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So I had a highway event 2 times within 7 months. Cruise control set to low 70s and then a load (high winds or rolling windows down). The RPMs shot up then dropped and the temperature began to climb. Both times, I pulled over and turned the truck off. Rpms were up a little higher than normal after but temperatures dropped and then read P0700 and P0741 codes. My mechanic tried a new valve body kit but it didn’t clear the codes. We rebuilt the transmission. Same thing happened 6 months later. Doing research I see that the thermal bypass valve on my 2015 silverado 4.3 v6 is known for locking up and being bad. My mechanic is unsure that it is that but also told me the scan would read a code for that even though it’s a fully mechanical valve.
What makes this problem better or worse?
Small load change
How long has your 2015 Chevrolet Silverado 1500 had this problem?
A few days
1 Reply
Hi - Dave here, contributing to RepairPal and providing expert advice since 2010. P0741, if this is believed to be the main symptom relative to trouble code, is for a torque converter clutch circuit problem. My impression is that you have an unresolved transmission concern, likely related to the torque converter. I do not believe your mechanic has successfully addressed your vehicle's symptoms. "Rebuilt the transmission" leads to concerns about the quality of the build, the components used, any components not replaced. The fluid condition, the cooler condition, fluid flow and things of that nature. Was the torque converter replaced or reused? It would seem that a second outside opinion hands on would be of benefit - even if your mechanic wouldn't prefer that! Seek guidance at a shop near you. https://repairpal.com/auto-repair-near-me Click the link to find some shops near you who can help out!