theft deturantt system 98 gran am

Asked by Jan 26, 2018 at 08:09 PM

Question type: Maintenance & Repair

After replacing the gas tank and fuel
pump on my 98 grand am gt the theft
deterrent system  is not resetting
and making starting the car almost
impossible. Once It is started the
check engine light goes out and so
does the anti theft light. The car idles
fine but once I get moving it acts like
it's starved for fuel. The check
engine light comes on and flashes
and then the engine stalls out. Any
ideas on what to do from here...also
replaced coil. New plugs and wires

5 Answers


Check for codes but it sounds like it's misfiring.


Do you have an extra ignition key?

Yes I do have an extra key. My mechanic hooked up the computer and 6 codes came back. I cranked up the car by hard starting it (I'll explain that later) and one code came back....theft detturant system. So what shall I try with the extra key?


Disconnect battery for a few minutes. After reconnecting it, try it with the extra key

1 people found this helpful.

DTC P1626 Theft Deterrent Fuel Enable Signal Lost----- -----Refer to Power, Ground, MIL, and DLC .----- ----Circuit Description---- -------The Theft Deterrent System, called a Passlock System, is designed to prevent vehicle theft by disabling the engine unless the Passlock cylinder is correctly engaged by a mechanical key. The passlock System utilizes four components for theft detection, the lock cylinder, ignition switch, electronic instrument panel cluster (IPC), and the Powertrain Control Module (PCM).------- ------- When starting the engine, the PCM looks for a password from the Instrument Panel Cluster (IPC) through the UART serial data circuit. If the password is not recognized or not present, the PCM will disable the engine. There are two modes of tamper detection:----- -----Short Tamper Mode - Engine may start and stall quickly. The Theft System telltale will flash on the IPC for 4 seconds.------ ------- Long Tamper Mode (more than three starting attempts or an invalid password is received) - the engine is disabled for at least 10 minutes and the Theft System telltale will flash on the IPC for the 10 minutes.--- ----- --------If the engine is running and serial data communication is lost the engine will continue to run until the ignition is cycled. If serial data communication is not established while attempting to start, the engine will only start and stall. Once the vehicle has established Serial Data communication, the PCM will allow normal engine operation.-------- -----Additional information can be found in Section 9D, Theft Deterrent Systems.----- -----Conditions for Setting the DTC--- ---- ----- An unrecognized or no password is sent to the PCM from the IPC.----- ------A bad timing cycle sent from the IPC to the PCM----- -----Action Taken When the DTC Sets------ -----The PCM will not illuminate the malfunction indicator lamp (MIL).----- ----- The PCM will store conditions which were present when the DTC set as Failure Records data only. This information will not be stored as Freeze Frame data.----- ----Conditions for Clearing the MIL/DTC----- ------ A History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.------ ------ The DTC can be cleared by using the scan tool Clear Info function.------- ------Diagnostic Aids----- -- ---- An intermittent may be caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.-------- ----- --Any circuit that is suspected as causing the intermittent complaint should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring harness.-------- ------ Additional can be found in section 9D Theft Deterrent Systems.-------

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