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Discussion Starter · #1 ·
Hi guys was hoping I could get some input from you all. Besides maybe getting in a wreck, one of the most unfortunate things has happened.

Just a forewarning this post is way to long and probably full of many, many unnecessary details. But I’m still pretty upset with the whole situation so its cathartic just writing it all out. Thank you all.

Here is the short version: I was driving home from work tonight and the car started to surge pretty bad. Later the check engine light came on along with other warning lights.

Here’s the whole story:
On my way to work this morning, right as I pulled in, the low fuel light came on. Didn’t mean to get that low but it snuck up on me. Figured after work I’ll fuel it up. Still had 22 miles till empty according to the dash.
After work I started it up and let warm up a bit before heading to the gas station down the street to gas up.
On the way to the gas station is where issues started to become present.
It was surging pretty decent under any type of load. No matter the gear. Idled fine at a stop light though. At first I just thought that maybe it was lower on fuel than it was showing and was just starting to run out of gas.
I made it to the gas station and filled up. Only took 11.4 gallons of premium. That was puzzling since the capacity for these is 13.2 gallons. Still a little under two gallons left in the tank.
After leaving the gas station it was still surging the same and then while sitting at a light about 2 minutes from the station the check engine light came on. A few other warning lights also popped up.
At this point I realized I now actually have a problem and drove back to my work and parked it. I had my girlfriend drive to me and bring me my code reader and I got 4 codes pulled from it.

This is where I’m at now. Going to leave the car at work over night and figure out what to do in the morning. Most likely take it to the dealership since it’s still under warranty obviously, but it still just pains me that something has gone wrong already with my brand new GR. :(

I have a few theories I’m working on but was hoping maybe one of you could shed some light on the situation. Maybe it’s a common problem I’m not aware of or something…

Currently thinking it’s the fuel pump or the high pressure fuel system for the direct injection has air in it and needs to be bled/primed. Almost like a diesel when it’s ran out of fuel.

Attached is pictures of the warning lights and also what codes were thrown.

Thanks again if you read this small novel of a post. I appreciate any of your input.

Speedometer Gauge Trip computer Measuring instrument Personal luxury car

Mobile phone Telephony Telephone Portable communications device Communication Device
Mobile phone Telephone Telephony Communication Device Portable communications device
Mobile phone Telephony Telephone Communication Device Mobile device
Mobile phone Telephony Communication Device Telephone Mobile device
Mobile phone Telephony Telephone Communication Device Mobile device
 

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Its never fun to be left stranded by his new car. But it is somewhat normal to have issues at the beginning since parts tend to fail when they are defective out of the box or way later when worned out.

If the car would be out of warranty I would say to check the long&short term fuel trims and AFR to see how badly out of spec it is and maybe cycle the battery to reset the long term fuel trim. It may come back close to 0 if the issue was simply fuel starvation. But that would be surprising imo.

But in your case don't mess with it and let the dealer tow it with all the codes as is.
 

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Looks like a bad O2 sensor. This thread will be of real interest for early adopters. Now we get to see how long parts will take when there is a warranty issue. Hopefully Toyota is on their game and it’s very swift. Sorry to hear this has happened.
 

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Discussion Starter · #7 ·
Its never fun to be left stranded by his new car. But it is somewhat normal to have issues at the beginning since parts tend to fail when they are defective out of the box or way later when worned out.

If the car would be out of warranty I would say to check the long&short term fuel trims and AFR to see how badly out of spec it is and maybe cycle the battery to reset the long term fuel trim. It may come back close to 0 if the issue was simply fuel starvation. But that would be surprising imo.

But in your case don't mess with it and let the dealer tow it with all the codes as is.
I briefly looked at freeze frame data when I had the scanner hooked up to it and the long term and short term trims were both fairly close to 0. One was zero actually. I think short term. Which complicates things more considering it seems the computer isn’t trying to compensate. That leads me in the direction of fuel pump or something to do with the high pressure fuel side of the direct injection.
I didn’t look at PIDs in real time because I didn’t want to run the engine again if I could help it. So the LTFT and STFT could have changed since then. I was just looking at freeze frame date from when the codes were set.

Regardless I’m about to call the dealership near my work and see when I can have it towed in. Yay warranty.
I went to school to be a mechanic so bringing my car to a shop to have someone else work on it is somewhat foreign to me.

