Just wanted to bump this thread. I recieved the following codes P1A26, P1A2D AND P1A34 on my 2006 GMC sierra. Trying to determine with the GMC dealership what the warranty coverage is. The guy who read the codes for me cleared them so now I have to wait for them to reappear or maybe not. If this progresses into a real issue I will post back what I find out and how we fix this.

Hi Carl,

I just began scanning this forum on behalf of the GM Social Media team a few weeks ago, and I wanted to thank you for bringing this thread to my attention. I've noted the past concerns, and I'm very interested to see any updates you may give on this topic! Glad to see you're already working towards a resolution with a GMC dealership.

If you ever have any questions regarding your Sierra, please don't hesitate to send me a direct message.

Best,

Katie
GM Customer Service