All 4 camshaft sensor codes p0340 p0349 p0369 p0394

Adam Lee

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I have a 2012 Mustang GT with a procharger on it. The tune is from Lund racing. The car has 29000 miles on it. I'm having a problem with these four codes popping up and I'm not as powerful with the engine light on. Stock cams. If I am getting off work hard at the same time now, doesn't that mean something major is wrong?

Screenshot_20211011-190955_ScanMaster.jpg
 

Juice

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Since those are intermittent AND on all 4 cams, I suspect an electrical issue common to those sensors.
 

Juice

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Well, with any electrical system issue, its never a bad idea to check charging system/battery first. Unstable or low system voltage will cause wierd issues.
 

Adam Lee

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Ok i went out with volt meter. Battery is a duralast gold made on 12/2019. It has 12.5v before start up. That was normal i thought. When i started it i had 14.6v so alternator is working. I did notice when i was cranking it over to start the engine that the voltage went down as far as 10.5v on the battery. Should a battery dip that low when cranking the engine? I checked all 4 cam sensor pigtails and wiring , nothing looks burnt, melted, or chewed. Im at a loss
 
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Juice

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Ok i went out with volt meter. Battery is a duralast gold made on 12/2019. It has 12.5v before start up. That was normal i thought. When i started it i had 14.6v so alternator is working. I did notice when i was cranking it over to start the engine that the voltage went down as far as 10.5v on the battery. Should a battery dip that low when cranking the engine? I checked all 4 cam sensor pigtails and wiring , nothing looks burnt, melted, or chewed. Im at a loss
Voltage is good.
Time to break out the shop manual and follow the checklist to troubleshoot those codes.
 

bigbug11

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Replace your original factory alternator. All your dead battery problems and cam codes will disappear.
 

crjackson

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I had the same exact issue. It was the CRANKSHAFT Position Sensor harness connector at the back of the block. It got damaged either during a clutch install or header install but it didn’t show up until later, when it was jostled around during the Supercharger was installed.

I couldn’t figure it out, but a tech at my local for dealership ship nailed it down is less than 10 min. It took another 15 min. to repair. He snipped off the old connector (after showing me the photo) and replaced it with a new pigtail. All has been good since then. That was about a year ago I think.

He told me the first thing to check on a Coyote engine throwing cam sensor errors, is the crank sensor circuit.

I went through the whole rigmarole of checking battery / alternator / AC ripple etc … as well.

Anyway, something else for you to check.
 

Adam Lee

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Oh thank you. Now i just have to find where the crank sensor is. Behind the motor i assume lol
 

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