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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
23,891 Posts
Welcome to Allpar. I would avoid swapping junkyard PCM's or BCM's between vehicles of this era unless you are sure that the other vehicle does not have the factory VTSS if yours doesn't have the VTSS option.
The VTSS 'seed' will be transferred from an infected PCM to your BCM and once learned it cannot be unlearned. Like a virus, the only fix would be to then replace both the PCM and BCM with good known non-VTSS modules. Reman modules aren't 100% infallible from faults, but may be your best option here and do come with a warranty.
The P0601 code is an internal checksum error, but powers, grounds and bus circuits must be secure. If P0601 comes back a 2nd time after erasing, you can be pretty sure that it is real.
Two PCM's in a row with the same P0601 code is very unusual. I would take a close look at the car-side wiring harness. If it all looks good, return your reman PCM for exchange under warranty. The auto parts store shouldn't have a problem with that.
There may be other problems, but get rid of P0601 first.
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