Damage Analysis and Hidden Damage Identification
What this domain tests
Damage analysis is the ability to find what is not visible and to prove it. The exam tests direct, induced and inertia damage, energy paths through the structure, teardown and blueprinting, measuring, and scan-based discovery.
Core rules
- Direct damage is at the impact point. Induced damage appears where energy transferred - a kink in a rail, a distorted apron, a misaligned gap. Inertia damage appears away from the impact, often at the opposite end, from the vehicle's mass moving against itself.
- Follow the energy path: bumper reinforcement, absorbers, crash sensors, frame rails, apron, strut tower, hinge pillar, rocker, floor, opposite rail.
- Teardown or blueprinting is the only reliable way to write a complete estimate. Write the visible estimate, then tear down and supplement the hidden items.
- Scan before and after. A pre-scan establishes existing faults; it also finds latent codes caused by the collision.
- Measure when structure is involved; verify gaps, panel flushness and suspension angles.
Worked example
A low-speed front impact shows only a cracked bumper cover and a scuffed grille. Teardown reveals a crushed energy absorber, a bent bumper reinforcement, a cracked sensor bracket and a stored front-sensor DTC. The initial estimate covered the cover and refinish; the supplement adds absorber, reinforcement, bracket, sensor scan and calibration. The reasoning: the cover is the symptom, the energy path is the damage.
Traps
Writing a final estimate from a dirty, assembled car; skipping the scan because no light is on; ignoring the opposite end; failing to photograph hidden damage before it is repaired; writing a supplement as a brand-new estimate with no link to the original; and forgetting the alignment or calibration time that follows structural or suspension work.