P0340: No CAM signal at Pcm

Tiny
MALLYBOY
  • MEMBER
  • 2006 DODGE GRAND CARAVAN
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 213,456 MILES
This vehicle started this before I purchase it. I have recheck the timing over and over again but it is was correct. I change Pcm and immobilizer programmed, the code keep coming back.
I replace cam sensor, it didn't solve it. How do I trace the signal circuit of the camshaft sensor to know if it's open or shorted power or ground?
Thursday, November 6th, 2025 AT 12:03 PM

13 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,601 POSTS
So does the engine crank over and not run or does it not crank over? We need more information to help you. Please let us know the code number as well. Here are two videos to help us get started in the meantime.

Not cranking video

https://www.youtube.com/watch?v=6YRW8fyNudY&t

Not starting video.

https://www.youtube.com/watch?v=lXLJbuAZ4CE&t

Please upload an image or short videos in your response of the problem, so we can see what's going on.
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Sunday, November 9th, 2025 AT 10:08 AM
Tiny
MALLYBOY
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The vehicle cranks,
The vehicle starts. But it does not raise above 2500 rpm. When you diagonize it will indicate P0340: NO CAMSHAFT SENSOR SIGNAL AT PCM. On the signal circuit of the cam sensor, there was 4.91volts present. I bypass the circuit from PCM connector C2-34 to camshaft sensor connector terminal-1, the 5volts still exist. I replace the PCM, the 5volts still exist. Then I go to another car of the same model and I measured the signal circuit with igntion on; engine not running, it reads 40Mv, then I start it and it reads 0.4volts at idling.
So I don't know where the circuit is bridging causing the camshaft sensor no signal. So need help on how to trace the particular circuit causing this problem?
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Monday, November 10th, 2025 AT 3:01 AM
Tiny
KEN L
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I need to tell you if the timing chain has jumped it will cause this problem, if the engine is okay this code will not make it not rev FYI. I would do a compression test first which is it is low will help tell us the timing chain is to blame. Here is the guide to help

https://www.2carpros.com/articles/how-to-test-engine-compression

If you want to do the wiring test then trace the wiring colors from the sensor to the PCM and use this guide to do the testing

https://www.2carpros.com/articles/how-to-check-wiring

Please a short video in your response of the problem, so we can see what's going on.
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Monday, November 10th, 2025 AT 9:29 AM
Tiny
MALLYBOY
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  • 338 POSTS
This is not COMPRESSION ISSUE, if it is COMPRESSION ISSUE the vehicle will not be starting at all.

If the engine is okay this code will not make it not rev FYI;
I want to ask you:
how many volts or millivolts does the camshaft sensor return to the PCM on the signal circuit?
Do your test and reply me soon.
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Thursday, November 13th, 2025 AT 1:10 AM
Tiny
KEN L
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The cam sensor on this engine is a Hall-effect sensor, NOT a variable-reluctance (AC) type. So the signal is not a sweeping AC voltage - it’s a digital ON/OFF (square-wave) pattern sent back to the PCM. If you want to test the wiring here is the wiring diagram and I will email it to you as well.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the images (below). Let us know how it goes
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Thursday, November 13th, 2025 AT 10:44 AM
Tiny
MALLYBOY
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  • 338 POSTS
I have check the camshaft sensor wiring and it is not short at any point, the wiring was ok, Then I notice from the daydream that Map sensor was reading 0.00G/ms instead of 4.57G/me. Can you please send the diagram for manifold absolute pressure sensor for me to check it for short voltage or power?
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Thursday, November 27th, 2025 AT 11:04 AM
Tiny
KEN L
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  • 54,601 POSTS
Instead you have a better chance the camshaft is broken or the timing chain is broken, I would do a compression test first, this video can show you.

https://www.youtube.com/watch?v=KOxIm1F8AW0

Please go over this guide and get back to us.
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Friday, November 28th, 2025 AT 6:02 PM
Tiny
MALLYBOY
  • MEMBER
  • 338 POSTS
Good day!
Please show me the difference between 3.3 engine camshaft sprocket and 3.8camshaft sprocket using picture before it would be they interchange it with 3.3 camshaft sprocket instead of 3.8 camshaft sprocket thereby causing this problem. Look at these pictures and tell me which one is 3.3 and 3.8, thanks
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Monday, December 8th, 2025 AT 1:26 PM
Tiny
KEN L
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It looks like they are two different manufactures. I would count the number of teeth and if they are the same run it. So did you find broken chain guides?
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Tuesday, December 9th, 2025 AT 10:47 AM
Tiny
MALLYBOY
  • MEMBER
  • 338 POSTS
Thank you so far
So did you find broken chain guides? There's no broken chain.
I have come to tell you that I have solved the problem. The sprocket are not same. I replace the sprocket and it gone.
For further vehicle challenges or problem email @ mallyboy64@yahoo. Com
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Thursday, December 11th, 2025 AT 8:29 PM
Tiny
KEN L
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Nice work, so to be clear the wrong timing chain sprockets were installed and now the correct ones are on and the noise is gone?
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Friday, December 12th, 2025 AT 8:29 AM
Tiny
MALLYBOY
  • MEMBER
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Nice work, so to be clear the wrong timing chain sprockets were installed and now the correct ones are on and noise gone. Not Noise but Rpm not rising above 2500rpm and CAM SYNC STATE that is showing OUT OF SYNC from LIVE DATA changes to IN SYNC and Rpm rises above 4500rpm after the sprocket change
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Saturday, December 13th, 2025 AT 4:53 PM
Tiny
KEN L
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Hmm, this can be because of a worn out timing chain, did you replace it with a new one?
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Monday, December 15th, 2025 AT 10:38 AM

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