What is the turn signal bulb number for a 2004 Tahoe?

The turn signal bulbs for a 2004 Chevrolet Tahoe are typically 3157 dual-filament bulbs; most models use 3157 for both front and rear signals, with 3157A variants used in some markets or trims.

Common bulb numbers by location

Here’s a quick reference for the most common bulbs used in the Tahoe's turn signal housings.

• Front turn signals: 3157 (amber) or 3157A in certain markets.


• Rear turn signals: 3157 (amber) or 3157A in certain markets.

In many Tahoe configurations, the same 3157 dual-filament bulb serves both front and rear signals, but always confirm with your specific vehicle's manual or by inspecting the current bulb.

How to verify the correct bulb for your vehicle

To ensure you buy the exact bulb, use these verification steps.

• Consult the owner's manual or a GM parts catalog for the exact bulb number for your trim and market.


• Remove a turn signal bulb and read the numbers on the glass or base to confirm the base type (e.g., 3157/3157A).


• Compare the bulb base and filament arrangement; 3157 is a dual-filament bulb used for both tail/stop and turn functions.


• If upgrading to LED replacements, choose CANBUS-compatible 3157 LEDs or plan for load resistors to prevent hyper-flashing.

Verifying before buying helps avoid mismatched bases or incorrect brightness that could affect signaling performance.

Replacement steps

When you’re ready to replace a failing bulb, follow these general steps.

1. Turn off the vehicle and set the hazard switch off. Open the appropriate lens housing (front corner or rear taillight) to access the bulb socket.


2. Remove the bulb by turning it counterclockwise (or releasing the retaining clip) and carefully pull it out.


3. Insert a new 3157 (or 3157A) bulb with the same orientation and push until it seats; twist to lock if required.


4. Reassemble the lens housing and test the turn signal at the front and rear to confirm proper operation.

Be sure to handle bulbs with clean hands or gloves; oils on skin can reduce bulb life, and always test before final assembly.

Summary

For a 2004 Tahoe, the standard turn signal bulb number is typically 3157, with 3157A variants used in some markets. Front and rear signals commonly share the same bulb type, but always verify by checking the manual, current bulb, or a parts catalog. Replacing bulbs is straightforward with basic access to the housings, and LED replacements require compatibility considerations.