Codes P0122 and P0223, possible damaged the throttle body after cleaning it?

Tiny
CHEVYOWNER10
  • MEMBER
  • 2010 CHEVROLET AVEO
  • 1.6L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 76,000 MILES
Today i thought I would clean the throttle body. The vehicle was running fine but a little slow. So, i took everything apart to remove the throttle body from the vehicle. After i remove the throttle body i thought let me replace the throttle position sensor while it's out of the vehicle.

I saw a plastic cover on the side of the throttle body. It looked like the throttle position sensor was underneath there. So, i remove the metal clips on the side to see what was underneath. As soon i remove the metal clips the cover is stuck and will not come off. It looked like it was an electronic throttle body. I did not see any throttle position sensor under the cover. So, i put the metal clips back on and clean the throttle body.

Reinstall the throttle body into the vehicle. I made sure connectors are tight and clean with no damage to wires. After i did all of that and everything is back together i start the vehicle and my check engine light is on. I got codes p0122 and p0223. I read all the info stating why the code could be on but i did not attempt to replace anything yet. I don't know what i could have done wrong.

I took apart the throttle body again and made sure everything was installed back on the throttle body correctly. The only thing i can see is that the plastic cover isn't tight like it used to be and all the metal clips are on tight. I also made sure to install the cover lining it with the metal contacts inside.

Reinstall throttle body for the second time. All codes are still on and i can't even drive the vehicle now because the pedal cannot accel.

Do you think i damaged the throttle body because i try to remove that plastic cover? This really made me lose my mind now...


Around the mileage throttle body's go bad are usually between 60k to more. I am at the mileage to replace it anyhow. But i did not think i would damage it by removing it to clean it. Little did i know the cover would not have a throttle position sensor under there.

Here is a photo of what mine exactly looks like. If i was to replace it would this fix the issue? Also, for reference here is the throttle position sensor i bought from rock auto. But i honestly think it's no use for my vehicle.


https://www.rockauto.com/en/catalog/chevrolet,2010,aveo,1.6l+l4,1444457,fuel+&+air,throttle+position+sensor+(tps),5136
Friday, October 22nd, 2021 AT 2:09 PM

11 Replies

Tiny
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I did some research, and I might have to relearn my throttle body because I shouldn't have taken it apart to clean it and by doing that, I have confused the computer so idle will not smooth out. Is there any idea I can do a throttle body relearn without using an expensive scan tool? I do have the scanner to reset the codes. I try to reset the codes but they would not erase the throttle position sensor codes.
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Friday, October 22nd, 2021 AT 8:08 PM
Tiny
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The codes are related to TPS 1 and TPS 2. I read through the codes, and something is wrong with the wiring. You may have an open circuit, short to ground, short to power.

Remove the connectors and inspect the pins in both the TPS and the connectors. Make sure they are not bent or pushed in.

Next, check pin C for a 5v reference signal. If that is good, check pin E for ground. If that is good, check and make sure there isn't something causing an issue for pins D, E, F. They could be the issue if there is no contact or if they are damaged.

See pic 1 below. It indicates what could be the cause for these codes. If you look at pic 2 below, it shows the pin locations.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

Let me know what you find, or if you have other questions.

Take care,

Joe
.
See pics below. Also, there isn't a relearn for this vehicle. The PCM does relearn automatically.
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Friday, October 22nd, 2021 AT 9:53 PM
Tiny
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I was just wondering what you said (check pin E for ground. If that is good, check and make sure there isn't something causing an issue for pins D, E, F.)

I assume pin E would have to have a reading for ground, correct?

And I know you said pin c has to have ref voltage of 5v. But for pins D, E, F, what readings am I looking for? Sorry for the vague questions. Just trying to make sure I get the readings I need here.
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Saturday, October 23rd, 2021 AT 8:01 AM
Tiny
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No problem. Yes, pin c should provide approx. 5 v. Pin E is ground (low reference provided via the PCM) and the signal wires need to be checked with the TPS connected. You should see between 0v and 5v when moving the throttle from idle to WOT.

