Alternator or cam sensors?

2012 FORD F-150
123,000 MILES • 5.0L • V8 • 4WD • AUTOMATIC
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DR. AUTO ADLER
Hello, Ken.
I have that 2012 f150 that you helped me with that I put the 2017 5.0l in and put the 2012 camshafts in it. You helped me get the timing correctly.
Now il getting a P0625 and ( that's the code that will not clear), then when running it comes up with misfires and P0340 and P03440. Battery seems fine. Where is F circuit on the alternator and does the alternator really affect the cam sensors and timing that drastically to misfire 2,3,4,7,8. Thanks again..
Aug 21, 2025 at 2:39 PM
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STRAILER
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
It looks like the alternator might not be charging, I would start the engine and use a voltmeter to check the output. This guide can help:

https://www.2carpros.com/articles/how-to-check-a-car-alternator

P0625 - Generator Field-F Terminal Circuit Low
P0340 - Camshaft Position Sensor Circuit (Bank 1, Sensor A)
P0344 - Camshaft Position Sensor Circuit Intermittent (Bank 1, Sensor A)

The bad news in this camshaft codes come up if the timing chains are off a tooth. It is difficult to get the mark correct on these engines. :/
Aug 22, 2025 at 8:51 AM
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