
Chrysler PCM horror stories and simple solution
Over the years I have read enough horror stories about
Chrysler PCM (old style no CAN vehicles). Like swapping it
from another car for testing purposes and now the donor has
not start condition. It happened because of VTSS system.
This system is optional and could be turned on by DRBIII but
could not turn off once enabled. Option is sitting in a body
computer and it could be evoke only from there. There is not
such option in PCM. It will acquire this option once and
forever the second it sees VTSS message on communication
network (CCD or PCI bus). So the only way to make such PCM
working on non-VTSS vehicle is to make it on in body
computer. Sometime it is not even possible because Chrysler
has low tech BCMs without this option. More often a hardware
(like door switches) not installed on particular vehicle. So
you can turn it on but in case this system goes off owner
will have a hard time to disarm it and start the car. VTSS
system has nothing to do with SKIM or SKREEM and not VIN
related, so any PCM from VTSS vehicle will start another
VTSS vehicle without any additional procedures if SKIM
module not installed. Vladimir from New York ![]()
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