CARFACTBOOK / DIAGNOSTIC REFERENCE

Your car. Your symptoms. The next safe check.

Select your vehicle, explore its systems, and choose what you are seeing. Follow existing evidence-based checks, understand when to stop safely, and prepare a useful mechanic handoff—without guessing which part failed.

01 / Your diagnostic vehicle

Select your exact car

Start with the make, model and chassis code. The system list below then stays connected to that selection.

Vehicle / chassis code

Choose an exact vehicle

03 / Choose what you observed

Electrical

Keep the 12V battery, charging system and key recognition separate.

No-start / no electrical powerRecord what the dashboard and starter or READY system actually do.Guided checks Key not recognizedCheck the exact vehicle key and 12V references before replacing anything.Guided checks Battery / charging warningA charging warning does not prove the battery itself failed.Warning guidance

04 / Next safe action

Key not recognized

Follow the existing observation-based checks for this symptom. Results are not confirmation that a component has failed.

Continue to guided checks ↓

Considering a 12V battery replacement?

A no-start alone does not prove the battery failed. Record the symptom and check the exact model's battery and charging references before purchasing. Our US guide explains 12V part costs, itemized installation quotes and battery-versus-alternator testing; it does not price or instruct work on high-voltage traction systems.

Read the 12V battery replacement and diagnosis guide →

Choose an exact vehicle to unlock the exact-chassis flow. Until then, Diagnostics v3 uses the generic safety/observation path for this symptom.

Diagnostics v3 · Structured symptom flow

Won't start / hard starting — structured test-result path

0 results recorded

Next reachable check

Do the dashboard and interior electrical systems power on normally?

This separates a broad low-voltage/power symptom from a vehicle that has normal accessory power.

Mechanic handoff summary

Further evidence required. 0 reachable results recorded.

Choose an exact vehicle above before copying, printing or saving a handoff.

Results stay on this page until you leave or change vehicle/symptom. Optional saving stores only this v3 session on this browser, separate from Garage and Vehicle Passport. It is not uploaded or shared. References are refreshed from CarFactBook when you return.

Preparing Diagnostics v3 handoff…

After a mechanic checks or repairs the car

Close the loop with the actual diagnosis, repair, part, cost and follow-up. The exact vehicle, symptom area and the test-result path above are prefilled, but you can edit them before submitting.

Choose an exact vehicle above to prepare a repair-outcome report.Reports remain pending until CarFactBook reviews them. A diagnostic path or external test result never becomes a confirmed diagnosis automatically.

Choose an exact vehicle above to see its verified facts, guides, maintenance and parts references.

Reviewed repair evidence

Won't start / hard starting

0 related reports

Reports are matched by related system category across vehicles. Compare the recorded symptom and outcome; a repair on another car does not diagnose yours.

No reviewed match yet. CarFactBook will not manufacture a likely cause just to fill this screen. Check the exact vehicle facts or contribute a real repair outcome through Problems.

Immediate owner decisions

Urgent symptoms: fluid leaks, tire problems and warnings

A tire blowout, low oil pressure, slipping transmission or overheating can require an immediate safe stop. Choose the relevant owner-safety research before starting vehicle-specific diagnosis.

Tires · NHTSA guidance