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Old 11-25-2009, 10:27 AM   #1
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Default Anyone having a P0121 code error???

I have an 07 Tahoe LT and when driving it will throw up a P0121 code. Then of course the remote start won't work due to the SES light. I called the local dealership and they told me that the throttle body just needs cleaning. Does this sound right? I just went over my warranty a couple months ago. It's been doing this for about a month now. Any thoughts? I know of two other people around here with Silverados too. Just nobody is still in warranty.
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Old 11-25-2009, 02:52 PM   #2
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Pull the intake tube and look at the TB. Clean it it won't hurt anything.
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Old 11-25-2009, 05:37 PM   #3
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More or less clean it or replace it! Here are some repair notes from SI summed up a bit:

DTC P0121: Throttle Position (TP) Sensor 1 Performance

Circuit/System Description

The engine control module (ECM) uses the following information to calculate an expected airflow rate:
The throttle position (TP)
The barometric pressure (BARO)
The manifold absolute pressure (MAP)
The intake air temperature (IAT)
The engine RPM

P0121
DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0315, P0335, P0336 are not set.
The engine speed is more than 450 RPM.
DTC P0121 run continuously when the above conditions are met.
Conditions for Setting the DTC:
P0121

The predicted air flow and the predicted MAP combined are outside a calibrated range for more than 3 seconds.
Action Taken When the DTC Sets P0068
DTC P0068 is a Type A DTC.
The control module commands the throttle actuator control (TAC) system to operate in the Reduced Engine Power mode.
A message center or an indicator displays Reduced Engine Power.
Under certain conditions the control module commands the engine OFF.

P0121

Inspect for the following conditions:
Vacuum hoses for splits, kinks, and proper connections as shown on Vehicle Emission Control Information label
Inspect thoroughly for any type of leak or restriction
Air leaks at throttle body mounting area and intake manifold sealing surfaces
Throttle body for dirt, debris, and coking.
Inspect the throttle body for the following conditions:
Loose or damaged throttle blade
Broken throttle shaft
Any throttle body damage
⇒ If any of these conditions exist, replace the throttle body assembly.
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Old 11-25-2009, 05:38 PM   #4
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don't touch the TB whatever u do.. let the dealership do it, or ur revs will hang..
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Old 12-22-2009, 11:36 PM   #5
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im not sure if it will help, but a had the same problem with my 08 silverado, p0121, it was drivin me nuts, i assumed it had something to do with my ported tb, but i talked to a friend who is a local gm tech, he told me there was a TSB out about it and i needed to clean the throttle body and bring it to him so he could "relearn" the idle..... not sure if its gonna work, im goin up there monday, ill let you know how it works
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Old 12-22-2009, 11:39 PM   #6
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Remote start wont work with any CEL.
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Old 01-04-2010, 12:18 PM   #7
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I have HPTuners and I'm about to just disable the code. I plan on taking it up for the 60K service soon. I guess I will just let them mess with it and see what they can come up with.
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Old 01-04-2010, 12:19 PM   #8
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Quote:
Originally Posted by norris_83 View Post
don't touch the TB whatever u do.. let the dealership do it, or ur revs will hang..
I cleaned the one on my 05 Tahoe and had zero problems. Also done 3 other friends. What are you talking about?
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Old 01-04-2010, 08:36 PM   #9
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Pull it off and clean it. Wouldn't bother taking it to a dealer all they are going to do is use some 3m throttle body cleaner and clean it the same way you would. Don't be chicken it's not rocket science. Couple of rags and about an hour worth of time and you're done.
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Old 01-04-2010, 08:36 PM
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