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Old 02-16-2012, 12:52 PM   #1 (permalink)
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code p2135 reduced power

Hello and thanks for reading my post. My wife went out today and got into her car and the service engine light came on along with the traction control along with reduced power message. When they read the code it was a P2135 throttle position sensor. I was wondering if there is any troubleshooting I can do for this problem. I recently did the rear defroster repair. So I had the plugs apart in the passenger side kick panel. Does any of the wiring for the TPS go through these connections.

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Old 02-16-2012, 02:07 PM   #2 (permalink)
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I don't believe it does, and unless you had the car running when you were taking things apart, it shouldn't matter. I had that code set on one of our cars, I cleared it, and it hasn't come back since. Try resetting it for now, if the problem persists you'll need to check the TPS wiring, if that is ok, replace it.

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 02-16-2012, 02:53 PM   #3 (permalink)
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I unhooked the throttle body, checked wiring, reconnected, cleared the code and test drove it seems to be OK. I did call the dealer and they normally stock the item for around $300. They say they replace quite a few of these.

Thanks for the info.

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Old 02-16-2012, 04:04 PM   #4 (permalink)
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Yes, it's a common problem. Keep an eye on it, hopefully it doesn't come back.

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 02-17-2012, 06:49 AM   #5 (permalink)
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Quote:
Originally Posted by cowman79 View Post
I unhooked the throttle body, checked wiring, reconnected, cleared the code and test drove it seems to be OK. I did call the dealer and they normally stock the item for around $300. They say they replace quite a few of these.

Thanks for the info.
Happy to see everything seems to be alright with your Impala now, cowman79! Please let us know if you have any future concerns with the same issue, but hopefully that won't be the case.

And, as always, feel free to DM me anytime.

Best,

Katie
Chevrolet Customer Service

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Old 02-27-2012, 01:32 PM   #6 (permalink)
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Well the wife was driving the car and we had the same problem again. I took it to the dealer because it should be covered under warranty if the throttle body must be replaced. Chevrolet wants to to a throttle body clean and relearn because this is a technical bulletin from GM. They have to d this before they replace the throttle body but I have to pay $260 for this. I am on the fence about this. I can buy a new one for $146 dollars. They told me they had to relearn the throttle body if it was replaced. How difficult is this and can I do it my self.

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Old 02-28-2012, 03:42 PM   #7 (permalink)
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I imagine you'd need a tech 2 to do the relearn, which is about $2500. This is the first I have heard of them needing to charge you $260 for a cleaning before they can warranty the part, thats some bullshit. The way I see it, its a powertrain issue, so the warranty should cover the TSB if they really need to do it first. Not you.

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 02-28-2012, 04:35 PM   #8 (permalink)
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I thought it was some crap my self. We will see I hope it fixes it but I am a pessamist. There was one good thing my antifreeze use was a hard line that was covered under warranty. I was afraid it was a gasket leak.

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Old 03-05-2012, 06:34 PM   #9 (permalink)
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$260 to clean a throttle body is big time highway robbery. Just buy a $5 throttle body cleaner from auto parts store, take off the intake near the TB. Spray it around the throttle plate, use a screw driver or something to hold it open and spray some more. Reinstall everything and start the car. While you have the intake off clean the MAF sensor which should be right after the filter using a different cleaner (not TB cleaner). It is BS for GM to say spend $x amount on it so it would be covered by a warranty especially since the TB doesn't "require" any normal maintenance per GM.

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Old 03-05-2012, 07:40 PM   #10 (permalink)
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Quote:
Originally Posted by phileaglesfan View Post
$260 to clean a throttle body is big time highway robbery. Just buy a $5 throttle body cleaner from auto parts store, take off the intake near the TB. Spray it around the throttle plate, use a screw driver or something to hold it open and spray some more. Reinstall everything and start the car. While you have the intake off clean the MAF sensor which should be right after the filter using a different cleaner (not TB cleaner). It is BS for GM to say spend $x amount on it so it would be covered by a warranty especially since the TB doesn't "require" any normal maintenance per GM.
I would agree but it is done now and time will tell if it is a permanent fix.

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Old 03-06-2012, 08:27 AM   #11 (permalink)
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I wouldn't count on it, since I keep hearing constant reports now of the throttle plates wearing and getting loose, generally cleaning doesn't fix that sort of thing.

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 03-06-2012, 08:50 AM   #12 (permalink)
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I don't think It will fix it i just hope it fails before the warranty is up.

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Old 03-06-2012, 09:02 AM   #13 (permalink)
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I would try to get a written statement from the dealer about that they will fix it, how close are you to the end of the warranty?

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 03-06-2012, 09:32 AM   #14 (permalink)
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I am not sure I need to find the date it went into service to determine when the warranty ends

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Old 03-06-2012, 11:32 AM   #15 (permalink)
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Hi again, cowman! I can find the date for you if you'd like; just send me a direct message with your VIN and I will investigate.

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Katie
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