Overview
In a significant collision, the forces can shift the structure of the vehicle. Most modern cars use unibody construction, where the body and frame are integrated. Structural damage can affect how panels fit, how the car drives and how it protects occupants in a future crash.
Shops use measuring systems to compare the vehicle's dimensions with manufacturer specifications. If the structure is out of spec, it may be straightened on a frame machine or structural parts may be replaced, following manufacturer procedures. Some components are not meant to be straightened and must be replaced.
Wheel alignment is a separate but related issue. A collision can bend suspension components or change alignment angles, which can cause pulling, uneven tire wear or an off-center steering wheel.
What to expect, step by step
- Measuring the structure against specifications.
- Inspecting suspension and steering components.
- Road testing to confirm handling.
- Performing a wheel alignment after repairs.
- Straightening or replacing damaged structural components.
What affects the outcome
- Documentation of measurements can be useful for records.
- Structural repairs should follow manufacturer procedures.
- Alignment may reveal bent parts that need replacement.
- Some parts must be replaced rather than straightened.
- ADAS calibrations may be required after alignment.
Local notes for the San Francisco Bay Area
In the Bay Area, tight parking and dense traffic contribute to many minor collisions, scrapes and bumper damage. California has its own rules about auto repair estimates and shop registration, and the state's Bureau of Automotive Repair is a resource for consumers.
We take inquiries from San Francisco, Oakland, San Jose, Fremont, Walnut Creek.
What to have ready
- Mention whether the vehicle has driver-assistance features such as cameras, parking sensors or radar, since repairs near them may require calibration.
- Have your insurance claim number ready if you have filed one, along with the adjuster's contact details.
- Keep any police or incident report numbers handy.
- Say whether you need a rental car or plan to rely on coverage for one.
- Note the year, make, model and trim of the vehicle, and the paint color name or code if you know it.
Warning signs
- Pressure to sign over insurance payments before you have reviewed the estimate.
- No clear process for supplements when hidden damage is found after disassembly.
- Unwillingness to explain whether new, used or aftermarket parts will be used.
- No answer about whether driver-assistance systems will be checked or calibrated after repairs.
- Vague or no warranty terms on paint and workmanship.
How to vet a provider
- Will ADAS systems need calibration?
- Will you measure the vehicle's structure?
- Can I see measurement printouts?
- Do you follow manufacturer structural repair procedures?
- Will you replace or straighten damaged parts?
Quick answers
- What is frame damage?
- It refers to damage to the vehicle's structural components, which may affect safety and fit.
- Can a car be safe after frame damage?
- Properly repaired vehicles can be returned to service; repair quality and procedures matter.
- Why is my car pulling after an accident?
- Alignment changes or bent suspension parts are common causes.
Related topics
- Bumper Repair: Bumper cover repair versus replacement, hidden damage, sensors and questions to ask an auto body shop.
- Collision Repair: What collision repair involves after an accident, how estimates and insurance usually work, and questions to ask a body shop.
- Paint and Refinishing: How auto paint refinishing works, color matching, clear coat and questions to ask a body shop about paint work.
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