Replace a single headlight bulb on the 2023 Chevrolet Bolt EUV by accessing the bulb assembly from behind the headlight housing in the engine compartment.

Warnings

Tools required

Parts

• H11 LED headlight bulb × 1 — Use OEM specification GM 84037566 or equivalent

Preparation

1. Park vehicle on level surface and turn off all systems
2. Open hood and secure with prop rod
3. Identify which headlight requires bulb replacement (driver or passenger side)
4. Allow headlight assembly to cool if vehicle was recently used

Procedure

1. 1

   Access headlight bulb assembly
   Locate the headlight bulb access cover on the rear of the headlight housing in the engine compartment. On the driver side, you may need to move aside some wiring harnesses for better access. The bulb socket is positioned directly behind the headlight lens assembly.
2. 2

   Remove bulb access cover
   Rotate the bulb access cover counterclockwise approximately 1/4 turn and pull it straight back to remove. Set the cover aside in a clean location to prevent contamination.
3. 3

   Disconnect electrical connector
   Grasp the electrical connector at the base of the bulb socket. Press the release tab and pull the connector straight back away from the bulb. Do not pull on the wiring harness itself.
4. 4

   Remove bulb retaining ring
   Locate the spring-loaded retaining ring that secures the bulb in the headlight housing. Press down gently and rotate counterclockwise to release the ring mechanism. Carefully remove the retaining ring and set aside.
   Torque spec

   Bulb Retaining Ring5 Nm (4 lb-ft)
5. 5

   Extract old bulb
   Carefully pull the old bulb straight out of the headlight housing. Avoid twisting or rocking the bulb excessively. Inspect the bulb socket and housing for any signs of corrosion, moisture, or damage.
6. 6

   Install new bulb
   Wearing clean lint-free gloves, remove the new bulb from its packaging without touching the glass envelope. Align the bulb tabs with the slots in the headlight housing and insert the bulb straight in until it seats fully against the housing.
7. 7

   Secure bulb with retaining ring
   Position the retaining ring over the bulb base and engage it with the housing. Rotate clockwise while applying gentle pressure until the ring locks into place securely. Verify the bulb cannot move or rotate in the socket.
   Torque spec

   Bulb Retaining Ring5 Nm (4 lb-ft)
8. 8

   Reconnect electrical connector
   Align the electrical connector with the bulb socket terminals and push firmly until you hear or feel a positive click. Gently tug on the connector to verify it is fully seated and locked.
9. 9

   Reinstall access cover
   Position the bulb access cover over the rear of the headlight assembly, aligning the tabs. Push the cover in and rotate clockwise approximately 1/4 turn until it locks into position.
   Torque spec

   Cover Screws11 Nm (8 lb-ft)

Reassembly

1. Ensure all wiring harnesses moved during access are returned to their original positions
2. Verify the access cover is fully seated and locked to prevent moisture intrusion

Verification

• Turn on the headlights and verify the new bulb illuminates properly
• Check both low beam and high beam operation to ensure correct installation
• Verify no warning lights appear on the instrument cluster related to exterior lighting
• Inspect around the headlight housing to ensure no gaps in the access cover that could allow moisture entry
• Close hood and verify headlight aim appears normal; adjust if necessary

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