WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fob 1 Battery: The scan tool displays OK to indicate a good battery voltage level was last received.

Fob 2 Battery: The scan tool displays OK to indicate a good battery voltage level was last received.

Fob 3 Battery: The scan tool displays OK to indicate a good battery voltage level was last received.

Fob 4 Battery: The scan tool displays OK to indicate a good battery voltage level was last received.

Last Fob Button Pressed: The scan tool displays Dr. Door Unlock, All Door Unlock, Door Lock, indicating the last input received from a programmed fob.

Last Fob Used: The scan tool displays FOB 1-4 to indicate the number of the last transmitter used

Fob 1 Programmed: The scan tool displays Yes/No. The scan tool displays Yes if a transmitter is programmed to this numeric position.

Fob 2 Programmed: The scan tool display Yes/No. The scan tool displays Yes if a transmitter is programmed to this numeric position.

Fob 3 Programmed: The scan tool displays Yes/No. The scan tool displays Yes if a transmitter is programmed to this numeric position.

Fob 4 Programmed: The scan tool displays Yes/No. The scan tool displays Yes if a transmitter is programmed to this numeric position.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Scan Tool Data Definitions

Use the Manual With the Right Hardware

When to See a Mechanic