P0340 code

[Brando78]

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

[the roadie]

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.

[Brando78]

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.

[Brando78]

Thanks, Roadie. Changed out sensor and engine code is gone and my cruise works again.

[Bear Attack]

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.

[Black04 SLT]

Originally Posted by the roadie

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.

Originally Posted by Brando78

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.

Originally Posted by Brando78

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

[Bear Attack]

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.

[infinity5]

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.

[M165766]

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).