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Old 07-05-2020, 04:48 PM   #1
Ikankerr
 
Drives: Looking
Join Date: May 2020
Location: Houston
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A8 problems

I just purchased a 2016 2ss yesterday and today the cel came on and the transmission started not wanting to shift and the D was flashing on the cluster. The codes are

P0700 just a generic tranny code
P0658 this says Actuator Supply Voltage – Circuit Low

I know they are both to do with the transmission. If I clear the codes it drives normal until I park it, but then they come back. Do I need to reflash the pcm and tcm or does the harness need replacing. I searched on here but I couldn’t find any clear answers.those where the only two possible solutions I could find.


I told my wife I could teacher her to drive a 6spd, but she had to have an a8.
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Old 07-05-2020, 08:27 PM   #2
arpad_m


 
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Unwind the deal if this wasn't disclosed prior to sale, or take the car to a competent dealer or a mechanic who knows the A8 well and get the trans fixed up properly. Helpful as most people in this forum are, I don't think anyone can responsibly diagnose and solve your problem over the internet based on just a generic and a specific code. You can roll the dice, but these tranny issues are best left to experts.
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2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq

Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods
JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune

1100 - 1/30/18 | 2000 - 1/31/18
3000 - 2/06/18 TPW 2/26/18
3400 - 2/19/18 | 3800 - 2/26/18
4300 - 2/27/18 | 4B00 - 3/01/18
4200 - 3/05/18 | 4800 - 3/14/18
5000 - 3/16/18 | 6000 - 3/19/18
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Old 07-05-2020, 09:34 PM   #3
Mark114

 
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Quote:
Originally Posted by arpad_m View Post
Unwind the deal if this wasn't disclosed prior to sale, or take the car to a competent dealer or a mechanic who knows the A8 well and get the trans fixed up properly. Helpful as most people in this forum are, I don't think anyone can responsibly diagnose and solve your problem over the internet based on just a generic and a specific code. You can roll the dice, but these tranny issues are best left to experts.
Agreed. Hopefully you have a few days to return and walk away. Take it back and get the dealer to fix it or walk away from the deal.
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Old 07-05-2020, 09:45 PM   #4
Ikankerr
 
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Thanks guys, I’m going to try and take it to a dealer tomorrow. Hopefully, they can fix it. If not I’ll be going back to the dealership that sold it to me.
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Old 07-06-2020, 10:00 AM   #5
arpad_m


 
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Good luck, mate
...and before I forget (where were my manners), to the forums, hope this will get fixed up and you'll soon be able to the beast.
__________________
2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq

Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods
JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune

1100 - 1/30/18 | 2000 - 1/31/18
3000 - 2/06/18 TPW 2/26/18
3400 - 2/19/18 | 3800 - 2/26/18
4300 - 2/27/18 | 4B00 - 3/01/18
4200 - 3/05/18 | 4800 - 3/14/18
5000 - 3/16/18 | 6000 - 3/19/18
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Old 07-06-2020, 02:32 PM   #6
Ikankerr
 
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Woke up this morning turned the car on and it was gone. Drove it over two hours and it was fine. Dealership said it might have been a glitch.
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Old 07-06-2020, 10:58 PM   #7
DougCBJ
 
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of course they did.
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Old 07-07-2020, 09:52 AM   #8
Ikankerr
 
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Wife drove it across town 40miles to work and didn’t have any problems. Fingers crossed it was just a glitch.
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Old 07-08-2020, 11:12 AM   #9
arpad_m


 
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Apart from a bad electrical connection, it could be a weak battery, too. If the car still has the original battery, you may want to replace it anyway.
__________________
2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq

Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods
JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune

1100 - 1/30/18 | 2000 - 1/31/18
3000 - 2/06/18 TPW 2/26/18
3400 - 2/19/18 | 3800 - 2/26/18
4300 - 2/27/18 | 4B00 - 3/01/18
4200 - 3/05/18 | 4800 - 3/14/18
5000 - 3/16/18 | 6000 - 3/19/18
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