Service traction control and P0300 code
Thread Starter
Intermediate
Joined: Dec 2012
Posts: 39
Likes: 3
From: Tennessee
Service traction control and P0300 code - RESOLVED
This morning I had these issues start on my Vette - The car ran fine for a 50+ mile trip at speeds between 60-70. Backed into a parking spot and shut off engine then noticed I was too far over and restarted car. At that point she started chugging and misfiring - Still running, but very rough - Check Engine light began to flash and "Service Traction Control" appeared in DIC along with the Traction light (The vette rearend sliding?)
Turned off engine and restarted, no better. Came out 4 hours later and drove car to AutoZone to check code - P0300 - Random Misfire. They are saying plugs or ignition.
Drove the car back home and now beginning to search for cause/solution.
Any Ideas?
2008 Coupe A6
Any help would be greatly appreciated.
Turned off engine and restarted, no better. Came out 4 hours later and drove car to AutoZone to check code - P0300 - Random Misfire. They are saying plugs or ignition.
Drove the car back home and now beginning to search for cause/solution.
Any Ideas?
2008 Coupe A6
Any help would be greatly appreciated.
Last edited by bushjc; Feb 11, 2015 at 04:28 PM. Reason: Resolved
Racer
Joined: Oct 2013
Posts: 258
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From: Gurnee IL
Check it you might be surprised.
S -
Last edited by Lerxst; Aug 19, 2014 at 05:48 PM.
Melting Slicks
Joined: Feb 2008
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From: Palm Beach County, Florida
Le Mans Master
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From: Currently somewhere in IL,IN,KY,TN,MO,AR,MS,AL, or FL
"Service Traction Control" and traction control being disabled because of a loose plug wire? 
Multiple unrelated issues sure sounds to me like low voltage causing computer confusion. Bad battery or bad alternator would be my first guess.
Multiple unrelated issues sure sounds to me like low voltage causing computer confusion. Bad battery or bad alternator would be my first guess.
Le Mans Master
Joined: Dec 2012
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From: Between North and South Pole
St. Jude Donor '13-'14-'15-'16-'17-'18-'19-'20-'21-'22-'23
Due to inherent crap quality control this is the EXACT reason I experienced the same thing. LOOSE SPARK PLUG WIRES. Unfortunately common.
Le Mans Master
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From: Between North and South Pole
St. Jude Donor '13-'14-'15-'16-'17-'18-'19-'20-'21-'22-'23
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Le Mans Master
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From: Between North and South Pole
St. Jude Donor '13-'14-'15-'16-'17-'18-'19-'20-'21-'22-'23
Make sure you also check the coils and that none of the wires are burned from possible arcing. Examine the plugs before ordering new.
Last edited by IrishSpuds; Aug 20, 2014 at 08:37 AM.
Melting Slicks
Joined: Feb 2008
Posts: 3,248
Likes: 4
From: Palm Beach County, Florida
Mmmm. Sorry it was not the loose wire quick fix.
You don't say how many miles on your car, but a bad wire or coil could be an issue as well. Best to throw a code reader on it.
I have to say, mine spat out about 6 different codes on loose plug wire.
Damn confusing, even with the shop manual.
Good luck and post up your findings!
You don't say how many miles on your car, but a bad wire or coil could be an issue as well. Best to throw a code reader on it.
I have to say, mine spat out about 6 different codes on loose plug wire.
Damn confusing, even with the shop manual.
Good luck and post up your findings!
Thread Starter
Intermediate
Joined: Dec 2012
Posts: 39
Likes: 3
From: Tennessee
Sorry for the oversight - 105k miles (yes, I know too many for a vette) - I am hoping that plugs may be the fix - She had 70k on it when I bought it and I have not changed them. Code reader at AutoZone returned P0300 - Random Misfire
Last edited by bushjc; Aug 20, 2014 at 09:05 AM.
Le Mans Master
Joined: Feb 2007
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From: Currently somewhere in IL,IN,KY,TN,MO,AR,MS,AL, or FL
You need some more code reading. Service traction control is going to set codes and P0300 is not one of them.
