UROB1

Landru

[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.

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.

~STOLEN~

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

UROB1

[QUOTE=Landru;1597212064]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

UROB1

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

C6ToGo

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.

~STOLEN~

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

gregrtaylor

I'm experiencing a nightmare with my 2015 C7 Stingray. Had a P2068 code, dealer replaced sensor in drivers side tank (doesn't P2068 tell you to replace passenger side?). The sensor replacement didn't solve the problem so they kept looking and found a rodent had chewed through the passenger side rear wheel well and chewed some wires off. They replaced the wire harness and well cover.

Now within a week the gauge stopped working again. This time I pulled a P2066 code. Dealer says now they have to replace sensor in passenger side tank which requires dropping the axle etc.

In this case above does a P2068 relate to passenger side and P2066 relate to driver side?

Any ideas, suggestions are appreciated.....GT in AZ

12vette34

Great workup explaining P2068 code.

2StrikeHtr

12vette34, I agree - it is a good explanation. Ha, ha, I have to thank you for resurrecting a thread from 2018 or I wouldn't have seen it ! Hope you're not having fuel tank problems ... Tom