Follow these 3 simple steps:

1. Check the Global A Vehicle List above
2. Find your EXACT vehicle model AND year
3. If found (except Express/Savana) → Use IMMO  |  If NOT found → Use VATS

Quick examples:

• 2018 Silverado? → In the list → Use IMMO
• 2012 Silverado? → NOT in list → Use VATS
• 2018 Savana? → In list BUT → Still use VATS (exception!)

Don't worry about the technical term. Just check the list:

• If you see your vehicle AND your year → You have Global A (use IMMO)
• If you DON'T see it → You don't have Global A (use VATS)

This is unusual. If it worked, great! But this typically means:

• Your PCM/ECM might not have IMMO code
• Or it was ordered with disabled VATS

Action: If the vehicle starts and runs normally, clear any remaining error codes with a scan tool.

This means the 30-minute procedure didn't work. You have 2 options:

1. Option 1 (Easiest): Use Auto101 GM Tool to program it
2. Option 2: Take it to a locksmith or use GM SPS2 programming

Why didn't it work? Your vehicle may need V.T.D programming instead of the basic relearn.

YES! Very important:

• Turn key to ON position (don't start engine)
• Try to crank (it won't start — that's normal)
• Leave key in ON position while security light is on
• Engine stays OFF the entire 30 minutes

• Don't turn on radio, lights, or accessories
• Don't open doors during the 10-minute cycles
• Don't touch the key or steering wheel
• Just sit and wait, or wait outside the vehicle

You need to start over completely:

1. Charge your battery to at least 12V
2. Use a battery charger to maintain voltage during procedure
3. Start the 30-minute procedure from Step 1 again

Pro Tip: Always use a battery charger during this procedure to prevent failure!

The relearn failed. You must:

1. Turn OFF ignition and wait 5 seconds
2. Start the entire 30-minute procedure over
3. Remember: You MUST turn OFF ignition before attempting to start!

You have 4 options:

1. Auto101 GM Tool (Recommended — easiest for DIY)
2. Professional key programmer
3. Locksmith service
4. GM SPS2 Programming (dealership tool)

Note: The 30-minute procedure does NOT work for IMMO vehicles!

Usually 10–20 minutes with the right tool:

• Connect tool to OBD port
• Follow on-screen instructions
• Program key(s) to new module
• Done!

Yes, you typically need to program at least 2 keys to the new module. Some tools may require all keys to be programmed.

Best Practice: Have all your keys with you when programming.

These are security-related codes. Follow the normal procedure:

• Check if your vehicle is in the Global A list
• Use IMMO if listed (except Express/Savana)
• Use VATS 30-minute if not listed

After completing the procedure, clear codes with a scan tool.

This happens after BCM replacement. Two options:

If BCM is 2007 or newer:

• Use scan tool to perform "Setup SDM Primary Key in BCM" (see Additional Procedures section)

If BCM is older than 2007:

• You need GM SPS2 V.T.D programming or Auto101 GM Tool
• The scan tool procedure won't work on pre-2007 BCMs

Yes, these codes mean you need Crankshaft Position Variation Learn:

1. Use a scan tool (required)
2. Follow the procedure in the Additional Procedures section
3. Takes about 10–15 minutes

Can't skip this! Vehicle may run rough or not start properly without this procedure.

This is normal after BCM replacement (2007+). Easy fix:

1. Use scan tool
2. Navigate to BCM → Configuration/Reset Function
3. Perform "Brake Pedal Position Sensor Learn"
4. This fixes the reversed brake lights issue

See Additional Procedures section for detailed steps.

If you have Brake Pedal Position (BPP) sensor, you need calibration:

• Follow Brake Pedal Position Sensor Calibration in Additional Procedures section
• This is the same procedure that fixes reversed brake lights
• Requires scan tool

At least 12V during the entire procedure:

• Check voltage with multimeter or battery tester
• Use battery charger if voltage is low
• Weak battery = procedure will fail

Pro Tip: Connect a battery maintainer/charger during the 30-minute procedure.

• Battery charger = constant stable voltage (best option)
• Jumper cables = okay but less reliable
• Weak battery alone = procedure will fail

VATS! This is a critical exception:

• Express and Savana are listed in the Global A list
• BUT they still use VATS system, not IMMO
• Always use the 30-minute procedure for Express/Savana

• 2010 Silverado is NOT in the Global A list (list starts at 2014 for Silverado)
• Use VATS 30-minute procedure

• Terrain (2010–2022) is in the Global A list
• 2020 is within that range
• Use IMMO programming (not 30-minute procedure)

For VATS procedure — check:

1. Did you complete all 3 cycles (30 minutes total)?
2. Was battery voltage above 12V the entire time?
3. Did you turn OFF ignition before trying to start?
4. Is your vehicle actually a VATS vehicle? (Check the list again)

For IMMO procedure — check:

1. Did programming complete successfully?
2. Was key programming confirmed?
3. Are you using the programmed key?

If all checks pass: Your vehicle may need professional programming via Auto101 GM Tool, locksmith, or GM SPS2.

A blinking security light usually means a communication issue:

• The module may not be properly installed
• There might be a wiring problem

Action: Check all module connections, verify correct module was installed, check for diagnostic codes with scan tool.

You can attempt it multiple times, but:

• If it fails 2–3 times, it's not going to work
• Your vehicle likely needs programming instead
• Don't waste time — move to Auto101 GM Tool or locksmith

DON'T need scan tool for:

• Basic 30-minute VATS relearn

DO need scan tool for:

• IMMO programming
• Crankshaft Position Variation Learn (P0315/P1336)
• SDM Relearn (B1001 airbag code)
• Brake Pedal Position Sensor Calibration
• Clearing diagnostic codes

For basic code reading = Yes. For special procedures = No.

You need a scan tool with "Special Functions" or "Module Setup" capability. Cheap code readers can't perform relearn procedures.

Auto101 GM Tool supports all special functions listed on this page.

If the car starts and runs: Yes, it's safe to drive, but complete the relearn as soon as possible.

If the car won't start: Complete relearn first.

You can do it yourself if you're comfortable following step-by-step instructions and have the required tools.

When to call a professional:

• If the 30-minute procedure fails multiple times
• If you need IMMO programming but don't have tools
• If you get error codes you don't understand