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Dan, Technician
Category: Chevy
Satisfied Customers: 24582
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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I have a 2009 suburban and im getting the P0121 code I have

Customer Question

I have a 2009 suburban and im getting the P0121 code I have done an Ohm test on the pedal and it seems to be working fine
JA: Just to clarify, what's the exact code? And have you tried to reset it?
Customer: P0121
JA: Are you fixing your Suburban yourself? What have you tried so far?
Customer: yes I am so far i hav ejust checked the pedal position sensor
JA: Anything else you want the mechanic to know before I connect you?
Customer: I reseted the codes on the ECM and the code still remains
Submitted: 11 months ago.
Category: Chevy
Expert:  Dan replied 11 months ago.

Hello, my name is ***** ***** I'm here to help get your problem solved.

Expert:  Dan replied 11 months ago.

Has anything been replaced yet? How long does it take for code to come back? Thanks.

Customer: replied 11 months ago.
it doesnt go away it remains in the ECM
Expert:  Dan replied 11 months ago.

This code is actually related to the throttle body, not the pedal. The throttle body has two throttle position sensors built into it and if one stops working it sets this code. You can inspect throttle body connector and clean out throttle body with cleaner before replacing. If cleaning doesn't help and connector looks good replace throttle body assembly. Let me know if you have more questions or if there is anything else I can do to help. Thanks.