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Put new pcm now its stuck in security mode how do I get it off

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You need to also buy the ignition switch alll locks and keyfobs,or you will never start it,call a dealer for info

Posted on Apr 18, 2015

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Pcm was stolen at repair shop. put re-maned one and had it programed to vehicle.now it wont stay running and has a miss. ran like new prior,,had trans replaced


Bought a bad PCM? Wrong one? Just got a PCM, it was for a 3.4 engine. They told the manager it would work for a 3.8. I told the manager it won't. Had to hook it up and prove it to the manager. Security was the first issue, then the transmission would be the next. I didn't even make it pass the security. A 3.4 PCM will run the 3.8 engine, with other computers replaced. But will not run the transmission correctly. And this is our problem. I told the manager to inform the customer that they had the wrong PCM. I also told him to give the car back. Then told him I could fix it, but needed PCM,BCM, Ignition switch,key and chip, from one junk car.

May 28, 2016 | 2005 Cadillac Deville

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What causes I/P lights to blink when put in gear?


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Dec 19, 2015 | 2005 Chrysler 300 Touring

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Why does the anti-theft light stay on?


There is a problem with the system an there is a DTC - diagnostic trouble code stored in the body control module !
The vehicle theft deterrent system is designed in order to prevent vehicle theft by disabling the fuel injectors unless the lock cylinder is engaged by the correct mechanical key. The theft deterrent system uses the following 4 components for theft prevention:
?€¢
The lock cylinder


?€¢
The ignition switch


?€¢
The body control module (BCM)


?€¢
The powertrain control module (PCM)

When starting the engine, the PCM searches for a password from the BCM through the Class 2 serial data circuit. If the password is not recognized or not present, the PCM will disable the fuel injectors. Two modes of tamper detection are provided:
?€¢
No password received


The engine will start and stall quickly. SECURITY telltale will flash on the instrument panel cluster (IPC) and then stay ON steady.


?€¢
Incorrect or disable password received (More than 3 invalid passwords are received)


The engine is disabled for at least 10 minutes and the SECURITY telltale will illuminate solid on the IPC during the 10 minutes.

After the vehicle has passed theft detection, the PCM will continue normal operation
Ignition Switch
The mechanical key and lock cylinder is located on the steering column. The main electrical switching portion of the assembly is separate from the key and lock cylinder. The VTD portion of the ignition switch is the Passlock?"¢ cylinder.
The Passlock?"¢ lock cylinder is a locking cylinder that turns a magnet past a stationary hall effect sensor. When turned to crank, the hall effect sensor is latched which applies a fixed resistance to the Passlock?"¢ signal data circuit. The voltage measured by the BCM on the Passlock?"¢ signal data circuit is the Passlock?"¢ data value.
Body Control Module (BCM)
The BCM compares the Passlock?"¢ data value to a value that it has stored in memory. If the values match the BCM sends a password via the class 2 serial data line to the PCM.
Powertrain Control Module (PCM)
When the PCM receives the correct password, the PCM enables the fuel injection system, allowing the vehicle to operate correctly. The PCM may allow the car to start and quickly stall during a failed theft condition.
If the BCM does not receive a Passlock?"¢ data value, the BCM will enter a short tamper mode. During this mode, the VTD system will not allow the car to operate for 4 seconds.
If the Passlock?"¢ data value is incorrect, the VTD system will enter the long tamper mode. In the long tamper mode, the following actions will occur:
?€¢
The THEFT SYSTEM indicator will flash.


?€¢
The fuel injectors will be shut off for approximately 10 minutes.

Although the vehicle may start, the engine will quickly stall due to a fuel cut-off.
In the event of an open in the serial data communication between the BCM and the PCM or a failure in the Passlock?"¢ lock cylinder, the following actions occur:
?€¢
The VTD system will become fail-enabled if the car has already passed theft for that ignition cycle (i.e. the engine is running).


?€¢
The PCM or the BCM may set diagnostic trouble codes (DTCs).


?€¢
The THEFT SYSTEM indicator will light continuously.


?€¢
The PCM will become fail-enabled for future ignition cycles.

