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P0446 Code and Remote Start 2017 Sierra

4weight

By 4weight
in Troubleshooting & Recalls

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4weight Enthusiast

4weight

Posted
Posted

Don't think these are related but overnight, I got the P0446 Evap system code and now my remote start will not work.  Any reason the RS would not work based on this code?  I think not but if not, any thoughts on why remote start is not working.  Truck is in warranty and taking to dealer on Monday.

 

Thanks,

 

4W

tbarn Senior Enthusiast

tbarn

Posted
Posted

Remote start stops with almost all ecm codes and some other codes.

4weight Enthusiast

4weight

Posted
  • Author
Posted

Thanks Tbarn, that was kind of my suspicion, your reply confirms it. 

JimCost2014 Senior Enthusiast

JimCost2014

Posted
Posted
10 hours ago, 4weight said:

Don't think these are related but overnight, I got the P0446 Evap system code and now my remote start will not work.  Any reason the RS would not work based on this code?  I think not but if not, any thoughts on why remote start is not working.  Truck is in warranty and taking to dealer on Monday.

 

Thanks,

 

4W

Any code equals no remote start. It is GM's foolproof way to alert you that there is a problem with your truck. Actually a safety feature.

4weight Enthusiast

4weight

Posted
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Posted

Thanks Jim, based on feedback kinda figured that,  Happy new year bud!

JimCost2014 Senior Enthusiast

JimCost2014

Posted
Posted
6 minutes ago, 4weight said:

Thanks Jim, based on feedback kinda figured that,  Happy new year bud!

Happy New Year to you too!!! Good luck on the code.....

4weight Enthusiast

4weight

Posted
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Posted

Thought I’d post kind of interesting.  Never really got on this truck since I got week after Thanksgiving.  Was out on a hunt and thought I would see what it would do.  Hit the gas got to about 80-85 and throttled down.  Kind of just drove on down the road and lo and behold, the check engine light went off. Has been off since.  Remote start works.  Guess I fixed the code.  Canceling my service call in the am since they can’t do any diagnostics now.  

 

When end all else fails, just haul ass!!  

JimCost2014 Senior Enthusiast

JimCost2014

Posted
Posted
4 hours ago, 4weight said:

Thought I’d post kind of interesting.  Never really got on this truck since I got week after Thanksgiving.  Was out on a hunt and thought I would see what it would do.  Hit the gas got to about 80-85 and throttled down.  Kind of just drove on down the road and lo and behold, the check engine light went off. Has been off since.  Remote start works.  Guess I fixed the code.  Canceling my service call in the am since they can’t do any diagnostics now.  

 

When end all else fails, just haul ass!!  

 I know that in past that codes would reset after 8 ingnition cycles if it was not a problem. Just do not think anything to do with emissions will just go away unfortunately. 

4weight Enthusiast

4weight

Posted
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That is my thought too Jim, but not much I can do when it is not coding for the dealer to read.  So I am moving on for the time being.

4weight Enthusiast

4weight

Posted
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Interesting.  Thanks for that info, I will reschedule and take it in.  

4weight Enthusiast

4weight

Posted
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5 hours ago, txab said:

Codes are stored

Went and met my service advisor today.  Indeed the codes are stored in the memory but they cannot duplicate the readings unless the code is active with check engine light on.  He said there are various reasons this code showed up.  There could indeed be an issue or even a battery power modulation issue where the code got tripped accidentally.  The truck has 30-35 computers working at the same time and he is seeing this more and more where the battery is modulating power to different sources and can hiccup.  Nice guy and will keep info here if the code reappears. 

JimCost2014 Senior Enthusiast

JimCost2014

Posted
Posted
44 minutes ago, 4weight said:

Went and met my service advisor today.  Indeed the codes are stored in the memory but they cannot duplicate the readings unless the code is active with check engine light on.  He said there are various reasons this code showed up.  There could indeed be an issue or even a battery power modulation issue where the code got tripped accidentally.  The truck has 30-35 computers working at the same time and he is seeing this more and more where the battery is modulating power to different sources and can hiccup.  Nice guy and will keep info here if the code reappears. 

The factory batteries are pretty bad as far as life span. Just push to see if they will replace it. When they are getting weak you will have all sorts of electrical glitches.

4weight Enthusiast

4weight

Posted
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1 hour ago, JimCost2014 said:

The factory batteries are pretty bad as far as life span. Just push to see if they will replace it. When they are getting weak you will have all sorts of electrical glitches.

Interesting you say that.  Asked him about battery life span and he told me it’s all over the board.  Some go 100K some are dead off the transport truck.  I’ve always been an Interstate guy what are your thoughts.

tbarn Senior Enthusiast

tbarn

Posted
Posted

Battery issues cause lots of communication and voltage codes but not p0446.

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