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P2068 vs p2066

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Old 05-16-2018, 11:00 AM
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UROB1
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Default P2068 vs p2066

Hi all, I have a 2007 corvette C6 that was receiving a P2068 code. I've watch many videos regarding replacing the sending unit in the passenger tank from YouTube. After building up the confidence I decided to do the work myself after the $1700.00 quote I received from the dealership. The question I have is I replaced the passenger sending unit, but now after driving the car I now receive a P2066 code. Has anyone heard of this? Do I need to go back and replace the driver side sending unit as well? I ask this because the original code that I received was P2068. For those who are thinking about this work on their can I can lend some advice as I think I'm going back under my car for seconds.
Thanks
RH

Last edited by UROB1; 05-16-2018 at 04:55 PM.
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Old 05-16-2018, 03:24 PM
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[QUOTE=UROB1;1597210246]The question I have is I replaced the passenger sending unit, but now after driving the car I now receive a P2066 code. Has anyone heard of this?



Yes.
It's happened/been reported over the years.
No disrespect but it' a rooky mistake made once, if unlucky.

Old timers learned long ago w/ C6 when doing one do the other.
Heck rear end's already out, how many times does one want to go through that baloney?
Some members --FWIW-- actually do clutch at same time.
Big labor $ just dropping rear, forget parts.

Do I need to go back and replace the driver side sending unit as well?
Yes.
Don't shoot the messenger.
I pray it's something stupid like pinched wire/loose connector.
Unfortunately whatever it is has to be visible/traceable to be rectified.
And for some weird reason #1 fails after #2's replaced, or vice-versa.

I get the clutch thing, rear tranny has to come out.
But GM's design 'team' responsible for C6 sender placement need to be horsewhipped. Barred from auto design studios, forevermore.
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Old 05-16-2018, 03:44 PM
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i got the 2066 code
bought a code reader, couldnt decide what to do first so i just went to the dealer and bought a new cap..fixed the problem and hasnt thrown a code since (2months)

but tech at dealer told me if the gauge is dead, you reset the engine light and the gauge immediatly drops to E again, then you need to get in the tanks due to the contacts being corroded for the sending unit

there is a guy on youtube doing c6 fuel pumps without dropping the tanks, but he must have UBER patience to accomplish
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Old 05-16-2018, 04:04 PM
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[QUOTE=Landru;1597212064]
Originally Posted by UROB1 View Post
The question I have is I replaced the passenger sending unit, but now after driving the car I now receive a P2066 code. Has anyone heard of this?



Yes.
It's happened/been reported over the years.
No disrespect but it' a rooky mistake made once, if unlucky.

Old timers learned long ago w/ C6 when doing one do the other.
Heck rear end's already out, how many times does one want to go through that baloney?
Some members --FWIW-- actually do clutch at same time.
Big labor $ just dropping rear, forget parts.



Yes.
Don't shoot the messenger.
I pray it's something stupid like pinched wire/loose connector.
Unfortunately whatever it is has to be visible/traceable to be rectified.
And for some weird reason #1 fails after #2's replaced, or vice-versa.

I get the clutch thing, rear tranny has to come out.
But GM's design 'team' responsible for C6 sender placement need to be horsewhipped. Barred from auto design studios, forevermore.
I was able to replace the passenger sending unit with out dropping the rear end from the car. I will look into working on the driver side as soon as my part comes in. Thanks
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Old 05-16-2018, 04:12 PM
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Originally Posted by ~STOLEN~ View Post
i got the 2066 code
bought a code reader, couldnt decide what to do first so i just went to the dealer and bought a new cap..fixed the problem and hasnt thrown a code since (2months)

but tech at dealer told me if the gauge is dead, you reset the engine light and the gauge immediatly drops to E again, then you need to get in the tanks due to the contacts being corroded for the sending unit

there is a guy on youtube doing c6 fuel pumps without dropping the tanks, but he must have UBER patience to accomplish
If i'm not mistaken your saying I might need a new cap to the tank? I did have to knock on quite a bit to get it loosened . What about the driver side sending unit? what are your thoughts about that? so far just the passenger side was replaced
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Old 05-16-2018, 05:08 PM
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Don't think P2066 has anything to do with fuel cap. I believe caps are relative to evaporative/emission problems.

P2068 is for a bad passenger tank sender.

P2066 is this:
Conditions for Setting the DTC P2066
The secondary fuel tank is equal to or greater than 3.3 L (.87 gal) and the ECM does not detect a change in the secondary fuel level of at least 3 L (0.79 gal) over a distance of 100 km (62 mi).

in other words: fuel in passenger tank and you drive 60 miles and gauge level does not drop

The ECM detects that the primary fuel tank is less than 28.5 L (7.5 gal) and the secondary fuel tank is more than 3.3 L (.87 gal) and the condition is present for 30 minutes.

in other words: senders show passenger tank still has gas and the driver tank is less than full. Should stay full until passenger tank empties.

The ECM detects that the primary fuel tank is greater than 28.5 L (7.5 gal) and the secondary fuel tank is less than 3.3 L (.87 gal) over a distance of 200 km (124.2 mi).

in other words: senders show passenger tank is empty and the driver fuel level is not dropping over 120 miles.

It has to do with the 2 tank senders communicating with each other. If you drive and the senders are not doing what the computers state they should be doing, then you will get a DTC.

See above...Since the right tank empties first before the left tank, the left tank sender should not move until the right tank is empty. And then the right tank sender should stop moving and then the left tank sender starts to drop. It that doesn't happen, you get a P2066.

Not necessarily the driver tank sending unit. Suggest you clear the codes and drive a tank of gas to see what the needle is up to.
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Old 05-17-2018, 11:32 AM
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Originally Posted by UROB1 View Post
If i'm not mistaken your saying I might need a new cap to the tank? I did have to knock on quite a bit to get it loosened . What about the driver side sending unit? what are your thoughts about that? so far just the passenger side was replaced
i cant be for sure that it is the ONLY problem your facing....but sure is the cheapest place to start LOL

i dredd pulling the tanks for a problem....for a better fuel system on my own terms id be a lot happier about doing the job LOL
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