High Ethanol Readings, 07 Silverado 1500

[Sisu8888]

Hi i have a 2007 Silverado 1500 LTZ with active fuel management/flex fuel. Ive been having check engine lights with rich codes and high ethanol readings. It is accompanied by a "kick" from 1-2 shifts, no knocks. I never put ethanol in the tank just 100% gas. I've had it flashed numerous times which makes the truck run great for awhile and the kick from 1-2 goes away, also the fuel trims reset and the problem keeps occurring, sometimes later sometimes sooner.  I found this website  Https://tis2web.service.gm.com   I entered my VIN and found an update, part number 12614088, New software to ensure proper ethanol content calculation. I also clicked on complete history and it showed this update in the history. Now my question is, this complete history shows every update that's possible for my VIN so does that mean my trucks been fully updated or would it possibly need this ethanol update to correct the problem I'm having? I'm at my wits end trying to figure out this problem.

[Jsdirt]

You'd have to access the computer info with a bi-directional scan tool - that should give you the calibration numbers of what is currently in there, and you can compare that with the new stuff.

 

I have the same truck, only an LT2, and I have to reset the fuel composition at least once a year (I only drive maybe 2k per year). This thing has been a constant headache from the minute I took it on it's test drive back in Spring of '07.  The latest, besides the failing cam bearings, is I've been driving around with a "rejected" sticker on the thing for 2 years now, since the monitors for o2 & o2 heater won't run ...  Thing has been the biggest disappointment of my life.

[Sisu8888]

17 minutes ago, Jsdirt said:

You'd have to access the computer info with a bi-directional scan tool - that should give you the calibration numbers of what is currently in there, and you can compare that with the new stuff.

 

I have the same truck, only an LT2, and I have to reset the fuel composition at least once a year (I only drive maybe 2k per year). This thing has been a constant headache from the minute I took it on it's test drive back in Spring of '07.  The latest, besides the failing cam bearings, is I've been driving around with a "rejected" sticker on the thing for 2 years now, since the monitors for o2 & o2 heater won't run ...  Thing has been the biggest disappointment of my life.

Did you get the software update/part number 12614088 done? If so did the problems reoccur?

[Jsdirt]

I don't have the funds for a J-box and laptop yet. As soon as I do, it'll be getting  all the needed updates. This thing hasn't been to any shop since the warranty ran out in '09 due to mileage, so I'm sure there's several needed.  

 

I'm a tech myself, so I'm not going to pay someone to do something I can do myself (or will be able to at some point).