P2122 Code, Accelerator or Throttle Body? - Chevy Impala Forums
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post #1 of (permalink) Old 03-29-2018 Thread Starter
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P2122 Code, Accelerator or Throttle Body?

Hello all, I haven't posted here in a very long while! Was hoping you all could help me on this one.


Yesterday, I'm at work in a meeting and I get a panicked text message from my wife. She was going to lunch in her 2011 Impala (about 65,000 miles on it), and she got a couple of messages that popped up on her instrumentation panel. First one was "Engine Power Is Reduced," the next one was "Service Traction Control." She got another message, but she was freaking out so much she neglected to get the third one. She said that it was acting kind of sluggish, but it was still drivable. I tell her to park the car, and I'll come get her.


An hour later, I get another message that says that when she put the key in and started the car back up, the messages weren't there any longer, but the check engine light was now illuminated. I go to her job, and follow her home as she's driving (I have a stick that she can't drive). She tells me that other than the check engine light, all of the other messages were gone and that she has no problems driving all the way home.


When we get home, I stick my cheap OBD-II scanner on the car, and I get a code P2122. Now, I'm not sure which OBD code website to believe...one says it's the accelerator pedal, another says it's the throttle body sensor. I purchase both a throttle body (cheaper from where I could get one than getting just the sensor) AND a new accelerator.


The throttle body is the AC Delco one that comes with the sensor, and the accelerator I got from Advance. Everyone I've asked about the parts say they're both plug and play, but I've seen instances where that isn't the case online. My question is this:


Will I have to do a relearn on the ECM? If so, what is the 100% correct way procedure to do this? I've seen videos out there where people are letting their cars stay in ignition but not running for like 10 minutes - which boggles me, because I'd believe the battery would be dead, right? I definitely don't want to deadline the car...


I haven't taken anything off....yet...
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post #2 of (permalink) Old 03-29-2018
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I've heard of issues with the pedal position sensor with these Impalas. Personally, I'd try replacing it first and it's super easy to replace (it's the actual gas pedal with a sensor built into it, correct?). I don't think you need to do anything special when replacing this - should be plug and play as far as I'm aware.

Not sure about the throttle body on the pre-2012's. On my 2012 8th gen, I've replaced the throttle body without issue (nothing special needed done) - just remove and replace (4 bolts and an electrical connector). Not sure about the pre-2012 8th gens though.

I'd start with the pedal and go from there.

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Originally Posted by jtrosky View Post
I've heard of issues with the pedal position sensor with these Impalas. Personally, I'd try replacing it first and it's super easy to replace (it's the actual gas pedal with a sensor built into it, correct?). I don't think you need to do anything special when replacing this - should be plug and play as far as I'm aware.

Not sure about the throttle body on the pre-2012's. On my 2012 8th gen, I've replaced the throttle body without issue (nothing special needed done) - just remove and replace (4 bolts and an electrical connector). Not sure about the pre-2012 8th gens though.

I'd start with the pedal and go from there.

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Thanks - I'll post an update after I change the part tomorrow. I went ahead and grabbed up a throttle body (just in case) as I'd hate for my wife to be driving down the road and get this all of a sudden.
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post #4 of (permalink) Old 03-29-2018
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The "drive by wire" accelerator pedals get a lot of use of course (as does everyone's). This device is really taken for granted by most of us. I read that the early Impala's didn't throw a code when these devices crapped-out. It's true, mine didn't. So try that first would be my suggestion.

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UPDATE: Hello all! I went ahead and swapped out the pedal yesterday evening, worked like a charm! I'll hold on to that throttle body, just in case, however....
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post #6 of (permalink) Old 03-30-2018
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Good news! Thanks for reporting back - will be useful for other members in the future.

Just curious - how much did the new pedal cost? Regardless, I'm sure you saved a small fortune over what a dealership would charge you to replace it (it's probably like you got a free throttle body *and* saved money!). :-)

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Wish I could have gotten to this post earlier.
The 2009 threw 2011 Chevrolet Impalas have special warranty coverage on the accelerator pedal assembly due to a broken solder connection in the APP sensor. Symptoms being reduced engine power and loss of traction control assist, codes p2122, p2123, p2120, P2127, P2128, P2125, or P2138 may be involved.
For a period of 10 years or 120,000 miles (193,000 km) from when the vehicle was first placed into service regardless of ownership the accelerator pedal assembly will be replaced with a newly redesigned accelerator pedal assembly part #22742315 at no charge. See TSB #14636.

This part could have been free!

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post #8 of (permalink) Old 03-30-2018
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^ Alex, I'd return both parts and head to the dealer, lol! Bart, does GM (Chevy) offer any other special warranty coverage on common/high fail parts like the hub harnesses, evap components, etc.???
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Well, damn - I stand corrected - I guess it would have actually been *cheaper* to take it to a dealership in this case! :-) That's not something you see very often!!

I'm curious if there is any way to know this other than talking to a dealership? Is there some way to look for this kind of stuff online (where Chevy offers "special" warranties for certain parts)?

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Last edited by jtrosky; 03-30-2018 at 07:56 PM.
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post #10 of (permalink) Old 03-31-2018
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^ Alex, I'd return both parts and head to the dealer, lol! Bart, does GM (Chevy) offer any other special warranty coverage on common/high fail parts like the hub harnesses, evap components, etc.???
GM does offer extended warranties on certain parts from time to time but not too often. Other than having your dealer do a vehicle history check to see any applicable warranties are still available having an account here - https://my.chevrolet.com/warranty_unauth - you may be able to see any extended warranties that are available. I do know you can see any original factory warrantie, powertrain and bumper to bumper, coverage you have left and can find a lot of info about your vehicle at this sight.

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post #11 of (permalink) Old 04-01-2018
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I actually got that TSB for a 2008 Pontiac G6 coupe I had for the throttle position sensor. The Dealership when inspecting the car before I sold it at 125K said that if "reduced engine power" or a code for that came up they would replace something. Never came up, but the years may be more than 09-11 Impalas. My G6 wasn't a flex fuel version.

2011 Impala LT
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Well all, I spoke with one of the Chevy dealers yesterday, and they gave me the reimbursement form. I submitted all of the pertinent information to them, and I'm expecting to hear back soon. This forum is a godsend!
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post #13 of (permalink) Old 04-06-2018 Thread Starter
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Originally Posted by jtrosky View Post
Good news! Thanks for reporting back - will be useful for other members in the future.

Just curious - how much did the new pedal cost? Regardless, I'm sure you saved a small fortune over what a dealership would charge you to replace it (it's probably like you got a free throttle body *and* saved money!). :-)

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New pedal cost about $96.00 with tax here in NE.
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post #14 of (permalink) Old 04-11-2018 Thread Starter
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Well, that was short-lived... Just got a text from the wife... All three messages just popped up again... What next everyone?
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post #15 of (permalink) Old 04-11-2018
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Well that sucks!!! If you still have the throttle body, I would try that next. Also, check the codes again just in case they are any different this time.

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