Team Owner
Joined: Aug 2006
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C6 of Year Finalist (appearance mods) 2019
Time to replace plugs anyway. I changed my wires at the same time.
Service traction control warning pops up randomly on these cars.
I would have the battery load tested and test the alt. Our cars are very sensitive to low voltage.
Service traction control warning pops up randomly on these cars.
I would have the battery load tested and test the alt. Our cars are very sensitive to low voltage.
Thread Starter
Intermediate
Joined: Dec 2012
Posts: 39
Likes: 3
From: Tennessee
More Information . . .
I took the car to shop yesterday and had it put on their test computer -
Seems the misfire is coming from cylinder 1. The tech first moved the plug wire, issue did not move. Next the plug itself, issue did not move. Next the ignition coil - started car and it seems to completely solve the issue.
Turned off the car and restarted - misfire started again, same cylinder.
Then he connected a fuel test guage and tested. With the engine off, a steady stream of gas emerged. Started car and the stream became a powerful gusher.
I am taking the car back today to remove the Fuel injector to test/clean it.
Comments appreciated.
Seems the misfire is coming from cylinder 1. The tech first moved the plug wire, issue did not move. Next the plug itself, issue did not move. Next the ignition coil - started car and it seems to completely solve the issue.
Turned off the car and restarted - misfire started again, same cylinder.
Then he connected a fuel test guage and tested. With the engine off, a steady stream of gas emerged. Started car and the stream became a powerful gusher.
I am taking the car back today to remove the Fuel injector to test/clean it.
Comments appreciated.
Thread Starter
Intermediate
Joined: Dec 2012
Posts: 39
Likes: 3
From: Tennessee
Additional Testing . . .
Took the car back to the shop today.
The tech perform a test that he explained to me as a Fuel Injector cleaning test. He drew about a quart of gas from the fuel rail and mixed it with some type of cleaner. Then he removed the fuse from the fuel pump and he ran the car using the "mix" back through the fuel rail.
After running all the mix back through, he replaced the fuse and restarted the car. No effect.
He then hooked the car back up to the Diagnostics Computer and ran a pressure test on the injectors. He wanted me to post the reading and see if any of you might feel (as he does) that the fuel injector is bad.
Injectors 2 - 8 had a pressure reading of 15 psi and the number 1 injector was reading 20 psi.
Again, any assistance is appreciated!
The tech perform a test that he explained to me as a Fuel Injector cleaning test. He drew about a quart of gas from the fuel rail and mixed it with some type of cleaner. Then he removed the fuse from the fuel pump and he ran the car using the "mix" back through the fuel rail.
After running all the mix back through, he replaced the fuse and restarted the car. No effect.
He then hooked the car back up to the Diagnostics Computer and ran a pressure test on the injectors. He wanted me to post the reading and see if any of you might feel (as he does) that the fuel injector is bad.
Injectors 2 - 8 had a pressure reading of 15 psi and the number 1 injector was reading 20 psi.
Again, any assistance is appreciated!
Thread Starter
Intermediate
Joined: Dec 2012
Posts: 39
Likes: 3
From: Tennessee
Fuel Injector ??
With all of the different testing that has been done, does this sound like a fuel injector issue? Is it normal for only one to go bad, or should I be getting ready to replace them all? I have only user top tier fuel, if that matters.
Or could it be something much more severe?
Or could it be something much more severe?
Racer
Joined: Nov 2012
Posts: 474
Likes: 1
From: Raleigh North Carolina
isn't Catalytic converters a possibility
With all of the different testing that has been done, does this sound like a fuel injector issue? Is it normal for only one to go bad, or should I be getting ready to replace them all? I have only user top tier fuel, if that matters.
Or could it be something much more severe?
Or could it be something much more severe?
After many tests they changed the CATs and the issue was resolved. Ask BEZ06 or go to ZR1 forum.
By the way, why didn't tech just move the injector to see if issue moved cylinders or why can't the tech tell you if it is in or out of performance tolerances...I know why and that is reason i bought the service manuals!!
