[2023_ZL1-AUTO]

WOW, something is MAJORLY WRONG! I went to data log my 2023 ZL1 about a half hour ago. This was after repairing several exhaust leaks that I think were causing my O2 sensors and AFR sensor to have slightly false readings. The other day, I had the car idling with zero problems a few different times to double check where the exhaust leaks were. I shut it off and then yesterday fixed the exhaust leaks but didn't start it all yesterday.

Then today just now, I go out to start the car and it was so weird from the first push of the button. I pushed the start button, and it turned over kind of quick and the just stopped. Kind of as if I let off the button too soon (but I don't think I did). Then tried again and it started, but it was weird immediately. The car was in touring mode, but the exhaust values were randomly open and then close again all on their own, it did this several times. So, I shut it off, restarted it and again it was really weird. The dash light up then went blank a few times and then stayed on. I shut if off again. Tried to started it but nothing, then I literally open the drivers door to get out of the car and it it started, kind of as if it was a delayed start from trying before opening my door. I shut if off again and restarted it. The dash was on immediately but the gauges jumped around weird, randomly (but all gauges were in sync), and then came to settle at no readings and the attached screen: [Rear Alex System Off], then a few seconds later [ECU], [Service] light on the entire time.

[EDIT] Forgot to mention that I did try and drive it around the block and it acted like it was in limp mode and quickly I saw something on the dash that said "teenage" driver" But didn't catch the whole thing.

I saw this threat (https://www.camaro6.com/forums/showthread.php?t=597023 ) Not sure how mine would go to the same issues as the other thread as it's not been driven, like at all. Any ideas?

[arpad_m]

I would take it in to a dealership and let them figure it out under warranty. Hopefully there is one around you that is trustworthy and capable.

Somewhat related, prior to buying my 2018, back in NJ, part of my research was "probing" service departments of local dealerships, seeing the quality of their work and their attitude on small jobs, with boring mundane cars (used my wife's SUV for the most part). I then did the same when we moved to Tennessee. In both cases I found local gems that I feel perfectly fine asking for help with my forever Camaro. I think this sort of "sleuthing" is worth at least considering, unless you are capable and equipped to fix most or all potential issues (I am clearly not).

[Scottyz]

I would disconnect the battery and let it sit a while. Myself I would leave it an hour unhooked. Everything these days have so many modules and crap that I often see computer systems glitch out and give weird codes or operate weird. No starts. Trouble codes for all sorts of crap totally unrelated to each other.
First thing I do…..disconnect the battery or shut the battery switch off if it has one. I leave it for a bit and way more often than not the problems disappear. I fix heavy equipment for a living but also help with the fleet of trucks, vans and SUVs.
I would start with that.

[LT4Greg]

Get it to the dealership and let them check it out since it’s still under warranty unless you have done major mods to your car.

[2023_ZL1-AUTO]

Originally Posted by LT4Greg

Get it to the dealership and let them check it out since it’s still under warranty unless you have done major mods to your car.

Major mods... YES... 480miles on the Odometer... Ugh....

[2023_ZL1-AUTO]

So a quick update: I did unhook the battery for about 10 minutes. Nothing different so it's unhooked now and will stay that wait until tomorrow evening. I decided to unplug all gauges that connect to the ODB2 port and presto. When I unhooked the AEM AFR wideband gauge, most all the issues went away. But, the car will not allow manual shifting (dos this have something to do with the message I saw about teenage driver?). When I try to use manual shift, it just continues to read "D" on the dash. Could there be something glitched with the AEM wideband gauge causing all these issues. That seems so weird. But to test, I connected it back and sure as anything all the issues came back. I disconnected it and the messages went away.

[LeonardS]

Originally Posted by 2023_ZL1-AUTO

Major mods... YES... 480miles on the Odometer... Ugh....

480 miles and it has exhaust leaks on a stock exhaust system?

[2023_ZL1-AUTO]

Originally Posted by LeonardS

480 miles and it has exhaust leaks on a stock exhaust system?

"Major mods... YES... "

https://www.camaro6.com/forums/showthread.php?t=611982

Also, fob #2 worked normal, meaning the car allowed manual shift with the 2nd key fob. so i think i must have jammed the car into valet and or teen driving mode with fob #1 somehow. I will keep battery unplugged over night and call AEM about what could be wrong with the AWE AFR gauge sensor.

[Vigilante375]

A lot of issues when people start to mod is electrical. Your issue is going to not be with the gauge but hope it was wired.

People run into the same problem by simply changing our the back up lights to something brighter but don't install a resistor or try to splice into another wire for power.

[2023_ZL1-AUTO]

Originally Posted by Vigilante375

A lot of issues when people start to mod is electrical. Your issue is going to not be with the gauge but hope it was wired.

People run into the same problem by simply changing our the back up lights to something brighter but don't install a resistor or try to splice into another wire for power.

