2001
That code is for the transmission. It indicates a mechanical failure within the transmission. There is a technical service bulletin issued by GM in regards to it. TSB# 01-07-30-036C. If the car is under warranty GM will fix it. If not, cost of repair will has to be paid by you. This issue is related to 2nd and 3rd gears, could has debris in orifice #29 inside transmission.
SOURCE: replace the single light bulb on my 2001 Chevy Impala front
THE CORNER LAMP? next to headlight? there is a philips screw on top of light assembly will see it when you open hood remove screw and light will come out
SOURCE: Chevy Impala 2001 w/ 3.8L engine - EGR stuck open
there are a couple of things, first make sure there are not restriction in the exhaust, i know the dealer has had to replace converters under warranty because of this problem, then theres a reflesh program for the computer due to this problem, and lastly,run with egr off make sure it clean of carbon,carbon gets stuck in pintle sets check eng lightbut carbon then blows by so when you remove egr you see nothing, well start with these good luck.
SOURCE: what does error code p0420 in chevy impala 2001
I meant to post that as a solution.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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