Flashing Check Engine Light
Le Mans Master
Joined: Jun 2013
Posts: 7,058
Likes: 942
From: Colorado
2025 Corvette of the Year Finalist - Unmodified
2024 C8 of the Year Winner - Unmodified
2024 Corvette of the Year Finalist - Unmodified
2023 C7 of the Year Winner - Unmodified
2022 C7 of the Year Finalist - Modified
2020 C7 of the Year Finalist -- Modified
Check for a loose plug wire. 
Thread Starter
Team Owner
Joined: Sep 2000
Posts: 25,019
Likes: 2,714
From: Far NW 'burbs of Chicago
St. Jude Donor '13
^^^
I did, on the driver side. They seem tight. Passenger side requires more work but I'll just let the dealer find the code and see where that leads us.
I did, on the driver side. They seem tight. Passenger side requires more work but I'll just let the dealer find the code and see where that leads us.
Racer
Joined: Apr 2021
Posts: 361
Likes: 392
We're home now.
Since the light appeared/disappeared, we put about another 700 miles on the car at a wide range of speeds and throttle. The light has not come back, and the car continues to run perfectly.
Tomorrow I'll call the dealership and see if they want me to bring it in now, or wait until my oil change appointment next week.
Thanks for all the comments.
Since the light appeared/disappeared, we put about another 700 miles on the car at a wide range of speeds and throttle. The light has not come back, and the car continues to run perfectly.
Tomorrow I'll call the dealership and see if they want me to bring it in now, or wait until my oil change appointment next week.
Thanks for all the comments.
Safety Car
Joined: Nov 2011
Posts: 3,715
Likes: 343
From: Norman OK
No it does not and no it wont.
A flashing check engine light is a code P0300, random misfire detected. It just means the ECM has detected a misfire on a random cylinder(s). If the misfire becomes bad enough the ECM will trip the appropriate code for the corresponding cylinder (P0301 cylinder 1, P0302 cylinder 2, P0303 cylinder and so on). Misfires can happen due to bad gas or several other reasons.
Thread Starter
Team Owner
Joined: Sep 2000
Posts: 25,019
Likes: 2,714
From: Far NW 'burbs of Chicago
St. Jude Donor '13
Today the dealership read the code, P0300 - engine misfire detected.
Their Corvette tech mentioned several possibilities (not in any particular order):
A small slug of water in the fuel (refueled about 20 miles before the light came on).
An injector beginning to malfunction.
Loose plug wire.
Random malfunction for no reason.
He said the misfire must be detected for several seconds before the light will flash, but once the code has been set then a recurrence will start it flashing immediately.
We had driven about 700 miles after the initial event with the code stored in the ECM, and the light never reappeared. The engine continues to run perfectly and all gauges indicate normal. That's a good sign.
I'm scheduled for an oil change and installing the A/S tires next week. I'll put a few more miles on it, including a few 1/4 miles blasts, and let the tech do whatever investigation he decides.
Also, the Owner Manual (p. 109 for our 2017) doesn't say anything about requiring any action if the light goes away.
Stay tuned...
Their Corvette tech mentioned several possibilities (not in any particular order):
A small slug of water in the fuel (refueled about 20 miles before the light came on).
An injector beginning to malfunction.
Loose plug wire.
Random malfunction for no reason.
He said the misfire must be detected for several seconds before the light will flash, but once the code has been set then a recurrence will start it flashing immediately.
We had driven about 700 miles after the initial event with the code stored in the ECM, and the light never reappeared. The engine continues to run perfectly and all gauges indicate normal. That's a good sign.
I'm scheduled for an oil change and installing the A/S tires next week. I'll put a few more miles on it, including a few 1/4 miles blasts, and let the tech do whatever investigation he decides.
Also, the Owner Manual (p. 109 for our 2017) doesn't say anything about requiring any action if the light goes away.
Stay tuned...
Racer
Joined: Nov 2016
Posts: 497
Likes: 242
When I just purchased my car in 2016, I had the exact scenario happened once where the check engine light would flash for a few seconds. This occurred at around 200 miles on the odometer. Since it just did it once and did not reoccur, I just ignored it. Car has 19,850 miles now and it has never occurred again.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Team Owner
Joined: Sep 2000
Posts: 25,019
Likes: 2,714
From: Far NW 'burbs of Chicago
St. Jude Donor '13
^^^
The printout I saw showed the code as "cleared", but I don't know if it had cleared itself or they manually cleared it. It did show just once.
The printout I saw showed the code as "cleared", but I don't know if it had cleared itself or they manually cleared it. It did show just once.
Thread Starter
Team Owner
Joined: Sep 2000
Posts: 25,019
Likes: 2,714
From: Far NW 'burbs of Chicago
St. Jude Donor '13
When I just purchased my car in 2016, I had the exact scenario happened once where the check engine light would flash for a few seconds. This occurred at around 200 miles on the odometer. Since it just did it once and did not reoccur, I just ignored it. Car has 19,850 miles now and it has never occurred again.
Stuff like that sometimes just happens.
On our 2009, we had an occasion where all sorts of warning lights about traction control, active handling, etc; came on for no reason while driving at low speed, fully warmed up, and then went off after a couple of minutes. Couldn't find anything wrong afterwards. That happened at about 30k miles, and again at about 65k miles, and then again at about 95k miles. We traded the car at 102k miles, so didn't see it again.
I called it the 30,000 mile glitch.
Le Mans Master
Joined: Feb 2010
Posts: 7,798
Likes: 314
From: Santa Fe Tx
My 2016 Z51 did this a couple of times, but always stopped after a few minutes.
My 2007 Z06 showed codes and engine light because I changed spark plugs to hotter tip. went back to OEM spark plugs and no problem.
Cars today have a lot of stuff going on for emissions, mileage and power. Corvettes are probably on the edge of too much stuff?? All the comments above are good, best one is carry a code reader with you.
My 2007 Z06 showed codes and engine light because I changed spark plugs to hotter tip. went back to OEM spark plugs and no problem.
Cars today have a lot of stuff going on for emissions, mileage and power. Corvettes are probably on the edge of too much stuff?? All the comments above are good, best one is carry a code reader with you.
Race Director
Joined: Apr 2007
Posts: 16,025
Likes: 1,656
From: Toronto, Canada
C7 of the Year - Unmodified Finalist 2021
