Question about 1998 Pontiac Sunfire

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Anti theft code P1629

P1629 code, vehicle starts for a second and shuts off ! Any workaround to the anti theft det. system? 2005 sunfire...

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  • 176 Answers

Try leaving the key on for 5 to 10 minutes
for the BCM (body control module) to relearn

Posted on Jun 30, 2009

  • William Wilson Aug 07, 2012

    Didn't work

  • hnry hmmt Aug 30, 2013

    I have the code I need the procedure

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Fix a code p1629 for cavalier 97


P1629 obdII code.
THEFT DETERRENT CRANK SIGNAL MALFUNCTION

Vehicle operation is disabled if incorrect key or starting procedure is used.

Read more at the link below.

P1629 GM Forum Buick Cadillac Chev Olds GMC Pontiac chat

Apr 13, 2017 | Cars & Trucks

1 Answer

Cranks and runs for about five second and shuts off. change sparkplugs because they was wet with gas.


Anti-theft system problem will disable fuel injectors after 5 seconds shutting the vehicle off. The plugs are wet because the PCM richens the air fuel mixture for cold start . Is the Security Indicator flashing or on steady ?

Feb 25, 2016 | 2005 Cadillac CTS

2 Answers

Bought car at auction- no keys. Had key made at GM dealer. Programmed key- key works. Car wont start- Codes are P0633 and P1629. cannot clear codes


DTC P0633 : Theft Deterrent Key Not Programmed

When learning the pre-release password, as well as the challenge and response sequence, the engine control module (ECM) is placed in learn mode. DTC P0633 will set automatically as an indicator that the system is in learn mode and not as a fault indicator. Once the password and challenge/response are learned, learn mode will be exited when the engine is successfully started. At this point, the DTC will be cleared. If the ECM does not exit learn mode, P0633 will remain current and indicate a fault.
The "key" referenced in the DTC descriptor does not refer to the vehicle key. In this case, "key" is referring to the challenge response.
DTC P0633 requires a successful engine start to exit the learn procedure and clear the DTC. If an unrelated malfunction exists that causes engine starting to be disabled or otherwise unavailable, learn mode will not exit and DTC P0633 will remain current. In this situation, the cause of the inoperative engine starting must be corrected before diagnosing DTC P0633.
DTC P1629: Theft Deterrent Fuel Enable Signal Not Received
The theft deterrent module (TDM) sends the pre-release password to the engine control module (ECM) via the serial data circuit. The ECM then sends a challenge to the TDM. Both the ECM and TDM perform a calculation on this challenge. If the calculated response from the TDM equals the calculation performed by the ECM, the ECM will allow vehicle starting.
DTC P1629 is an indicator that the challenge response was not received within the required 2 second window. This does not necessarily indicate a fault is present with the TDM or ECM. Factors such as a long engine crank, a delay in the serial data communication, or B-codes set in the TDM will cause DTC P1629 to set. This DTC should not be used as a fault indicator, but rather as a symptom to assist in the diagnosis of these other systems.
Who checked the codes , you -dealer ? You need to have BCM checked for codes B - codes ! you need a up scale diagnostic scan tool for that , dealer Tech -2 !
DTC B3935 57 : Transponder Authentication Error
DTC B3976 46 : Unconfigured Transponder/Vehicle Configuration Not Programmed
DTC B3060 : Unprogrammed Transponder Identification Code Received
DTC B3055: No Transponder Modulation or No Transponder
DTC B3031: Security System Controller In Learn Mode

Aug 07, 2015 | 2006 Buick Lucerne

1 Answer

1998 sunfire in codep1629, how do I fix it


You may want to do some research on the code. The basic problem is the anti-theft system is not seeing a crank signal and shutting down the fuel pump. It could be the security system, or the crank sensor, or other issues.
If you have auto start or a remote starting system it can cause these problems too.

Aug 05, 2012 | 1998 Pontiac Sunfire

1 Answer

1996 pontiac sunfire cranks but won't start, I just replaced the automatic transmission and serpentine belt


Do you see a light anywhere on the dash that says SECURITY? This means that the anti theft system is shutting down your injectors. Very common on GM vehicles. If so, check out this link.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Jun 19, 2011 | 1996 Pontiac Sunfire

2 Answers

My theft light is flashing but my 1997 expedition wont start.The vehicle turns over but just don't start.


ANTI-THEFT SYSTEM Passive anti-theft system
Your ignition key has a unique imbedded transponder which engages engine electronics and allows the vehicle to be started. Without the use of your special ignition key, the vehicle will not start.

During each vehicle start, the coded key is read by the anti-theft system. If the key’s ID code matches the code in the anti-theft system, the vehicle is enabled to start.

Anti-theft system
Briefly illuminates when the ignition is turned to the ON position to verify that the passive anti-theft system is operating properly.

Also, its possisble that tou have actovated the fuel pump switch.

CHeck it.

Jul 20, 2010 | 1998 Ford Expedition

1 Answer

My 00 pontiac grand prix starts 3 seconds and shuts down


P1122 is a throttle position sensor code. P1629 is a theft deterrent system code. P1122 will set when the voltage signal from the throttle position sensor drops below 0.1 volts. Normally, the sensor should measure between 1 volt at idle and 4 volts at full throttle. A failed throttle position sensor could easily cause your problem.

As for the theft deterrent system code, with that code set, the car shouldn't start at all (if the code is active). With P1629, the engine computer should refuse to deliver fuel to the engine. This code can be stored for up to 40 warm up cycles before clearing itself, so unless it is currently active, there may not be any need to worry about it.

I would inspect the wiring and connectors leading to the throttle position sensor. If that wiring is good, I would replace the sensor and see where that got me. Give that a try and let us know how things go.

Jul 28, 2009 | 1998 Pontiac Sunfire

3 Answers

1997 Sunfire won't start. Anti-theft light flashing


try disconnecting the battery for30 min befor you reset with the key on.

Jun 09, 2009 | 1997 Pontiac Sunfire

2 Answers

How to remove or bypass the factory installed anti theft vehicle immobilizer.


in the 1996 sunfire GM uses an anti theft lock system. It can be triggered by all sorts of things. In order to relinquish this you must have a key to turn the ignition. These are not coded just plain cut keys. Once you attain this you put the key in and turn the ignition to the ACC position and wait ten minutes (theft lock light will turn off), turn off and take key out. You MUST do this 3 times and then the theft lock will be disarmed.

May 10, 2009 | 1996 Pontiac Sunfire

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