Gmc gives p1626 code how do I fix it yourself

Question

My truck crank but will not start try's to start when you let off key but will not key running

Answer 1

Hi there

This code is for the theft deterrent. With the symptoms it sounds like the ignition switch is going to need to be replaced, then you should be able to do a relearn.

1. Turn ignition on. 2. Attempt to start the engine, and then release the key to the “ON” position. 3. Observe the “SECURITY” indicator light. After 10 minutes the “SECURITY” indicator light will turn off. 4. Turn ignition to the “OFF” position, and wait 10 seconds. 5. Attempt to start the engine, and then release the key to the “ON” position. 6. Observe the “SECURITY” indicator light. After 10 minutes the “SECURITY” indicator light will turn off. 7. Turn ignition to the “OFF” position, and wait 10 seconds. 8. Attempt to start the engine, and then release the key to the “ON” position. 9. Observe the “SECURITY” indicator light. After 10 minutes the “SECURITY” indicator light will turn off. 10. Turn ignition to the “OFF” position, and wait 10 seconds. 11. Vehicle has now learned the new password. Start the engine. 12. With a scan tool, clear any trouble codes. NOTE: For most cars, one 10-minute cycle will be enough for the vehicle to learn the new password. Perform all 3 cycles if the car will not start after 1 cycle. Most trucks will require all 3 cycles for learning the password.