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Infotainment on 2019 silverado erratic issues

luis a. Calo

By luis a. Calo
in Troubleshooting & Recalls

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    • jl6690506
      Wow I'm in a pickle. (Broke down truck) and a story.

      By jl6690506 · Posted

      The 92-95 SCPI spider injectors are notoriously problematic and hard to source new replacements. I’d pull the intake manifold first to inspect cracked lines and brittle plastic legs before dropping $350 on a rebuild. The 1.5 OBD system only offers limited data, no misfire tracking, which is normal for this 1995 model. Enjoy the project!
    • Coastie05
      2019 GMC Sierra 1500 - 8l90

      By Coastie05 · Posted

      Yea a fluid change is in order here. Honestly, your transmission didn’t even get hot. During the summer in stop and go traffic I’ve seen my 8l80 get up to 216 and it was still shifting smoothly. 
    • newdude
      2019 GMC Sierra 1500 - 8l90

      By newdude · Posted

      I'd change the fluid and start there.   198F is nothing for the 8L90.  They typically operate 180-200F stock.  
    • LCH14
      2019 GMC Sierra 1500 - 8l90

      By LCH14 · Posted

      Looking for help!   2019 GMC Sierra 1500 - 5.3l 4x4 8l90 61k miles - truck is in Arizona, was over 110 outside on Monday when this whole situation transpired. Never had any major issues with transmission until this point:   Truck sat outside my construction office for approx 1 hour idling before I realized, ran around the job site wrapping some things up for the day and then left. Went to get food and sat in the drive through for approx 30 minutes idling. As soon as I pull out of the drive through and onto the main road, rear tires lock up and feels like transmission fell out of the truck. Shifted to park, shut the truck off and tried again, same thing happened. Was able to reverse into parking lot (truck slammed into reverse). Let the truck sit turned off for 10 minutes before trying again, but it continued to happen. Towed truck back to my house. Highest the trans temps reached was 198.   Friday, after work I start looking into the situation. Truck sat in my driveway untouched all week. Truck is now driving like normal, transmission doesn’t get over 185 degrees when trying to heat it up. Got up to 60 multiples times with no issues, no issues accelerating, only down shifted hard into first one time at 185 degrees. Does anyone have any insight? Never through a code or a check engine light. Truck has never been used to tow either. No transmission services at this point.
    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      Atlas won.   I know better, but I did it anyway. I took a compressed air line with a chuck and rubber tip and jammed it in the open EGR port. The port was clear as far as I could see, and as far as I could poke with a flexible wire, but that doesn't mean it's not clogged.   Compressed air blew back at me along with a cloud of black. Oops. I didn't have the rubber tip seated in there all the way. Jammed it up in there some more and squeezed the chuck. PSI was set to 120. Poof! It blew back at me again. Third time...pfffffttssssssspffffffsssfffffff, face full of carbon, and then, kind of a thud..and the air stopped spraying back at me. It was now exiting the exhaust with a low shhhhhh sound as it flowed through the pipe. Something broke free. I pressurized the port again, and air flowed.   Made my day.   Long story short on this problem, it's fixed. Something was really blocking the EGR passages down low, and compressed air blew it apart. I don't recommend this as who knows what debris was sent where. But it's allowed me to move forward, mentally, and onto the next problems I need to get this little S-Blazer going down the road properly again.  

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