Pre & Post Repair Scanning
Collision repairs involve more than visible bodywork. Electronic scans help document available system information before repairs and evaluate relevant fault status afterward, supporting a more informed repair process.
Discuss Your Vehicle’s Scanning NeedsWhat are pre-repair and post-repair scans?
Both use compatible diagnostic equipment to communicate with supported vehicle control modules. Their value comes from when they are performed and how the findings are interpreted.
Pre-repair scanning
A pre-repair scan records available diagnostic information at the beginning of the repair process. It can reveal stored faults or communication concerns that warrant inspection and help inform the repair plan.
The report provides a reference point. It does not automatically establish which faults were caused by the collision.
Post-repair scanning
A post-repair scan reviews available electronic information after the applicable work. Findings are evaluated for faults, communication issues, or additional procedures that require attention.
A scan report supports verification, but it does not replace required inspections, calibrations, or functional checks.
Not every recorded fault turns on a warning light.
Some modules can store diagnostic trouble codes without displaying a driver warning. Other concerns may involve communication between modules or systems that are not obvious during a visual inspection.
A quiet dashboard is not a complete electronic assessment. Scanning requirements should be evaluated from the vehicle manufacturer’s procedures and the repair work.
Information a scan may help document
- Stored trouble codes available from supported control modules.
- Code status and related data where provided by the vehicle and equipment.
- Module communication concerns that may require further investigation.
- Changes between reports that help guide additional checks.
Coverage and report detail vary by vehicle, equipment, module condition, and access.
A fault record needs context.
A code description is not a repair instruction. Findings must be considered alongside damage location, symptoms, inspection results, and vehicle-specific service information.
Learn about complete computer diagnosticsIdentify the vehicle and requirements
Review the vehicle’s equipment and applicable scanning procedures for the planned repair.
Capture the initial information
Perform the appropriate pre-repair scan when vehicle condition and access permit, and preserve the findings.
Investigate relevant concerns
Determine whether reported faults require diagnosis, repair, initialization, or other procedures.
Review post-repair results
Evaluate remaining or newly recorded information and complete the additional verification required for the repair.
Scanning does not substitute for calibration.
A scan retrieves electronic information. ADAS calibration performs a specified reference or learning procedure for applicable driver-assistance equipment. Clearing codes does not accomplish that calibration.
Depending on the work performed, a vehicle may also need programming, initialization, alignment, road testing, or other checks. Each requirement must be evaluated separately.
Explore ADAS calibration requirementsUnderstand what the reports can tell you.
Does every vehicle require a pre- and post-repair scan?
Requirements depend on the vehicle manufacturer’s guidance and the repair being performed. They should be checked for the specific vehicle rather than assumed from the visible damage alone.
Can a scan prove a fault was caused by the accident?
A stored code alone generally cannot establish causation. Collision details, symptoms, physical findings, available records, and diagnostic testing must be considered together.
Why might codes appear during the repair process?
Disconnecting components, changes in voltage, or operating the vehicle while parts are removed can create some fault records. Their significance must be evaluated rather than automatically treated as new component failures.
Does clearing codes mean the problem is fixed?
No. Clearing a code removes a record when the system allows it; it does not correct the underlying cause. Required verification may involve additional operating conditions, tests, or procedures.
Does a clean post-repair scan guarantee the vehicle is safe?
No. A scan cannot assess every mechanical, structural, or electronic condition. It is one part of repair verification alongside the applicable inspections and functional checks.
What if the scan tool cannot communicate with a module?
The cause may involve vehicle condition, power supply, network faults, equipment coverage, or access requirements. Further investigation may be needed before the module can be assessed.
Can I request copies of the scan reports?
Ask about the reports available for your repair. Report format and detail depend on the equipment and vehicle; findings may also need explanation from the repair team.
How much does pre- and post-repair scanning cost?
Cost depends on the vehicle, scanning requirements, and whether additional diagnosis is necessary. A scan and follow-up diagnostic testing involve different work, which should be explained in the repair scope.