P0340 CODE

[07hoeCHEVY]

Has anyone encounter this code I have a 07 tahoe 4.8

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[wjburken]

Has anyone encounter this code I have a 07 tahoe 4.8

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Camshaft position sensor circuit?

I’ve read of various folks here having it.
There are a variety of reasons that you could have this code.

How many miles do you have on the vehicle?

Any recent work done on it?

Could just be a bad sensor or something more serious.

 

[OR VietVet]

This part may be in your future: https://www.rockauto.com/en/moreinfo.php?pk=993793&cc=1433503&jsn=2228

If you do that I would do the crank sensor at the same time: https://www.rockauto.com/en/moreinfo.php?pk=947445&cc=1433503&jsn=2239

As Wade said, any recent work? Experiencing any driveability or starting problems? Did the code just now show or has it been on for a while?

 

[07hoeCHEVY]

Camshaft position sensor circuit?

I’ve read of various folks here having it.
There are a variety of reasons that you could have this code.

How many miles do you have on the vehicle?

Any recent work done on it?

Could just be a bad sensor or something more serious.

200+ miles just did front struts an rear shocks that is all

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[07hoeCHEVY]

200+ miles just did front struts an rear shocks that is all

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Gona try replacing the sensor it behind the starter correct.. ??? Not the one behind the harmonic balancer

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[wjburken]

200+ miles just did front struts an rear shocks that is all

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Well, if you have a good scan tool, like a Tech2, I would think you can see if the sensor is just not putting out the proper voltage or if the sensor is telling you you have bigger issues. At 200K+, you could have a timing chain that is stretched. I am not familiar with what the 4.8 has for a timing chain tensioner. I have also seen where the sensor gets messed up due to metal filings collecting on it and messing it up.

Is that the only code you have? Are you by chance getting a crankshaft position code as well?

 

[wjburken]

Gona try replacing the sensor it behind the starter correct.. ??? Not the one behind the harmonic balancer

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The sensor should be on the timing cover down by the crank pulley.

 

[OR VietVet]

Well, if you have a good scan tool, like a Tech2, I would think you can see if the sensor is just not putting out the proper voltage or if the sensor is telling you you have bigger issues. At 200K+, you could have a timing chain that is stretched. I am not familiar with what the 4.8 has for a timing chain tensioner. I have also seen where the sensor gets messed up due to metal filings collecting on it and messing it up.

Is that the only code you have? Are you by chance getting a crankshaft position code as well?

According to RA there is this tensioner in there. https://www.rockauto.com/en/moreinfo.php?pk=3478017&cc=1433503&jsn=2305