I just installed a new key ingition assembly in my 2005 impala, the car will turn on but will not attempt to start., if the battery is dead i will hear a clicking sound for it to start, but all i hear is a humming sound from the engine and it said i have to reset the pcm in the book which i did but am lost and stuck at a place i cant get around, any advice, i cant get the car to the dealer and i just got back form iraq and getting ready to go back, this is the only car we have and i need help, maybe C4 will help, but we need a car. please help. thanke Raymond
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DTC P1631 Theft Deterrent Fuel Enable Signal Not Correct
The powertrain control module (PCM) controls the fuel injector operation and the starter operation based on a vehicle theft deterrent (VTD) password from the vehicle body control module (BCM). When the ignition is first turned ON, the BCM sends a programmed theft deterrent password to the PCM. The PCM acknowledges the password and responds to the BCM that normal fuel injector and starter operation will continue. If the PCM detects an incorrect password, a theft deterrent system failure, or an attempted vehicle theft, DTC 1631 will set. The engine will not start or crank as long as the condition is present.
Diagnostic Aids
DTC P1631 indicates that the vehicle theft deterrent password that the PCM has learned does not agree with the password received from the VTD system. This condition can occur if the BCM has been replaced and the PCM Password Learn function has not been enabled. If the BCM has been replaced, the password must be relearned.
Step
Action
Yes
No
1
Did you perform the Diagnostic System Check - Vehicle?
Go to Step 2
Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
Perform the Password Learn Procedure. Refer to Programming Theft Deterrent System Components .
Did you complete the procedure?
System OK
30-Minute Learn Procedure
Turn ON the ignition, with the engine OFF.
Attempt to start the engine, then release the key to ON; the vehicle will not start.
Observe the SECURITY telltale. After approximately 10 minutes, the telltale will turn OFF.
Turn OFF the ignition, and wait 5 seconds.
Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes. The vehicle is now ready to relearn the Passlock™ Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK.
Important: The vehicle learns the Passlock™ Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
Start the engine. The vehicle has now learned the Passlock™ Sensor Data Code and/or password.
With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles.
Hi... Yoou will need to program the new Ignition lock cylinder.
This vehicle use a Theft Deterrent system....
The passlock sensor Is part of the cylinder assemble
Some times this prosses need to be done more than one time.
If the first FAIL..
.
Here is the prosses to program the new cylinder.
Be sure to have a good battery, or use a battery charged during the prosses..
Remove the old Ignition switch. Install the new Ignition switch. with the new Passlock sensor. Turn the key to on position and try to start a few senconds. them leave the key on run position. For 10 minutes and NOT more than 11 minutes. Them turn the key to OFF position for exactly 30 seconds. Them turn the key to Run position 10 minutes or 11. them turn back the key to OFF position for 30 seconds. Them turn the key to Run position 10 minutes or 11, Turn the key to OFF position and wait 1 minute, them try to start the vehicle. If the car start you are DONE. But if Not Letme know to give you more information.
After you replace the ignition switch turn the key to start the car and release leave the key were it stops after trying to start wait 10 minutes until security light goes out turn key to full off position then repeat the above procedure two more times for a total of three on the 3rd attempt to start car wait for light to go out then turn key to full off positoion wait 10 seconds then try to start car body control module should learn new pass code and the car should start.
Big john, J@J Automotive
no, you just need to ONLY replace the cylinder and if the new key has a chip in it get a copy made and use that one with your old master key held next to it to start the car.
Hello, It sounds as if you are having ignition switch problems on your Impala. The tow truck driver is correct, Gm has had a problem with keys but that is because the theft deterent system is looking for a particular shaped key(original-new shaped) key and if your key is worn then you can go to the dealer with your title or bill of sale, or etc, and get new keys made. In the mean time, If it do this again turn the switch off, turn it back to start, and then leave on for ten minutes. This will relearn the key but when you get the new key you wil have to do this again with the relearn.
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