Antenna

Replace or repair the roof-mounted antenna assembly on a 2023 Chevrolet Bolt EUV, including removal of headliner trim and antenna module replacement.

Warnings

Tools required

Parts

• Roof antenna assembly × 1 — GM 42591739 or equivalent
• Antenna base gasket × 1 — Use OEM specification
• Headliner retaining clips (if damaged) × 4 — Use OEM specification

Preparation

1. Park vehicle on level surface and ensure ignition is off
2. Open both rear doors to provide access to rear headliner area
3. Ensure roof is clean and dry if working on exterior components
4. Verify replacement antenna matches OEM specifications for GPS, cellular, and satellite radio functionality

Procedure

1. 1

   Remove rear assist handle covers
   Carefully pry off the decorative covers on both rear assist handles using a trim removal tool. These covers conceal screws that secure the rear headliner section. Work from the edge nearest the door to avoid breaking clips.
2. 2

   Remove assist handle mounting screws
   Using a T20 Torx driver, remove the two screws from each rear assist handle (four total). Support the handles as you remove the final screw to prevent them from falling. Set handles aside with screws organized.
3. 3

   Lower rear headliner section
   Gently pull down the rear section of headliner material to expose the antenna module and cable routing. You only need 4-6 inches of clearance. The headliner is flexible but avoid creasing. Have a helper support the material if working alone.
4. 4

   Disconnect antenna cable connector
   Locate the antenna cable connector attached to the roof-mounted antenna module. Press the locking tab and pull the connector straight down to disconnect. Do not pull on the cable itself. Note the routing path and any securing clips for reinstallation.
5. 5

   Remove exterior antenna base
   From outside the vehicle, carefully use a plastic pry tool to lift the edge of the antenna base. The shark fin antenna is held by clips and a mounting nut accessed from inside. Support the antenna from outside while working the interior fastener to prevent it from falling.
6. 6

   Remove antenna mounting hardware
   Using an 8mm socket, remove the mounting nut or bolts securing the antenna base to the roof. There is typically one central mounting fastener. Remove the antenna assembly from the exterior, being careful not to drop hardware into the roof cavity.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
7. 7

   Inspect and clean mounting surface
   Inspect the roof opening and antenna mounting surface for corrosion, water intrusion, or damage. Clean the mounting surface with isopropyl alcohol. Inspect the old gasket and ensure no remnants remain on the roof surface. Check for proper drainage channel alignment.
8. 8

   Install new antenna gasket and position assembly
   Place the new antenna base gasket onto the roof opening, ensuring proper alignment with all mounting holes. Position the new antenna assembly from the exterior, aligning the mounting stud or studs through the roof opening. The gasket must seat evenly to prevent water leaks.
9. 9

   Secure antenna mounting hardware
   From inside the vehicle, thread the mounting nut or bolts onto the antenna base studs. Hand-tighten first to ensure proper thread engagement. Using a torque wrench and 8mm socket, torque the mounting hardware to specification in a star pattern if multiple fasteners are present.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
10. 10

    Reconnect antenna cable
    Route the antenna cable along the original path, securing any clips that hold it in place. Connect the antenna cable connector to the module, pressing firmly until you hear or feel a positive click. Gently tug to verify the connection is secure. Apply a small amount of dielectric grease to the connection if desired.
11. 11

    Reinstall headliner and assist handles
    Carefully guide the headliner back into its original position, ensuring all edges are properly seated in their channels. Reinstall both rear assist handles and secure with T20 Torx screws, tightening in a cross pattern to avoid warping. Snap the decorative covers back onto the assist handles.

Reassembly

1. Verify headliner sits flush with no gaps or sagging around assist handles
2. Confirm antenna base sits flush against roof with no gaps where water could enter
3. Check that all interior trim pieces are properly secured and aligned

Verification

• Turn ignition to ON position and verify radio reception on AM, FM, and satellite bands if equipped
• Check infotainment system for GPS signal acquisition (may take 1-2 minutes for initial lock)
• Verify cellular/OnStar connectivity if equipped by accessing connected services menu
• Inspect exterior antenna for proper seating and alignment with roof contour
• Perform visual inspection for water leaks after next car wash or rain event

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