I hear yeah on that for sure.... what's weird, is mine has been fine for 200+ miles, with the current mods as they are. Then all the sudden, today, all this happens, only when the AEM AFR is connected to the OBD2 port. It's been install and working fine for over 200 miles with no issues. It's just weird it seemed to start acting weird all the sudden. In fact, the gauge itself is still install and still has power. I've only disconnected it from the OBD2 port. By doing so, all issues seen to have went away. I cleared all DTC codes, check engine light went out. I've made 4 trips data logging since and still no check engine light and all is good. I have not reconnected the AEM AFR to the OBD2 port. I will get a new one (again) and install and see how it acts. It's all just weird!!!

[DangerZL1]

Originally Posted by 2023_ZL1-AUTO

It's all just weird!!!

That's At least you're on the right track.

[2023_ZL1-AUTO]

So this is what I was freaking out about... This is when the AEM AWE AFR is connected to the OBD2 port, but I disconnected it, reset the DTC codes and now no check engine and no codes:

2023-03-26 14:03:26

2023 Chevrolet
VIN: xxxxxxxxxxxxxxxxx

Readiness Monitors

Confirmed Emissions Fault Codes: 3
MIL is On: Yes

Misfire Complete
Fuel System Incomplete
Components Complete
Catalyst Complete
Heated Catalyst Not Supported
Evaporative System Incomplete
Secondary Air System Not Supported
Gasoline Particulate Filter Not Supported
Oxygen Sensor Incomplete
Oxygen Sensor Heater Incomplete
EGR and/or VVT System Incomplete


Warmups Since Code Clear: 0
Distance Since Code Clear: 0 Km / 0 Miles

30 Fault Codes Detected

0x541 Body Control Module
B0005-01 Pending, History
Collapsible Steering Column Deployment Control

U0100 Pending, History
Lost Communication With ECM/PCM A

U0121 Pending, History
Lost Communication With Anti-Lock Brake System (ABS) Control Module

0x542 Power Steering
U0100 History
Lost Communication With ECM/PCM A

U0121 History
Lost Communication With Anti-Lock Brake System (ABS) Control Module

0x543 Electronic Brake Control Module
U0073 Pending, History
Control Module Communication Bus A Off

U0100 Pending, History
Lost Communication With ECM/PCM A

U012A Pending, History
Lost Communication with Chassis Control Module A

U042B-71 Pending, History
Invalid Data Received from Chassis Control Module A: Actuator Stuck

0x54B Lane Departure Warning
B1A01 History

0x54E
U0100 Pending, History
Lost Communication With ECM/PCM A

U0121 Pending, History
Lost Communication With Anti-Lock Brake System (ABS) Control Module

0x553 Audio Amplifier
U0100 Pending, History
Lost Communication With ECM/PCM A

0x554 Electronic Parking Brake
U0100 History
Lost Communication With ECM/PCM A

0x7E8 Engine Control Module
P0137 Permanent
O2 Circuit Low Voltage (Bank 1, Sensor 2)

P0575 Pending, History
Cruise Control Input Circuit

P0700 Pending, Current, Old, History
Transmission Control System (MIL Request)

P0703 Pending, History
Brake Switch B Circuit

P150C Permanent
Transmission Control Module(TCM) Engine Speed Request Circuit

P2270 Permanent
O2 Sensor Signal Stuck Lean Bank 1 Sensor 2

P2544 Permanent
Torque Management Request Input Signal A

P2548 Permanent
Torque Management Request Input Signal B

U0073 SES, Pending, Current, Permanent, History
Control Module Communication Bus A Off

U0101 SES, Pending, Current, Permanent, History
Lost Communication with TCM

U0121 Pending, History
Lost Communication With Anti-Lock Brake System (ABS) Control Module

U0140 Pending, History
Lost Communication With Body Control Module

0x7EA Transmission Control Module
U0073 SES, Pending, Current, Permanent, History
Control Module Communication Bus A Off

U0100 SES, Pending, Current, Old, Permanent, History
Lost Communication With ECM/PCM A

U0140 Pending, Old, History
Lost Communication With Body Control Module

0x7EB CCM / FSCM
U0100 Pending, Old, History
Lost Communication With ECM/PCM A



Codes Queried from 13 Controllers

[2023_ZL1-AUTO]

Quick update: I picked up a new AEM AFR UEGO kit tonight from Jegs and put my ZL1 on the QuickJacks. I decided to replace every thing, including the wiring harnesses etc. But thank goodness I went under the car first. I immediately notices that two wires on the AFR O2 sensor pig tail were nicked and they looked to be shorting out against each other. I replace the sensor and reconnected to the wires already ran and presto! All seems good and the AFR gauge is "acting" normal. Meaning, when I have the car in accessory mode the gauge cycles from 8 to 20 and then comes to rest like @ 15.75 (car is not on), I'm letting exhaust cool down to tight blots. Tomorrow I hope everything is will work out so I can get a good data log and have Andrew at CSP continue the tuning process!

[Scottyz]

There ya go. Nice find. Hope all goes well from here on.