codes 1016 and P1635

[kappers]

1016<-- means loss of communication with the pcm P1635<-- 5 volt reference circuit # 1 Where does a guy start on both of these codes?

[tblu92]

If the engine seems to be running fine--those are both very uncommon codes I would clear them and not worry unless they come back--

[kappers]

Yeah I should have posted that it will not start

[luvmy98c5]

Hay kappers, i'm getting the same 2 codes on my 98. Were you able to resolve your issue? After i clear my codes they come back after i drive for a little bit. I have also noticed my volt meter on the dash drops to about 11 or 12 volts when i stop the car, then goes back up to about 14. I tried swapping the alternator but that didn't help. Are you experiencing anything similar to this?

[JonLT4CE]

Originally Posted by kappers

1016<-- means loss of communication with the pcm
P1635<-- 5 volt reference circuit # 1

Where does a guy start on both of these codes?

DId you ever find the P1635 code?

Thanks,
Jon