DTC P2066 Fuel Level Sensor "B" Performance
Thread Starter
2nd Gear
Joined: Oct 2010
Posts: 2
Likes: 0
From: Fairfield CA
DTC P2066 Fuel Level Sensor "B" Performance
Howdy Folks,
Can anyone offer any advice about this?
I recently had to reset a DTC, P2066, to restore operation of the fuel gauge in my 2008 C6 (33k mi). I'm wondering if this is a common problem, if I can expect it to recur and if there is a reliable fix.
The fuel gauge dropped to empty during some aggressive driving on my favorite CA switchbacks with the fuel tanks about 1/3 full. Eventually the DIC displayed "Service Fuel System." Later, a scan revealed the P2066 Fuel Level Sensor "B" Performance DTC. Resetting it restored operation of the fuel gauge.
Thanks for your help, Huc
Can anyone offer any advice about this?
I recently had to reset a DTC, P2066, to restore operation of the fuel gauge in my 2008 C6 (33k mi). I'm wondering if this is a common problem, if I can expect it to recur and if there is a reliable fix.
The fuel gauge dropped to empty during some aggressive driving on my favorite CA switchbacks with the fuel tanks about 1/3 full. Eventually the DIC displayed "Service Fuel System." Later, a scan revealed the P2066 Fuel Level Sensor "B" Performance DTC. Resetting it restored operation of the fuel gauge.
Thanks for your help, Huc
Last edited by HucFinn; Jun 14, 2011 at 10:37 PM.
Le Mans Master
Joined: Dec 2004
Posts: 5,492
Likes: 808
From: West coast CA
Howdy Folks,
Can anyone offer any advice about this?
I recently had to reset a DTC, P2066, to restore operation of the fuel gauge in my 2008 C6 (33k mi). I'm wondering if this is a common problem, if I can expect it to recur and if there is a reliable fix.
The fuel gauge dropped to empty during some aggressive driving on my favorite CA switchbacks with the fuel tanks about 1/3 full. Eventually the DIC displayed "Service Fuel System." Later, a scan revealed the P2066 Fuel Level Sensor "B" Performance DTC. Resetting it restored operation of the fuel gauge.
Thanks for your help, Huc
Can anyone offer any advice about this?
I recently had to reset a DTC, P2066, to restore operation of the fuel gauge in my 2008 C6 (33k mi). I'm wondering if this is a common problem, if I can expect it to recur and if there is a reliable fix.
The fuel gauge dropped to empty during some aggressive driving on my favorite CA switchbacks with the fuel tanks about 1/3 full. Eventually the DIC displayed "Service Fuel System." Later, a scan revealed the P2066 Fuel Level Sensor "B" Performance DTC. Resetting it restored operation of the fuel gauge.
Thanks for your help, Huc
This problem always happens to the right tank because the right tank empties first. The level sender in that tank therefore spends most of its time un-immersed in gasoline, which is when they go bad.
If you examined the sensor contacts from both tanks you'd see the left ones were shiny and the right ones were dingy and grey.
Bad sensors also seem to work better when immersed, so the problem usually starts when the car approaches 1/2 tank. But eventually it gets worse.
You can pour a bottle of Techron concentrate in the tank for some temporary relief, but in my experience the problem eventually comes back.
The fix: drop the tank and change the sensor. And thereafter, make sure to fill up more often so the right tank doesn't spend a lot of time empty.
Thread Starter
2nd Gear
Joined: Oct 2010
Posts: 2
Likes: 0
From: Fairfield CA
Thanks for the feedback. I've always used Chevron's premium gas in this car, so I doubt additional Techron will help.
Given the number of complaints I've read about this problem, I'm very disappointed with Chevy's failure to develop a solution after so many years.
I’ve put well over 100k miles on each of several cars and trucks over the past fifty years and never had a fuel level transmitter or receiver fail before now.
Being a licensed control systems engineer and having developed complex control systems for major oil companies for a few decades, I would never have expected such a simple system to have such a high failure rate.
Having said all that, this ragtop blows the doors off of anything I’ve driven before. So I'll put up with dropping a tank now and then.
Given the number of complaints I've read about this problem, I'm very disappointed with Chevy's failure to develop a solution after so many years.
I’ve put well over 100k miles on each of several cars and trucks over the past fifty years and never had a fuel level transmitter or receiver fail before now.
Being a licensed control systems engineer and having developed complex control systems for major oil companies for a few decades, I would never have expected such a simple system to have such a high failure rate.
Having said all that, this ragtop blows the doors off of anything I’ve driven before. So I'll put up with dropping a tank now and then.
Racer
Joined: Aug 2007
Posts: 443
Likes: 37
From: LA CA
I use a lot of chevron as well, but still, a heavy dose of techron once in a while seems to help. I have an 08 as well with ~90k miles, and this has only come up twice so far... I agree it should be fixed by the factory, like so many other things. But once you know what it is, it's easy to work around it (ie: resetting the code, techron, keeping the tank empty less).
Btw, the error condition fallbacks on this car are ridiculous. One out of three throttle pedal sensors glitches for a moment - reduce engine power to 5% until you shut the car off; thermostat goes bad and slow to get up to temp - temp gauge goes to 0 and "engine overheating" screaming and never goes away till code is reset; one fuel level sensor glitches for a moment, fuel gauge shows empty forever...
Btw, the error condition fallbacks on this car are ridiculous. One out of three throttle pedal sensors glitches for a moment - reduce engine power to 5% until you shut the car off; thermostat goes bad and slow to get up to temp - temp gauge goes to 0 and "engine overheating" screaming and never goes away till code is reset; one fuel level sensor glitches for a moment, fuel gauge shows empty forever...
Melting Slicks
Joined: Sep 2011
Posts: 3,018
Likes: 171
From: Vancouver Island
This just happened to me. After a day's casual driving, as I was parking the car I heard a chime, and got the DIC messages "Service Fuel System" and "Low Fuel". The gauge was reading dead empty, below E, even though I knew I had between a third to a half tank. Tried a fill up, but after a day's driving saw no change. My code reader showed the P2066 code, I cleared it, fired the car up and everything was back to normal.
I have used nothing but Chevron 94 for the past three years, and usually fill up when I get down around a quarter of a tank full. I'm going to run a bottle of Lucas Fuel System Deep Cleaner through the next fill up (can't buy Techron by the bottle in Canada), and I think I'm going to get in the habit of refuelling at the half full mark, just to keep the sensors constantly bathed in fuel. Can't hurt. Plus, I'm, I'm on my second fuel pump, no idea why the first one packed it in but keeping the tank half full may help keep the pump cool. It costs way too much money if you have to drop the tanks to fix these issues.
I have used nothing but Chevron 94 for the past three years, and usually fill up when I get down around a quarter of a tank full. I'm going to run a bottle of Lucas Fuel System Deep Cleaner through the next fill up (can't buy Techron by the bottle in Canada), and I think I'm going to get in the habit of refuelling at the half full mark, just to keep the sensors constantly bathed in fuel. Can't hurt. Plus, I'm, I'm on my second fuel pump, no idea why the first one packed it in but keeping the tank half full may help keep the pump cool. It costs way too much money if you have to drop the tanks to fix these issues.
