Question about 2005 Chrysler Pacifica

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Pcm Anti theft on and the battery is draining.. Dealer says pcm but im not so sure.. They want $1350?

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A mechanic would pull the fuses to find the drain.
You could disconnect the computer and check it, but it provides a ground to a large number of sensors and relays so it could still be tough to find the fault.

Posted on Jan 11, 2013

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Posted on Jan 02, 2017

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How do I reset anti theft on2000 ford explorer


The passive vehicle protection system will be activated and will disable the vehicle from starting if there is a:
  • damaged encoded key.
  • unprogrammed key.
  • non-encoded key (key has no electronics).
  • wiring concern.
  • transceiver concern.
  • PCM concern.
  • module communications network concern.
Reset ? IF your anti-theft system light is flashing when trying to start your vehicle , an the engine doesn't crank , turn , or nothing happens when you turn key , then your anti theft system is at fault ! An trying to reset will not work ,you need to have it checked DTC'S - diagnostic trouble codes ,then fixed ! I suggest you have it towed to the dealer or a ASE certified repair shop !
PATS uses the powertrain control module (PCM) to enable or disable the engine. The PATS module communicates with the PCM over the SCP communication network in order to enable engine operation. The PATS module and the PCM use sophisticated messages in order to prevent a theft. The PATS and the PCM share security data when first installed together, making them a matched pair. After this security data sharing, these modules will not function in other vehicles. The PCM shared security ID is remembered even if the battery is disconnected. The PATS module also stores the vehicle's key identification code, even if the battery is disconnected. There are special diagnostic repair procedures outlined in this workshop manual that may be carried out if either the PATS module or the PCM needs replacement.

Jan 20, 2016 | Ford Cars & Trucks

1 Answer

Im almost sure that my anti theft system is stopping my 1998 chevycaviler z24 from starting do i need to take it to a gm dealer


If it were my car I would definitely take it to a GM Chevy dealer to have it checked out.

If the anti theft system has kicked in to stop the car being started you might find a security warning light on the dash.

Dec 26, 2015 | Cars & Trucks

1 Answer

Vehicle will not start! Replaced the battery but it will still not turn over. Oil light, battery and engine light come on when initially trying to start.


Is the security light on or flashing when trying to start the vehicle .
Anti-Theft The passive anti-theft system (PATS) consists of the following components:
  • Anti-theft indicator
  • Encoded ignition key(s) (the key contains a transponder)
  • PATS transceiver
  • Powertrain control module (PCM)
PATS will disable the vehicle from starting if there is:
  • a damaged PATS key.
  • an unprogrammed PATS key.
  • a non-encoded key (a conventional key or one that does not have any electronics).
  • damaged wiring.
  • a damaged transceiver.
  • a damaged PCM.
If it is a anti-theft system you will have to take it to the dealer .This system will keep the starter from spinning the engine .

Oct 30, 2015 | 2007 Ford Freestyle

2 Answers

I need to know how to do a relearning process for the PCM to communicate the TDS on my 1998 Cadillac DeVille I recently replaced the computer and it won't start! I plugged my scanner to it and it only...


The last time I looked, the PCM has to be programmed by a dealer or authorized shop for the vehicle VIN number (the anti-theft and radio systems will already be programmed to only accept this number). If it is, then the anti-theft system has to be reset, also usually by a dealer with a programmer.

Mar 31, 2015 | 1998 Cadillac DeVille

2 Answers

Car cranks but wont start after sitting 3 months


Sometimes if it set too long the gas went bad. You may have to drain the gas and the put fresh gas in.

Mar 01, 2014 | Ford Taurus Cars & Trucks

1 Answer

2003 Saturn Vue with a identity anti theft system. Replaced my battery a few months ago. Couple weeks ago noticed a little difficulty starting up. Last week wouldn't start just clicking noise. Jumped...


Anti-theft system has nothing to do with it . Battery cables , maybe , Park neutral safety switch possibly ! With anti-theft system problem you wouldn't a click or anything , that is if the anti-theft disables fuel or the starter . Plus the SECURITY light would be on if it were a anti-theft system problem . Your best bet , take it to a qualified repair shop that knows how to do starter circuit testing >
Starter Voltage Drop
How to voltage drop test starter motor circuit

And what's this identity anti theft system ? No such thing ! The vehicle has a content theft an vehicle theft deterrent system !
This system disables fuel not cranking of the engine. The VCM/PCM will not disable the fuel due to any BCM message for the remainder of the ignition cycle.
If the VCM/PCM does not receive the same password from the BCM as the last learned one, the vehicle will start and then stalls due to the Fuel Lockout.

May 17, 2017 | Cars & Trucks

2 Answers

I hve a 2002 f150. i let my battery die. and when on a charger over night it will start and when not it wont. when not on a charger the anti theft light blinks more than normal. is it my battery or the...


it does sound like your battery is the problem but have a local shop test it and the charging system and the anti theft system connections maybe the alarm is draining the battery with a poor connection..

Feb 23, 2012 | 2002 Ford F150 Regular Cab

1 Answer

My battery had to be recharged on my 1994, BMW 318... My anti-theft system and radio are not working now as a result, but worked fine before the battery was recharged... There is a CODE msg in the...


When you take the battery cables loose from an anti-theft system, You would place a nine volt (9V) battery across the positive and negative cables to hold the memory chip in the systems. This allows you to remove the battery for a period of time longer than a few minutes. The system (anti-theft) is designed with a couple of capacitors in the system that hold the charge for a few minutes to allow changing of the battery. If the battery is removed for much longer than 30 minutes then the capacitors drain and the memory is lost in the chips.

You are going to have to go to the BMW dealer and have them re-write your system, and it will cost you about a hundred bucks. They have the plug in device that will restore the system and it is not sold to the general public. That is why it is called ant-theft, so if someone steals your radio it quits working.

Nov 30, 2010 | 1994 BMW 3 Series

1 Answer

When jump starting my 99 jeep GC I accidentally hit the negative post with a pos cable (hot) large spark and subsequently it would crank but not start. Sentry key light came on steady as did check engine....


Not sure, but if Sentry Light stay on, by shorting it, the anti-theft system stay on ! Unplug the battery for 30min's reconnect it, and try it again, alot of chance that the anti-theft system will reprogram and will function normally ! You can go to a Local Dealer with your Jeep they will reprogram the system and everything will be fine ! For the Check Engine, need a OBD2 Code Scanner or a Garage/Dealer Scanner to know the Code Stored in the PCM and it will tell if PCM is okay too !

Aug 10, 2010 | 1999 Jeep Grand Cherokee

2 Answers

How do you reset a anti-theft system on a 1998 jeep grand cherokee limited 5.2 v8.


You can pull the battery for 10 mins and it should reset the entire ECU PCM and Anti Theft system

Sep 01, 2009 | 1998 Jeep Cherokee

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