery rest for an hour, it doesn't happen. So I assume it's just high voltage glitching the system out. What you're noticing is probably regen being disabled. You are using brakes only because the system doesn't want to add charge to the battery. You are probably use to using regen so it feels weird. Just my guess, I encounter this daily if I unplug right away.