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P2135, P0135,P0121,P0242,P004

David Northern

By David Northern
in Ask A GM Technician

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David Northern New Member

David Northern

Posted
Posted

I have a 2011 GMC Sierra 5.3l Flex fuel.  I recently filled up my gas tank at a gas station I don't like but had to.  Since then I've been getting a P2135 along with P0135,P0121,P0242,P004.  I think the other ones are related to the throttle body one and it running so bad when the reduce power mode and stability track turned off occur.  It has been below zero this entire week and I don't know if that's playing a part in it or not.  I removed and cleaned the throttle body but this didn't help.  Any suggestions before I just start replacing parts?

Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted

That last code is missing a digit.

 

2 of the codes are throttle body related (one is TPS, probably set because the throttle body is dirty), and one is a o2 sensor code for the heater circuit.

 

Could just be a bad o2 sensor causing that heater code (passenger side, btw), but you'll want to test the 2 wires that are NOT the same color (IF I'M NOT MISTAKEN - TEST FIRST AND SEE) and see if they are sending power and ground to the heater - it's pulse width modulated, so you won't see a full 12v on it. Your meter will average the on/off voltage.

 

The other 2 codes related to the TPS and throttle body are probably from a dirty throttle body. Now, I've heard some of these can't be cleaned - you'll have to look that up (wouldn't shock me if GM engineered something like this), but if you do clean it, it's going to idle at 3k until you perform an idle relearn procedure with a bi-directional scan tool. Memory is fuzzy ... but I recall some newer vehicle having a throttle body that was damaged if you opened it manually for cleaning - can't recall the make or model that vehicle was, so just search the net - it's been out long enough that this info should be out there.

 

When it's clean, you could try disconnecting the battery for a half hour, then touching the positive and negative CABLES together for a few seconds, before hooking them back up to the battery. This MIGHT relearn the idle ... but it might not. Some of these can be a pain in the ass to relearn. The Impala is one that sticks in my mind, but I think you should be all set with the truck. Most are fairly easy, but my experience ends with 2010 models.

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

What Jsdirt said, plus.... 

 

Information on trouble codes is far easier to find these days.  Used to be all you could find was the cryptic programmers error message that only made sense to the team that wrote the code.  Now you can find complete diagnostic procedures fairly easily.  Take a look at www.obd-codes.com for suggested procedures.  

You sure about seeing P0242 code?  You will want to be careful with entering trouble codes correctly, transposing numbers can send you way off course, both time and money wise. 

And finally, please post your results so we all can learn. 

 

tbarn Senior Enthusiast

tbarn

Posted
Posted

P004 and P242 do not exist.  Check for a campaign for the throttle body codes. 10 years, 120k miles. Special policy 11273B. Must show when the dealer runs the vin.

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