EV Pre-Purchase Inspection Checklist

Before you book the mechanic: self-diagnosis steps you can do

If you're considering a specific used EV but haven't yet decided whether a full technician inspection is worth the cost, there are several observations you can make during a test drive or at the seller's location. These are not substitutes for a qualified technician's inspection — but if any of them reveal concerning signals, you'll know the mechanic appointment is worth the expense.

During the test drive

• Check the battery's full-charge range estimate. The vehicle should be at 100% charge (or as close as possible) at the start of the drive. Note the displayed range estimate. Compare to the vehicle's original EPA or WLTP range. If the estimate is more than 20% below original spec, battery capacity loss is likely significant.
• Monitor percentage drop versus distance. Drive a measured route of at least 15 kilometres at steady highway speed. Note battery percentage at start and end, and calculate actual consumption. A vehicle showing 3-4% drop per 10 km at highway speeds is within normal range for most EVs; more than 5% per 10 km at moderate speeds suggests significant degradation or a problem with energy delivery.
• Listen and feel for abnormal behavior. Regenerative braking should be smooth and predictable. Acceleration should be linear without hesitation or jerk. Any unusual whines, clicks, or vibrations warrant technician investigation.
• Test fast charging if possible. If a DC fast charger is accessible, start a session and observe the peak charge rate. Every EV tapers charging speed as the battery fills, but the peak rate in the 10-50% range should be close to the manufacturer's published spec. A vehicle that never reaches more than 50% of its rated peak charging rate has either degraded batteries, thermal management issues, or software limitations worth investigating.

Overnight and parked-vehicle checks

• Overnight percentage loss. If you can arrange a multi-hour observation, note the battery percentage when the vehicle is parked, then check again 8-12 hours later with the vehicle undisturbed. A healthy EV loses 1-3% overnight from vampire drain. More than 5% overnight loss without active use indicates potential issues with standby systems, 12V battery, or thermal conditioning.
• Unexplained warnings or service messages. Note any warning lights, service messages, or error codes displayed on the dashboard during your inspection. Ask the seller when these first appeared and what was done about them.
• Phantom consumption while charging. If you can observe the vehicle charging, verify that the advertised charge rate matches what is actually being delivered. A vehicle plugged into a 50 kW DC fast charger should be drawing close to that rate at 20-50% state of charge; significantly lower rates at those battery levels suggest thermal or battery issues.

Visible-to-anyone diagnostic checks

• Tire condition. Uneven wear patterns, mismatched tire brands, or season-inappropriate tires tell you about the previous owner's care standards. These are the single easiest visual signal of overall upkeep.
• Service history documentation. Ask to see every service record. If the seller cannot or will not produce complete records from the vehicle's entire ownership period, treat that as a significant warning — and factor it into the price you're willing to pay.
• Recall campaign status. Before booking any inspection, run the VIN yourself through the free NHTSA database (United States) or Transport Canada database (Canada) to see what open recalls exist on this specific vehicle. A seller who has not completed an open safety recall has either been unable to afford the dealer visit or has deliberately avoided it — either way you should know before the sale.
• Charging port condition. Visually inspect the charging port. Signs of corrosion, warped pins, or physical damage indicate either rough use, electrical faults during charging, or environmental exposure.

If any of these self-diagnosis steps reveals concerning signals, book the full technician inspection. If the vehicle passes all of them with no flags, the mechanic appointment may still be worthwhile for the battery SoH scan alone — but you'll have much higher confidence in the overall vehicle condition before you spend the inspection fee.

What the checklist includes

• Battery health diagnostics — instructions for state-of-health scan via OBD2 or manufacturer tooling, with benchmark capacity expectations for the specific vehicle year, named diagnostic tools (Aviloo, DEKRA, Recurrent, dealer-tier), range analysis protocol, cell voltage balance spec
• Recall verification — checklist reference to the specific regulators for the vehicle's region (NHTSA, Transport Canada, DVSA, EU, KBA, Rappel Conso)
• Tire condition analysis — wear patterns, brand consistency, season-appropriateness, tread depth
• Service record review — documented maintenance history, software update records, warranty claims
• Physical inspection — undercarriage, signs of collision repair, unauthorized modifications, interior condition
• Vehicle-specific known issues — model-specific items pulled from our database, e.g., I-PACE thermal recall remedy verification or Bolt EV battery module service status
• Sign-off section — technician signature, shop stamp, date, notes

How to use the checklist

1. Fill out the form above with your vehicle details
2. Click "Generate inspection checklist" — your customized checklist opens in a new tab
3. Print directly (Ctrl+P on Windows, Cmd+P on Mac), or save as PDF (select "Save as PDF" in the print destination)
4. Email or bring the PDF to your qualified EV technician
5. The technician completes each item during inspection and signs at the bottom
6. Keep the completed checklist with your vehicle records — it becomes evidence of due diligence if warranty or condition disputes arise later