UPDATE 3:
Supposedly you need any cluster OTHER THAN a WT model cluster to have full steering wheel functionality. Went back to the part truck and removed the all terrain cluster, trim, and snipped as many wiring harnesses as possible to pull out the factory terminal leads if needed 😂 that poor donor truck…
As of right now I’m relying on Darth_Vader’s thread and YouTube videos.
will update.
The “engine hours” display is there because the truck detects the key presence as you were thinking.
My first step would be to call a dealer service person and ask if this a known issue and how they deal with it. If you don’t get meaningful advice there, i would try a couple of DIY things before bringing it in for troubleshooting/repair.
It sounds like a mechanical key detection switch is stuck, but I have not actually seen what the internals look like. Maybe spray some Caig Deoxit (electrical contact cleaner) in the key hole and work the key in and out in case it’s an electrical contact cleanliness issue. If that doesn’t work, next apply whatever lubricant GM recommends and work the key in and out a few times.
Good luck with it.
Carbon on valves would be the least of my worries on a light duty, 1500-series pickup with 357k provided the engine still ran halfway decently. Everything else is likely toast, on its way out, or has already been mauled to death by cheap mechanics and backyard fixes. Those kinds of trucks nickel and dime a guy to death.
I wouldn't think having the top end cleaned once or twice would be a big deal on a 5.3 but maybe it is?
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