What codes are stored and do u Have check engine light too

 

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I’m sorry you are experiencing this issue with your vehicle. You stated that you contacted GM Customer Service, would you please provide your case number, so I can look into this further?

Louis
GM Customer Service

 

Hello,

I took the advice posted by 25homes regarding alcohol content. I too was experiencing STABILITRAK and TRACTION CONTROL when slowing down at stop lights and hated the hard 1-2 kick. I measured the alcohol level with my scan tool and it read 74.9 %, having only used regular unleaded.

The dealer wanted to charge a diagnosis fee of $100 and wanted to remove the tank for inspection (extra fees) rather than simply reset the fuel trim values (which I understand, they want to make sure they are doing the right thing). However, I found somewhere else to reset the alcohol fuel trim values back to normal 3.1 % and the errors have since gone away ( only been this morning ). I will post back if they return. But no more P0172 P0175 and C0561.

Hope this helps.

 

y2kcortez Welcome to the forum...
Thanks for taking the time to follow up with what you found , that is some really good info to know...
How did you reset the values? just disconnect and reconnect the battery?

 

I bought a scan tool Actron CP9580 on ebay that allows you to read all the error codes, as well as monitor real time data for all the sensor readings in the vehicle. This is how I saw the alcohol content at 74.9 %. Not sure what caused it, but likely a fuel additive.

This tool was NOT capable of resetting fuel trim values and disconnecting the battery did not work ( did so multiple times overnight ).

A more expensive tool is needed. It is a GM Tech 2 scan tool (google if you'd like). All dealers have these whereas few local mechanics carry them (too expensive). But once the tool is connected, it takes 10 seconds to reset the trim values. The college where I work has a GM certification program and used their tool to reset.

Best of Luck

 

Thanks for that clarification
I too have the same Actron device CP9185, and I have seen my alcohol content at 20% but the pump says up to 10%
I do use Techron form time to time so just maybe it was the additives making the difference..

 

Are you having the same symptoms of SERVICE STABILITRAK and TRACTION CONTROL? If so, worth a shot to get the fuel values reset, assuming you can find a dealer or someone that will do so directly without the need for their own diagnosis.

 

Knock on wood, my 07 has been a cherry... about to roll over 81k, the only problems is the peeling steering wheel, and I had the drive shaft yoke replaced for a clunking several years back under warranty....I go thrugh batteries about every 2 years...
I have it regularly serviced at the dealer, use only M1 since new, and change oil and filter per the OLMS.

 

[/QUOTE]

THANKS FOR THE POST! I was get codes p0172, p0175 and c0561-71 checked the fuel alcohol and was reading 74% I reset it and it started reading 3% almost immediately kicked off my stabilitrack dic and check engine light. My truck was also shifting hard from 1st to 2nd gear and that cleared up immediately also! My scanner was the best investment I ever made...scanner + google search= free fix! Thanks again for the help

 

I just replaced both front Bearings and Hubs on my 2006 Tahoe Z71 (4WD). After completing the install, I started the engine and the Brake and T/C warning lights stay on. I tried to reset by disconnecting the battery, but that didn't work. Does anyone have a solution. Thanks.