Cadillac Seville / Cadillac Eldorado Forum Discussion, 96 Seville Theft Deterrent Problem in Past Cadillac Vehicle Discussion; After car wouldn't start because of bad battery one night, replaced battery, but all it will do is crank - ...
After car wouldn't start because of bad battery one night, replaced battery, but all it will do is crank - not start.
The DIC shows Theft Deterrent message. Had car towed to a local Chevy dealer (the Cadillac dealer was booked for the
whole next week). They determined (incorrectly) that the problem was the ignition lock cylinder. Actually it was bad,
but had already done the VATS bypass. They changed the lock cylinder and keys, and supposedly reprogrammed it, but
still won't start. Before, the code was a P1631. Now when I check codes, there are several: IP1552, PC1631, PC1632, IP2750, and an SD1026. But the thing is, all are history - no current codes. I've installed the Newrockies Pro module to bypass this system, but that hasn't worked either. Neither has doing the 10/10/10 relearn procedure. Is it
now just a matter of changing parts (PCM or IPC) and trying again? Really can't afford hours and hours of dealer diag time plus parts right now...
Sounds very much like the situation I had. Theft deterent message, Had fuel pressure, Starter would spin the engine but no start, no codes. Turned out to be a ground wire off at the passenger end of the transmission.
Originally Posted by fmw63
They did check fuel pressure, was ok. "starting disabled" theft deterrent message still there, but no current codes
Automobile(s): 2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
East Boston MA.
What kind of "bypass" is this Newrockies thing? If VATS is fully disabled, the message shouldn't display. And if it does display, the starter and fuel pump shouldn't be working. If someone played with the VATS system, other electrical issues could be causing the no start condition.
checked cables again. seemed ok there. battery needed a jump - was getting run down. left it charging while checking for codes and doing relearn procedure again. Now getting some current codes finally: IP2750 PASS-KEY II Data Communication Failure and a PZ1558 BCM EPROM Checksum Error.