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2014 Silverado LTZ Z71 Code P0121

1057

By 1057
in Troubleshooting & Recalls

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1057 Enthusiast

1057

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So my 2014 Silverado LTZ Z71 with 5.3 engine threw a code P0121 yesterday.  The dreaded TPS..  Don’t know if this helps but I do a LOT of idling for work.  

 

Anyways, finally found my scanner when I found the TPS code.  Started the truck this morning and the code is now gone.  Put the scanner back on it and TPS is giving me a reading of 20.4% while idling. I cleared the code, and I know it most likely will return.  Plan on cleaning the Throttle body for the first time when I wake up this afternoon. 

 

What is is the normal idling range for the TPS? Anything other to look at and or watch?  I only run OEM parts on my truck, so is it possible to only replace the TPS sensor if necessary or will I have to replace the entire throttle body? 

 

Any other tips or advice is welcomed! 

 

Thanks!

EDE38F31-F3E8-4895-84E1-17A4B411BBBE.png

1057 Enthusiast

1057

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Posted

Ok gave the throttle body a good cleaning, and started the truck and let it run for about 3 minutes.  

 

So so far the rough idle seems to have dissipated, and the TPS sensor is running at 20.4% to the occasional 20.8%, where it was staying at 20.4%.  And RPM’s are staying around 540-550rpms. 

 

Think the real test will be this afternoon when I go to work were I do most of my idling. 

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