2018-2023 Chevrolet Bolt EV Center Pillar: A Guide to Collision Repair and Replacement

Critical Warnings for Buyers

Known Issues, Recalls, and Technical Service Bulletins (TSBs)

NHTSA Recall 23V845000: Seat Belt Pretensioner Fire Risk

A significant safety recall applies to all 2017-2023 Chevrolet Bolt EV models. In a crash severe enough to deploy the front seat belt pretensioners, hot exhaust gases from the pretensioner can vent directly onto the carpet near the base of the center pillar, potentially causing a fire.

• NHTSA Recall Number: 23V845000 (Supersedes 22V930000)
• GM Recall Number: N232421970
• Vehicles Affected: 2017-2023 Chevrolet Bolt EV
• Remedy: Dealers will install metal foil on the carpet near the pretensioner exhaust at the base of the B-pillar. Some vehicles may also receive a pretensioner cover. This repair is performed free of charge.
• Buyer Note: Before purchasing a used Bolt EV, you should check its VIN on the NHTSA website to see if this recall is open. If you are buying a used center pillar, this recall does not affect the part itself, but it is critical safety information for any owner.

TSB 18-NA-166: A-Pillar Trim Fitment Issues

While not for the B-pillar, a technical service bulletin for 2017-2021 Bolt EVs addresses issues with the A-pillar (windshield pillar) interior trim not fitting correctly, popping up, or not staying attached. This was due to an improperly secured instrument panel tie bar. This indicates potential fit and finish issues in the pillar area from the factory that a technician should be aware of during disassembly and reassembly.

Symptoms of a Damaged Center Pillar

Since the center pillar is a static structural component, symptoms of failure are always the result of physical damage from a collision. Even seemingly minor side impacts can compromise the pillar.

• Doors Don't Close Properly: The most common symptom is a front or rear door that is suddenly difficult to open or close, won't latch securely, or has an uneven gap around its edges. This indicates the door opening has been distorted.
• Visible Damage: Obvious signs include creases, kinks, or bends in the pillar itself. Paint that is cracked or bubbling around the pillar can also indicate the underlying steel has been deformed.
• Wind Noise or Water Leaks: If a door no longer seals correctly against the weatherstripping on the B-pillar, you will likely experience increased wind noise or water leaking into the cabin during rain.
• Unusual Noises: Creaking, popping, or groaning sounds while driving, especially over bumps or when turning, can be a sign of a compromised unibody structure.

Buying a Used Center Pillar: What to Inspect

Purchasing a used OEM structural pillar is a cost-effective option for collision repair, but careful inspection is mandatory to ensure you are getting a safe, usable part.

1. Inspect for Any Damage: Meticulously check the entire pillar for any signs of kinks, bends, creases, or stress marks. Even a small dent can indicate the high-strength steel has been compromised. Do not purchase a pillar that has any damage from a previous collision.
2. Check the Cut Points: A used pillar is cut from a donor vehicle. Inspect where the cuts were made. A professional body shop will have specific guidelines on where to cut and section a new pillar. Ensure the salvage yard has left enough extra material beyond the factory-recommended sectioning points for your technician to work with.
3. Verify the Donor Vehicle's History: If possible, get the VIN of the vehicle the part came from. This can help you understand the nature of the collision it was in. You want a pillar from a vehicle that was hit in a different area (e.g., a front-end collision, not a side-impact or rollover).
4. Confirm the Correct Side and Model: Double-check that you are buying the correct pillar for your needs (Right/Passenger side vs. Left/Driver side) and that it came from a Bolt EV, not a Bolt EUV.

Replacement Difficulty and Procedure

• Difficulty Rating: 5 out of 5 (Professional Only)
• DIY Feasible: No

Replacing a center pillar is one of the most complex collision repairs. The process involves:

1. Extensive disassembly of the vehicle's interior, including seats, carpets, headliner, and trim panels.
2. Removal of the front and rear doors on the affected side.
3. Precisely cutting out the damaged section of the original pillar according to manufacturer procedures.
4. Preparing the new and existing metal surfaces for welding.
5. Using a high-powered MIG welder to weld the new pillar into place. Welding ultra-high-strength steel requires specific settings and techniques to avoid weakening the metal.
6. Grinding the welds smooth and applying corrosion protection.
7. Applying body filler, primer, and paint to match the rest of the vehicle.
8. Reassembling the entire vehicle.

Cost Breakdown

The cost to replace a center pillar is significant, with labor being the largest component. Prices are estimates and can vary widely based on location and the extent of related damage.

Note: Labor costs can be much higher if adjacent panels like the rocker panel or roof rail are also damaged.

Technical Specifications & Part Numbers

These part numbers are for the structural reinforcement pillar. Always confirm the exact number with a dealer using your VIN, as supersessions are common.

• Vehicle Fitment: 2018, 2019, 2020, 2021, 2022, 2023 Chevrolet Bolt EV (Hatchback)
• Material: Multi-layer High-Strength and Ultra-High-Strength Steel (HSS/UHSS)
• Known OEM Part Numbers: 42738851 (current, Left side), 42603919 (superseded), 42546444 (superseded), 42518923, 42558514. Note: The prompt specified this guide is for the right-side pillar; buyers must verify the correct part number for the side they need.

Frequently Asked Questions (FAQ)