30-Minute Learn Procedure (Avalanche, Astro, Blazer, Cab & Chassis, Chevy Express, Cutaway, Escalade, Escalade EXT, Jimmy Canadian, RV Cutaway, S10 Pickup, Safari, Savana, Savana Camper Special & Savana Special, Sierra, Silverado, Sonoma, Suburban, Tahoe, Yukon & Yukon XL)

If replacing a PCM/ECM with a GM Service Parts Operations (SPO) replacement part, after programming, these modules will learn the incoming fuel continue password immediately upon receipt of a password message. Once a password message is received, and a password is learned, a learn procedure must be performed to change this password again. A PCM which has been previously installed in another vehicle will have learned the other vehicle's fuel continue password and will require a learn procedure after programming to learn the current vehicle's password.

Use this procedure after replacing:

• Passlock™ Sensor
• Passlock™ Module.
• PCM

NOTE: Ensure current Techline® Service Programming System (SPS) software is used.
1. Turn ignition on, with engine off.
2. Attempt to start engine, then release key to ON position. Vehicle should not start.
3. Observe SECURITY indicator light for about 10 minutes. Indicator light should turn off.
4. Turn ignition off and wait 5 seconds.
5. Repeat steps  1- 4 two more times for a total of 3 cycles/30 minutes. Vehicle is now ready to relearn the Passlock™ sensor data code and/or passwords on the next ignition switch transition from OFF to CRANK position.
NOTE: Vehicle learns Passlock™ sensor data code and/or password on the next ignition switch transition from OFF to CRANK position. Ignition must be turned off before attempting to start vehicle.
6. Start engine. Vehicle has now learned the Passlock™ sensor data code and/or password.
7. Using scan tool, clear any DTCs. History DTCs will self clear after 100 ignition cycles.