Check engine light (steady) and A6 in 2nd only
Thread Starter
Racer
Joined: Feb 2005
Posts: 278
Likes: 4
From: Havre de Grace, Maryland
Check engine light (steady) and A6 in 2nd only
Here's the story. 2009 LS3 automatic. I was driving on a very hot day around town and came to a traffic light. While waiting, with my foot on the brake, the check engine light came on, steady, not flashing, and the trans shifted to a higher (2nd or 3rd) and stayed that way until I got home, about 4 miles. Every stop and start was from that one gear. Since the speed limits were 35mph I never broke 2200 rpm. When I got home, I shut off the engine, removed the gas cap and reinstalled it to make sure it was tight. It didn't click when I removed it so it might have been loose. I then started it and still had a check engine light but the transmission worked normally. I then and rolled in and out of the driveway a few times and the last time I started it there was no check engine light and the transmission worked fine. I drove it another five miles and all is good. I guess my question is: was the gas cap the culprit causing the check engine light (emissions) and transmission to "go into a one-gear limp mode" or do I have a transmission problem?
Oh, the tranny temp was around 207.
Oh, the tranny temp was around 207.
Last edited by Akcelr8 N VA; Jun 16, 2015 at 07:23 PM.
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
Purely a guess, could have been an anomaly. Similar, singular incidents like that have been talked about over the years here.
The thing is, it's almost impossible to diagnose a trans problem these days by just talking about symptoms. My suggestion, IF it happens again, try to get to someplace like Autozone or a dealer and get the OBD trouble codes read. Then we could have something to talk about.
Hope it was just the one time.
The thing is, it's almost impossible to diagnose a trans problem these days by just talking about symptoms. My suggestion, IF it happens again, try to get to someplace like Autozone or a dealer and get the OBD trouble codes read. Then we could have something to talk about.
Hope it was just the one time.
Thread Starter
Racer
Joined: Feb 2005
Posts: 278
Likes: 4
From: Havre de Grace, Maryland
Purely a guess, could have been an anomaly. Similar, singular incidents like that have been talked about over the years here.
The thing is, it's almost impossible to diagnose a trans problem these days by just talking about symptoms. My suggestion, IF it happens again, try to get to someplace like Autozone or a dealer and get the OBD trouble codes read. Then we could have something to talk about.
Hope it was just the one time.
The thing is, it's almost impossible to diagnose a trans problem these days by just talking about symptoms. My suggestion, IF it happens again, try to get to someplace like Autozone or a dealer and get the OBD trouble codes read. Then we could have something to talk about.
Hope it was just the one time.
For additional clarification, when the check engine light came on and the transmission went into a "one gear limp mode" I put it in sport mode and used the paddle shifter but the Heads Up wouldn't display the gear and it stayed in the "one-gear mode". Would a loose gas cap and resulting check engine light cause this?
Last edited by Akcelr8 N VA; Jun 16, 2015 at 08:30 PM.
Racer
Joined: Mar 2015
Posts: 285
Likes: 6
No, a gas cap cannot do that. It seems form the information given it's possibly an intermittent short in your transmission harness or connector. Most likely a speed sensor, gear position or shift solenoid.
A scan will confirm.
A scan will confirm.
Thread Starter
Racer
Joined: Feb 2005
Posts: 278
Likes: 4
From: Havre de Grace, Maryland
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Thread Starter
Racer
Joined: Feb 2005
Posts: 278
Likes: 4
From: Havre de Grace, Maryland
We have a winner!!
It was a p0700 code and no sub codes. According to the diagnostic guide for P0700, it's a communication problem and lo and behold, one of the things to check is a low FOB battery... BINGO... battery is just about dead! New battery, cleared the code and no further problem, at least in the 10 miles I drove today. Thanks everyone for your input. I never would have thought the FOB was the culprit! It was a cheap fix! I hope this post helps someone in the future with the same problem.
Heel & Toe
Joined: Apr 2021
Posts: 21
Likes: 5
We have a winner!! It was a p0700 code and no sub codes. According to the diagnostic guide for P0700, it's a communication problem and lo and behold, one of the things to check is a low FOB battery... BINGO... battery is just about dead! New battery, cleared the code and no further problem, at least in the 10 miles I drove today. Thanks everyone for your input. I never would have thought the FOB was the culprit! It was a cheap fix! I hope this post helps someone in the future with the same problem.
It was a p0700 code and no sub codes. According to the diagnostic guide for P0700, it's a communication problem and lo and behold, one of the things to check is a low FOB battery... BINGO... battery is just about dead! New battery, cleared the code and no further problem, at least in the 10 miles I drove today. Thanks everyone for your input. I never would have thought the FOB was the culprit! It was a cheap fix! I hope this post helps someone in the future with the same problem.