2015 Chevrolet Tahoe — Bulb Sizes (Headlight, Tail, Fog)

Quick reference

Notes on trim/market variation:

• U.S. retail 2015 Tahoes generally use halogen projectors (9012) for low beams—no OEM HID/LED headlamps from the factory this year. Some export/PPV/fleet configurations may differ.
• Rear lamps on most U.S. models combine stop/turn in a red 7443. Certain export or fleet versions may use an amber 7440/7440A for a dedicated turn signal. Verify your tail lamp style before ordering.
• Interior dome sizes can vary (second/third row and cargo). Many use a 578 (41mm) festoon; others use 194/T10 wedges. Check the housing before purchasing.
• The center high‑mount stop lamp (CHMSL) is commonly an LED sealed unit on this generation and is not serviced by a standard bulb.

LED vs halogen upgrade considerations

• CANBUS and hyperflash: The Tahoe’s BCM monitors exterior bulbs. Swapping turn signals to LED without load resistors or a CANBUS‑ready LED can cause hyperflash and bulb‑out warnings. Use quality 7444NA/7443 LEDs with built‑in resistors or add 6Ω, 50W resistors in parallel per circuit.
• DRL/high beam compatibility: Because the 9005 serves double duty (high beam and DRL at reduced voltage), choose LEDs expressly rated for PWM/DRL use to prevent flicker or thermal shutdown. Some owners disable DRL in the vehicle settings when using non‑DRL‑safe LEDs.
• Headlight fitment: The 9012 socket is unique. Use 9012‑specific LED or HID retrofit bulbs; avoid modifying H11/H9 tabs unless you know the alignment/cutoff will remain correct. Projector optics are sensitive to emitter placement.
• Fog light LEDs: The H16/5202/PSX24W family has several keyed bases. Choose an LED labeled for 2015 Tahoe/Suburban fit to avoid clocking or locking issues in the fog housing.
• Heat management: Tight housings (fog and headlamp dust caps) require compact LED heat sinks. Oversized fans can interfere with caps or wiring.

How to replace each bulb

• Low beam (9012): Turn the wheel out, pull back the inner fender liner for the headlamp rear cap, twist the 9012 bulb counterclockwise, unplug, and swap. Avoid touching the glass of halogen bulbs.
• High beam/DRL (9005): Access from behind the headlamp (similar to low beam). Twist and remove; ensure the new bulb clocking matches the tab pattern.
• Fog light (H16/5202): From underneath or through the lower splash shield, reach the rear of the fog housing. Depress the locking tab and rotate the bulb counterclockwise. Do not pry on the bezel.
• Front turn/parking (7444NA) and front side marker (194): Access the headlamp rear, twist the sockets out. The 7444NA is a larger dual‑filament wedge; the side marker is a small T10/194.
• Tail/brake/turn (7443) and rear side marker (194): Open the liftgate, remove the two lamp‑to‑body screws on the tail lamp, and pull straight rearward to release the alignment pins. Twist out the 7443 and 194 sockets, replace bulbs, and re‑seat the housing.
• Reverse (921): With the tail lamp removed (same steps as above), twist the backup lamp socket and replace with a 921.
• License plate (194): Remove the lens screws above the plate, drop the lens, twist the 194 socket, and swap the bulb.
• Interior map (194): Carefully pry the front overhead lens with a trim tool, pull the 194 wedge straight out. Observe polarity if installing LEDs.
• Interior dome (578 festoon common): Pry the lens, release the festoon from spring clips. If installing LED, match length (31–42mm as equipped) and observe polarity.

Common lighting issues for this generation

• Dim low beams: Many owners report weak output from the factory 9012 halogen projectors. Fresh OEM bulbs or high‑quality 9012 LEDs/HID retrofits (with proper beam focus) can significantly improve visibility.
• Hyperflash after LED swaps: Without proper resistors/CANBUS LEDs, front/rear turn signals will hyperflash and may log BCM faults. Correct with load resistors or approved LED modules.
• DRL flicker with LEDs: Non‑DRL‑rated 9005 LEDs may flicker or shut off when run at reduced voltage. Choose DRL‑compatible LEDs or adjust DRL settings.
• Moisture in tail or headlamps: Check housing seals and vent caps. Reseal or replace gaskets if condensation persists.
• Melted fog lamp sockets: Over‑wattage halogen upgrades in the H16/5202 fogs can overheat sockets. Stay with OEM wattage or quality LEDs.

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