P0340 code - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 02-21-2010, 01:49 PM
Brando78 Brando78 is offline
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2003 GMC Envoy SLE XL
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Location: Calgary, AB
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P0340 code

Hi, guys. This website is great and would like to thank all you guys with your helpful info. I have a '03 Envoy with the 4.2L and I keep getting Po340 camshaft position sensor A Circuit(Bank 1 or single semsor circuit malfunction). What do I have to do to fix this? Also cleaned my throttle body and ever since my cruise doesn't work. Checked connections and fuses all seem good. Hope I don't have replace throttle body. Thanks
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  #2  
Old 02-21-2010, 02:46 PM
the roadie's Avatar
the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
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I would certainly throw a $20 cam position sensor at the problem. I just posted pics on how I changed mine. 10mm socket and that's it.

http://forums.trailvoy.com/showthread.php?t=70014

Having a SES light and a code like that will suppress the cruise control. GM designed that as an annoyance factor to make sure you're motivated to fix the SES code.

If the throttle body was messed up to the point that you needed to replace it, it would throw other codes AND put you into Reduced Engine Power mode and you'd barely be able to limp home.

I gotta ask: The exact code is P0340, not Po340 (I'll edit your title to help future searchers.) Did you search for either of these terms? "P0340" comes up in 38 threads.
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  #3  
Old 02-22-2010, 09:31 AM
Brando78 Brando78 is offline
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Thanks for the pic on the sensor. It looks very simple to change out. I will be changing it out later today and hopefully my cruise will work again. I put an "O" instead of a zero in my search and thats why I did not get all the posts. Will remember that with the next trouble code.
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  #4  
Old 02-23-2010, 03:37 PM
Brando78 Brando78 is offline
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problem fixed!

Thanks, Roadie. Changed out sensor and engine code is gone and my cruise works again.
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  #5  
Old 07-09-2010, 02:55 PM
Bear Attack Bear Attack is offline
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2002 GMC Envoy SLT
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I just got my oil changed and this code popped up.



I went to this link
http://forums.trailvoy.com/showthread.php?t=70014

It appears the sensor is easy to see, but my when I looked on my 02 Envoy that sensor is not there.
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  #6  
Old 07-09-2010, 03:08 PM
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Black04 SLT Black04 SLT is offline
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Quote:
Originally Posted by the roadie View Post
I would certainly throw a $20 cam position sensor at the problem. I just posted pics on how I changed mine. 10mm socket and that's it.

http://forums.trailvoy.com/showthread.php?t=70014

Having a SES light and a code like that will suppress the cruise control. GM designed that as an annoyance factor to make sure you're motivated to fix the SES code.

If the throttle body was messed up to the point that you needed to replace it, it would throw other codes AND put you into Reduced Engine Power mode and you'd barely be able to limp home.

I gotta ask: The exact code is P0340, not Po340 (I'll edit your title to help future searchers.) Did you search for either of these terms? "P0340" comes up in 38 threads.
Quote:
Originally Posted by Brando78 View Post
Thanks for the pic on the sensor. It looks very simple to change out. I will be changing it out later today and hopefully my cruise will work again. I put an "O" instead of a zero in my search and thats why I did not get all the posts. Will remember that with the next trouble code.
Quote:
Originally Posted by Brando78 View Post
Thanks, Roadie. Changed out sensor and engine code is gone and my cruise works again.
it is chain of events like these is why this site is so useful..............far less headaches on vehicle repair
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  #7  
Old 07-09-2010, 04:02 PM
Bear Attack Bear Attack is offline
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2002 GMC Envoy SLT
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I was wrong

I was blind in one eye and could not see out of the other.

Repair complete. Cost was 35 plus tax for the part.

Huge Thank You.
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  #8  
Old 09-18-2012, 09:11 PM
infinity5 infinity5 is offline
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2003 GMC Envoy SLT XL
Medium Sage Green Metallic 4.2L I6 2WD
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rough idle and stalls

My Envoy just started the up/down idle and stall upon a stop. My Wife had the CES light come on and I checked the codes and came up with the P0340 code, Camshaft Position Sensor A circuit. I cleared it. Drove around for about an hour and the symptoms got worse. (computer trying to reset?) Is the cure the Camshaft Position Sensor? Saw where the location is on this site. Any help is greatly appreciated.
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  #9  
Old 11-23-2012, 11:27 AM
M165766 M165766 is offline
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2002 Chevy TrailBlazer LTZ
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Cam Sensor replacement

Mine is doing the same. Will try the oil change first; then the sensor. There is a lot of forum discussion in other threads on a CASE Relearn when changing either the sensor or the Exhaust Cam Actuator Solenoid (another problem part associated with the idle/stall issue).
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