If a failure occurs when the ignition is off, while the VTD system is not fail-enabled, the PCM will never receive a valid password, and will not allow vehicle operation by disabling the fuel injectors. An this system can set 6 DTC'S
DTC B2947 Security System Sensor Power CKT Low DTC B2948 Security System Sensor Power CKT High DTC B2957 Security System Sensor Data Circuit Low DTC B2958 Security System Sensor Data Circuit High DTC B2960 Sec Sys Sensor Data Incorrect but Valid DTC B3031 Security System Controller in Learn Mode DTC B3033 Security System Indicates Tamper

May 21, 2015 | 2000 Chevrolet Cavalier

1 Answer

My security light stays on in my car


If it stays on and the car starts you are in bypass mode.
Some times remote starting alarms have a switch under the console to put a car in this bypass mode.

If not pull the battery for 5 min. and relearn your key.

If still no luck you are me and you got a code in a BCM or PCM.

Just from changing a battery.....Love GM....well in the 60s maybe

May 13, 2010 | Cars & Trucks

1 Answer

I need to remove and replace the Radio in 2003 mitsubishi eclipse


I WOULD LET THE DEALERSHIP REPLACE RADIO BECAUSE BY IT BEING PART OF THEFT SECURITY SYSTEM.IF YOU DO IT YOUR SELF YOU PROBABLY GOING TO HAVE NO START PROBLEMS.THE PCM WILL GO IN THEFT MODE THINKING SOMEBODY TRYING TO STEAL RADIO OR CAR.IF DEALERSHIP FIX THEY PUT IN NEW RADIO THEN REPROGRAM IT.

Mar 31, 2010 | 2003 Mitsubishi Eclipse Coupe

1 Answer

My gearbox is stuck in 2nd gear even if you put it into 3 or L & engine light is stuck on & cant remove it?


the pcm prolly has picked up a problem with the transaxle, pcm puts the transaxle in "limp mode" which will keep it n 2nd or 3rd depending on the programing try checking the codes to see if it has speed sensor or solonoid failure codes. clear them, n c how long it takes to come back

Mar 20, 2010 | 2004 Chrysler Voyager

1 Answer

The security light comes on after u turn the car off for 10 mins and then try to start it is there any ways to fix it of turn the security light off


MOST OF THE TIME YOUR BCM GOES BAD OR THE KEYS ARE WORN UNTIL THE BCM AND PCM DONT RECOGNIZE THEM CAUSING CAR TO GO IN SECURITY THEFT MODE.SO THE KEYS AND IGNITION SWITCH AND BCM HAS TO BE REPLACED AND REPROGRAM.THIS IS DEALERSHIP FIX.BECAUSE THEY HAVE TO USE A SCANNER TO REPROGRAM NEW KEYS AND IGNITION SWITCH TO THE BCM AND PCM SO CAR WILL START.

Feb 20, 2010 | 1999 Oldsmobile Alero

1 Answer

1999 Oldsmobile Alero radio replace


IF YOU CHANGE RADIO.BY IT BEING PROGRAM TO PCM.YOU PROBABLY GOING TO HAVE STARTING PROBLEMS.THE THEFT MODE KICK IN.PCM WILL NOT RECOGNIZE NEW RADIO.THE PCM WILL NOT LET CAR CRANK.IT THINKS IT THEFT.

Aug 01, 2009 | 1999 Oldsmobile Alero

3 Answers

PUT IN NEW STEREO NOW CAR WON'T START & SECURITY LIGHT IS ON


the radio that come with car is program to pcm .if remove or put in another radio. pcm security mode kick in.it dont recognize radio it think theft so it disable car ignition so you cant start.if you get a radio the dealership has to put them in and program it.

May 31, 2009 | 2001 Chevrolet Venture

1 Answer

When I replaced the stereo in my daughter's car I lost power to the Ignition. I still have dash lights. But no power at the stereo and the car will not turn over. Also the keyless entry stoped working. How...


car stereo that come with car is program to car pcm security system.when you change stereo.the pcm dont recognize the new stereo.the pcm goes into anti theft mode it disable ignition.system.

May 17, 2009 | 1999 Saturn SL

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