Thanks everyone for the support so far. I’ll do my best to keep the thread updated.
 

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2023 Toyota GR Corolla | Ice Cap + 2022 Toyota Sienna XSE | Celestial Silver
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The best option you have is to take it to the dealership.

While you may want to diagnose it yourself, and if you're like me, work on your cars, or are familiar enough with them, you want to "see" for yourself what could be the issue.

But... stop all that. It's too new and too early in the ownership to try and dive into the reasons why, take it back to the dealership, tell them your experience, and wait for them to tell you their findings.

Nothing really you can do (or should on a new GRC) other than having Toyota look at it. It definitely sucks, but I have been there before with new cars, they are all machines, with computers and mechanical parts that can all fail.

Hopefully, it is not a big problem, but I wouldn't beat myself up or spend too much time overthinking the possibilities until the Toyota dealership has had their hands on telling me what could be the problem. If they can't figure it out, seeing as how the car is new, I'm more inclined to leave it with them because the worst-case scenario is... the car is a lemon, they take it back, replace it or pay you back.
 

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Discussion Starter · #12 · (Edited)
stock ECU that hasn’t been flashed? Have you messed with anything on it yet?
Literally have done nothing to it other than drive it to work since I’ve gotten it. No modifications to anything whatsoever yet.

Edit: Okay I swapped out some license plate lights… Lol. Sure hope that wasn’t it! :LOL:
 
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Literally have done nothing to it other than drive it to work since I’ve gotten it. No modifications to anything whatsoever yet.

Edit: Okay I swapped out some license plate lights… Lol. Sure hope that wasn’t it! :LOL:
PROVEN Do not switch your license plate lights to LED. It will void your warranty and shit your engine!!!!!!!!
Disclaimer: This is a 100% factual statement.
 

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Discussion Starter · #14 ·
PROVEN Do not switch your license plate lights to LED. It will void your warranty and shit your engine!!!!!!!!
Disclaimer: This is a 100% factual statement.
Yeah…. now that you mention it I think I did see that disclaimer in the 1000s of pages I had to sign when I bought the car. How could I have been so careless???? :ROFLMAO::ROFLMAO::ROFLMAO:
 

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Discussion Starter · #15 ·
Small update for everyone following this thread.

Dropped off the car this morning at the dealership. Luckily avoided the tow because I was only 10 minutes from a good dealership and it was still running mostly normal except when accelerating from a dead stop so I was able to nurse it over. Not ideal but didn’t want to wait the time for a tow truck and deal with that whole other can of worms.

They had it in the shop most of the day. Finally before they close I talk to my service advisor and basically where they are at now is they don’t know exactly what’s wrong. He told me something is definitely wrong (no shit :rolleyes:) but they don’t know exactly what it is. Probably a module not 100% certain.
The problem they are having is that the car is so new and unique that they have to call Toyota and be advised on what to do and what to test.
So obviously because of that they will need it over night into tomorrow. I’ll keep you all posted.

At least I got a sweet ass 21’ Camry Hybrid for a loaner . :ROFLMAO::ROFLMAO:
 

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Small update for everyone following this thread.

Dropped off the car this morning at the dealership. Luckily avoided the tow because I was only 10 minutes from a good dealership and it was still running mostly normal except when accelerating from a dead stop so I was able to nurse it over. Not ideal but didn’t want to wait the time for a tow truck and deal with that whole other can of worms.

They had it in the shop most of the day. Finally before they close I talk to my service advisor and basically where they are at now is they don’t know exactly what’s wrong. He told me something is definitely wrong (no shit :rolleyes:) but they don’t know exactly what it is. Probably a module not 100% certain.
The problem they are having is that the car is so new and unique that they have to call Toyota and be advised on what to do and what to test.
So obviously because of that they will need it over night into tomorrow. I’ll keep you all posted.

At least I got a sweet ass 21’ Camry Hybrid for a loaner . :ROFLMAO::ROFLMAO:
Lmao they only gave me an xse Camry when they had my Supra haha you’re ballin
 

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Following as well. Sorry to hear that you’re going through this. I’m sure Toyota will figure it out and fix it for you. Just be prepared for some wait time if any parts are needed. There’s no telling what parts, if any, that have been stocked up for this car because it’s so new.
 
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