I hope that makes sense. Let me know if you have other questions.

Joe
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Saturday, October 23rd, 2021 AT 7:17 PM
Tiny
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Thank you. To make it clearer I will note my readings for each pin and let you know what I find. I do remember the wiring for the throttle body was not damaged or the connector. I didn't check the TPS itself on the throttle body if the connector was bad. I will keep in touch with what I find.
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Saturday, October 23rd, 2021 AT 8:14 PM
Tiny
CHEVYOWNER10
  • MEMBER
  • 93 POSTS
  • 2010 CHEVROLET AVEO
  • 1.6L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 76,000 MILES
I removed my throttle body in my car listed above (LT model) to clean the whole throttle body assembly. I might have damaged the throttle body because I try to open the electronic plastic cover and now it will not close tight with the metal tabs on it. I know now I did something wrong because after reinstalling the throttle body I got two codes p0122 and po223. The engine idles and shakes rough, and I can hardly accel the pedal driving. I checked all my work and made sure connections were clean and tight but now the computer cannot understand the throttle body, so I am getting these two throttle position sensor codes.

Should I just replace the throttle body? I think I damaged it because with an electronic throttle body you cannot open the throttle plate and pry open the plastic cover. Someone from A GM Dealer told me I had a throttle position sensor, but I do not because it's built in.

If I do replace the throttle body, can you tell me what relearn I can do after I replace it? I would appreciate it because I was about to buy a new throttle body thinking I damage it. I looked all over google and there are relearns, but I hope I don't need an expensive scan tool to relearn the throttle body. I do have a scanner to reset the codes. I try to reset codes but that didn't do anything. I hope someone can help me. I know I shouldn't have taken it apart. The vehicle was running fine before but I wanted to clean it and now I cannot even drive it.
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Saturday, October 23rd, 2021 AT 8:25 PM (Merged)
Tiny
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Hi,

Did you read my response to the original post? If so, let me know. Also, there isn't a relearn procedure for this vehicle.

I attached the directions below for removal and replacement of the throttle body. If there was a relearn procedure, it would have been included in the directions.

Let me know if this helps or if you have other questions.

Take care,

Joe

See pics below.
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Saturday, October 23rd, 2021 AT 8:25 PM (Merged)
Tiny
CHEVYOWNER10
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For this post, let's just say if the connector or throttle body needed to be replaced, what would I have to do for the PCM to learn the throttle body?

Someone said they had to replace a throttle body on this same vehicle, and they didn't need to do a relearn procedure. Idle was fine after they installed the new one and they were able to have code reset.
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Saturday, October 23rd, 2021 AT 8:25 PM (Merged)
Tiny
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Hi,

That is correct. There is no relearn. Any "relearning" will be done by the PCM within the first few miles.

Let me know if I can help.

Joe
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Saturday, October 23rd, 2021 AT 8:25 PM (Merged)
Tiny
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Joe. The connector checks out fine and the wires are fine. I was able to get a reference voltage of 5v and the other pins were around 0v to 5v with the connector connected. I also checked the pins connected at idle with wide-open throttle. All are near the value you told me they should be.

I now think I might have damaged the throttle position sensor trying to take it off and the internal parts got bent inside. I cannot remove the sensor because it's tightly placed on the throttle body assembly. So, I assume GM built the TPS with the assembly so to replace the sensor I would need a throttle body assembly. Should I just replace it since all the electrical side checks out good?
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Sunday, October 24th, 2021 AT 9:15 AM
Tiny
JACOBANDNICKOLAS
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Hi,

It sounds like the sensor itself is good, but if something was bent, that is likely where the problem is coming from. If everything electrical checks good, then I suspect it will need to be replaced. I don't like to make those decisions when I'm not there simply because the part isn't cheap.

If possible, let me know what you decide and how things turn out for you.

As always, let me know if I can help in any way.

Take care,

Joe
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Sunday, October 24th, 2021 AT 6:02 PM

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