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P1631 theft system problem - 2004 GMC Sierra

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Have your charging system checked,alternator,relay and necessary things

Posted on Aug 15, 2014

  • Kehinde Yusuf
    Kehinde Yusuf Aug 15, 2014

    have your charging system checked

  • Kehinde Yusuf
    Kehinde Yusuf Aug 15, 2014

    have your charging system checked

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If your car will not start. then try trun the key on do not try and start it just trun it on let it set for about 10 to 20 min.s then trun it off and try to start it. should reset the computor.

Posted on Sep 08, 2010

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Posted on Jan 02, 2017

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I have a passkey 3 on my 2002 cadillac deville and the security system is not letting my car start or crank does anyone know how to fix this problem i'm having without me having to take it to a dealer


You need a capable scan tool to check DTC'S - diagnostic trouble code's .
DTC B2734
DTC B2960
DTC B3031
DTC B3055
DTC P1630
DTC P1631

These would tell why the PCM - engine computer isn't starting the vehicle . There is no by-pass for this anti-theft system . The Dealer is your only hope . Nothing you can do !
The theft deterrent control module produces the theft deterrent fuel and starter enable signal when ignition is ON and the proper transponder key value is detected. The powertrain control module (PCM) monitors the fuel and starter enable signal during crank. If the proper signal is present on the Class 2 Serial Data Circuit, the PCM enables the fuel delivery and starter operation in order to allow the engine to start. If the PCM detects an incorrect password, vehicle theft deterrent (VTD) system failure or attempted vehicle theft, DTC P1631 is set. The engine will not start or crank as long as the condition is present.

Sep 20, 2017 | Cadillac Cars & Trucks

1 Answer

I have a 2004 Buick Rendevouz, and am having a problem with the Passkey 3 system not engaging the starter. clicks inside the vehicle at two relays and at BCM. starter works with wire to battery


How do you know it's a passkey 3 anti-theft system problem ? Light lit on the insturment cluster ? Padlock car symbol . If the security light is lit ,do you have a scan tool that can read these codes
DTC B2960
DTC B3031
DTC B3055
DTC P1626
DTC P1629
DTC P1630
DTC P1631

Not a code reader for the Engine OBD 2 codes .

Aug 23, 2017 | Buick Cars & Trucks

1 Answer

Need to know where the tdm is on a 1997 Cadillac deville can't get security system to shut off should I replace ecm ? Please help


It's hard to get the SECURITY light to go off when you don't know how it works ! Replacing the PCM could cause you more problems too . If a replacement PCM is being installed it must be programmed (flashed) using the latest Techline programming procedures.
Having the vehicle check for DTC ' S - diagnostic trouble codes would be the first step.
DTC P1626 Theft Deterrent Fuel Enable Signal Lost
DTC P1630 Theft Deterrent Learn Mode Active
DTC P1631 Theft Deterrent Start Enable Signal Not Correct
DTC P1632 Theft Deterrent Fuel Disable Signal Received

This anti-theft system does not use a TDM - theft deterrent module . The instrument cluster is the controlling module . Look at a wiring diagram here
http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model engine . Then under systems click on body & accessories , then in subsystem click on security / anti-theft . Click the search button , then on the blue link .You mite be able to do a by-pass if the contacts inside the key lock cylinder is the problem . You can check it with ohm meter . The key has a resistor pellet on the side , you can check the value with ohm meter , find the two wires under the dash at the steering column . Two white wires inside a yellow or orange sheathing . There are videos on youtube !

Apr 13, 2017 | Cadillac Cars & Trucks

1 Answer

How to removed and install The ECM


Your better off taking it to the dealer , after replacing it needs to be programmed or it will not run . Information from the old has to be up loaded to GM Tech 2 scan tool to load on new one ! Then you would need to pay for a subscription to GM'S service programming system to get software to program new ECM .
Program the ECM. Refer to Service Programming System (SPS) in Programming. If you encounter an ECM programming error, with a display message of "Starting Disabled, Remove Key" on the driver information center, with a diagnostic test code (DTC) of P1631, perform the "10-Minute Relearn Procedure" found in Programming Theft Deterrent System Components. Refer to Programming Theft Deterrent System Components . Additional information can be found in service bulletin number 05524 A. Turn OFF the ignition for at least 5 seconds after the programming event is complete. Perform the idle learn procedure. Refer to Idle Learn . Use the scan tool to clear all DTCs.
Of if you a few grand you could buy a J2534 programming tool an
J2534 Reprogramming Tool

May 06, 2015 | 2004 Cadillac CTS

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

1 Answer

02 escalade wont start now code p1631 on scanner how do i fix


This is the theft deterrent system --- the body control module (BCM) and power train control module (PCM) have conflicting codes. The codes between the two must match. If you've replaced one, you need to 're-learn' them so the codes match.

Nov 22, 2013 | 2002 Cadillac Escalade

1 Answer

N o revs p1639 p1631


My generc code list says:
P1631 - Theft deterrent start enable signal incorrect/Main relay malfunction (Power hold)
P1639 - Vehicle ID block corrupted or not programmed.

Scan the immobiliser system and if necessary re-code/program.

Sep 26, 2013 | Cars & Trucks

1 Answer

2002 chevy malibu...can i get a remote starter to by pass the anti theft system


What makes you think this is a anti-theft system problem ? Is the security light lit on the insturment cluster ? When you turn the key to start does the starter spin the engine ? Crank no start ! Or when you turn the key to the start position the starter does nothing . No crank no start . A aftermarket remote start won't by pass anti-theft system . Your best bet would be to take to a qualified repair shop and have it checked for DTC'S - diagnostic trouble codes . Before you let someone start hacking up wiring circuits .
DTC B2947
DTC B2948
DTC B2957
DTC B2958
DTC B2960
DTC B3031
DTC B3033
DTC P1626
DTC P1630
DTC P1631
DTC P1632

Do you know what DTC'S are , these would point to an area of trouble an to a fix .

Aug 21, 2017 | Cars & Trucks

1 Answer

How do you reset the security light on a 2005 chevy cobalt?


There is no reset , if security light is lit there is a problem with the anti-theft system .Should have it checked for DTC'S - diagnostic trouble codes . Could have 8 different B - codes
DTC B0685 DTC B2955 DTC B2960 DTC B3031 DTC B3033 DTC P1626 DTC P1630 DTC P1631
You would need a professional type scan tool to read these type codes , not an OBD 2 code reader .

Apr 14, 2012 | Cars & Trucks

1 Answer

Have a P1631 DTC on my 99 chevy silverado. I know it is a theft deterant problem. How do i fix it?


Here is a website that a free manual can be down loaded for your vehicle


http://ezinearticles.com/?Find-the-Free-Auto-Repair-Manual-You-Need-Online&id=92717

May 01, 2010 | 1999 Chevrolet Silverado 1500

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