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Rock Sam

Rock Sam 8/9/2018

2008 Hummer H3 Base 5 Cyl 3.70L


How do I diagnose P0622 OBD-II Trouble Code OBD-II Trouble Code of my car and what are its causes?

1 Answer

Teddy B

Teddy B 8/9/2018

I suggest you type the Code into Google & read up on reasons,causes,etc.

Type: OBD & your Code,add the type of vehicle, to find more info

There maybe You Tube Videos as well

Your going to have to know your way around OHM's Laws of Electricity
& be well versed in the use of at least a DVOM (Volt Meter)

A wiring diagram is almost a must, in order to probe the
correct wires during testing.

PO622 Generator Field Control Circuit

I'm not sure you can diagnose that yourself & just replacing the Alternator,may not
be the problem.


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