4L80 Banging. (Silverado 2500)
Thread Starter
Joined: Apr 2005
Posts: 4,085
Likes: 1
From: N. Falmouth MA
4L80 Banging. (Silverado 2500) I have a 2000 Silverado 2500 142k miles with the 4L80 4wd and I've done all the services (dex6) but once it's warmed up a little (150* trans temps) and after I romp on it, it will constantly bang every gear. Harsh engagement regardless of throttle position. I've heard that there's an issue with the shift pressure spool valve ovaling or eroding the bore in the valve body or something to that extent. So the spool valve will bypass or stick. It feels like it does because if I shut the truck off and go into a store and come back it'll be back to normal.
I don't feel like dropping the valve body but I may have to. Any cheaper or affordable replacements out there? Ideas? Is it that risky to drop the valve body and not losing any check *****? Or not that bad?
I don't feel like dropping the valve body but I may have to. Any cheaper or affordable replacements out there? Ideas? Is it that risky to drop the valve body and not losing any check *****? Or not that bad?
Last edited by bayer-z28; Nov 8, 2015 at 10:03 AM.
Thread Starter
Joined: Apr 2005
Posts: 4,085
Likes: 1
From: N. Falmouth MA
Of course it hasn't been doing it lately. I fixed an exhaust leak that I've been dealing with since I put the truck together. Was a #1 cyl primary exhaust gasket leak. Looks like the cheap gasket blew out. I put a GM gasket in. It's nice and quiet now and coincidentally the banging has stopped.
I had a bunch of codes. One for EGR which I deleted and turned the MIL off, I should set it for no error reported.
One for HO2 B1S2 for some reason.
A coolant temp sensor code for the sensor that the plastic finally broke. I superglued it back on. It broke during reassembly but was barely hanging on. I guess I nicked it when I was doing the gasket. Still works.
One for No MIL
So P0118
P0141
P0405
And MIL OFF. I had one that just said "sensor" but no P prefix.
I had a bunch of codes. One for EGR which I deleted and turned the MIL off, I should set it for no error reported.
One for HO2 B1S2 for some reason.
A coolant temp sensor code for the sensor that the plastic finally broke. I superglued it back on. It broke during reassembly but was barely hanging on. I guess I nicked it when I was doing the gasket. Still works.
One for No MIL
So P0118
P0141
P0405
And MIL OFF. I had one that just said "sensor" but no P prefix.
Whatever happened with this? Get it resolved? If you don't have any codes and with that kinda milage, try a new epc solenoid. Don't have to drop the valve body and you can do the job for less than $100.
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Thread Starter
Joined: Apr 2005
Posts: 4,085
Likes: 1
From: N. Falmouth MA
Haven't been driving it. It blew a brake line and I'm waiting for a whole vehicle pre-bent kit to come in. I have I have to re do the whole rear channel to get it drivable again. Single rear line (3ch ABS)to the left and right sides all the Way to the calipers. Everything is so rusted nothing will come apart.
I'll have to run a datalog when I get it on the road again. Thankfully I have a backup car.
I'll have to run a datalog when I get it on the road again. Thankfully I have a backup car.
Last edited by bayer-z28; Nov 20, 2015 at 04:39 PM.
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