I am new to this forum and new Bonneville owner so any help is much appreciated. I have a 2001 Bonneville SSE 135k miles (I believe its SSE idk how to tell the difference but its not base) that I just bought... I have a P0420 code coming up and thought it was because I had a vacuum leak but I fixed it and code is still there. Also the car keep dying on me but not while driving only when its at a complete stop and/or coming to a stop (fuel pump?) The last issue is the power windows, door locks and mirrors do not work there are no lights on the buttons on any of the doors except the driver door. I saw in forums about a crappy splice I removed it and respliced but no dice...
I heard the motors and transmissions on these thigs are awesome so I picked it up at what I thought was a descent price now just need some helpful pointers to get me in the right direction on this thing.

Thanks again

check the MAF sensor that is a common problem and will cause shut off at low rpms!

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Member #3848
2002 Black Bonneville SE Sold But Not Forgotten
2002 White Bonneville SSEi Project car

Only way to check it is pull it and clean it right or just replace?

The dying issue could be a bad crank position sensor.

Windows would either be water leaks or door module.

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-Car Guy Carl
"Penelope" - 2003 SLE - 247k Miles
"Sydney" - 2000 Honda S2000 - 98k miles

You can pull it and clean it with some MAF cleaner spray, if it is really nasty you can GENTLY!!! rub them with a q-tip soaked in the cleaner. The wires are very small and delicate so they will break if they get pushed too hard.

As for the windows and locks not working, all those symptoms lead to the drivers door switch being bad.

We will get you all straightened around with your car

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Ryan

2003 Bonneville SSEi - The Black Mirror SOLD!
2002 Bonneville SE - The Mutt Complete 2004 SLE interior, drivetrain, and body harness swap, ECC swap, HUD swap, black GXP wheels, GXP headlights and tinted tails - SOLD
2003 BMW 540i M Sport, 2001 BMW X5 4.4i, 2010 GMC Acadia, 2017 Grand Design Imagine 3150BH
1982 Cutlass Supreme - The fun one

Thanks man ill pull the MAF see what im looking at... do you mean the whole driver door button panel is making all of them not work? Any ideas on the P0420 code I heard with chevy it pretty much points to the cat conv I know thats what it was with my trailblazer

Not sure on the code, it is a pretty common code to come up though, do some searching here on it and you will find a ton of info on it.

Yes, I mean the master window switch mounted on the drivers door, fairly common issue and when that dies out the other windows won't work, power locks tend to have issues, and memory seats won't work either.

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Ryan

2003 Bonneville SSEi - The Black Mirror SOLD!
2002 Bonneville SE - The Mutt Complete 2004 SLE interior, drivetrain, and body harness swap, ECC swap, HUD swap, black GXP wheels, GXP headlights and tinted tails - SOLD
2003 BMW 540i M Sport, 2001 BMW X5 4.4i, 2010 GMC Acadia, 2017 Grand Design Imagine 3150BH
1982 Cutlass Supreme - The fun one

Something I forgot to add the volt meter in the gage cluster jumps around between 12 and 15 volts. .. the battery is brand new tested good and so dis the alternator.. still thinking MAF?

Are all the leads on the battery tightened down? Everything clean and corrosion free? Those are some areas to check for jumping voltage.

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-Car Guy Carl
"Penelope" - 2003 SLE - 247k Miles
"Sydney" - 2000 Honda S2000 - 98k miles

Already checked all that and looks good