CarFactBook Diagnostics V2.3

Start with what the car is doing.

Choose a symptom and, when possible, an exact vehicle code. Work through structured observations first, then compare them with reviewed owner evidence. CarFactBook does not invent a diagnosis or rank a failed part from unsupported anecdotes.

Symptom first

What are you seeing?

Electrical

Won't start / hard starting

Check reviewed reports for Toyota Prius ZVW30.

Electrical

Warning light or message

Check reviewed reports for Toyota Prius ZVW30.

Cooling

Overheating / running hot

Check reviewed reports for Toyota Prius ZVW30.

A/C / climate

A/C not cold

Check reviewed reports for Toyota Prius ZVW30.

Suspension / steering

Vibration / shaking

Check reviewed reports for Toyota Prius ZVW30.

Brakes

Brake problem

Check reviewed reports for Toyota Prius ZVW30.

Hybrid / EV system

Hybrid-system problem

Check reviewed reports for Toyota Prius ZVW30.

Fuel / emissions

Poor fuel economy

Check reviewed reports for Toyota Prius ZVW30.

Choose an exact vehicle

Selected: Toyota Prius ZVW30 · 2009–2015

Structured checks

Work through observations, not guesses

0/3 checked
Safety first. If the temperature warning is severe, steam is visible, or coolant is escaping, stop driving and follow the vehicle manufacturer's safety guidance. Do not open a hot pressurized cooling system.
Check 1

Is the vehicle currently showing a high-temperature warning, steam, or coolant loss?

An active overheating event can require stopping rather than continuing a diagnostic drive.

Check 2

When safely cold, is there visible evidence of coolant loss or leakage?

Visible loss is evidence worth recording before considering component causes.

Check 3

Does the temperature symptom repeat under the same conditions?

Repeatable operating conditions help distinguish a pattern from a one-off observation.

These checks organize observations and safety decisions. They are not a substitute for manufacturer service procedures or a qualified diagnosis, and CarFactBook does not assign a failed part without supporting evidence.

Diagnostic summary

Further evidence required. 0 of 3 observations recorded.

Answers stay on this page until you leave or change vehicle/symptom. Optional saving stores only this session on this browser, separate from Garage and Vehicle Passport. It is not uploaded or shared. Restore explicitly after returning to the same selection; references are refreshed from CarFactBook.

Preparing session summary…

After a mechanic checks the car

Close the loop with the actual diagnosis, repair, part, cost and outcome. The exact vehicle, symptom area and your diagnostic observations 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 session does not become a confirmed diagnosis automatically.
Toyota Prius ZVW30

Useful references for your exact car

These references relate to the selected symptom. They do not identify a faulty component or recommend replacing it. Confirm equipment, production period and source caveats for your individual car.

Verified facts

Engine coolant capacity →

Toyota Super Long Life Coolant · 7.2 L

Capacity is a reference value; confirm the exact production period, service procedure and final level.

Toyota Motor Corporation · Verified 2026-10-02

Power control unit coolant capacity →

Toyota Super Long Life Coolant · 2.1 L

This is the hybrid power-control cooling circuit, not the gasoline-engine cooling circuit.

Toyota Motor Corporation · Verified 2026-10-02

Maintenance

Documented service references; your service history determines what is due.

Engine coolant service reference

Condition based

Use Toyota Super Long Life Coolant for the gasoline-engine circuit; the cited manual lists 7.2 L.

No coolant replacement interval is inferred from the capacity table.

Toyota Japan Prius 2010 owner manual ↗ · Verified 2026-10-02

Power control unit coolant service reference

Condition based

Use Toyota Super Long Life Coolant for the power-control-unit circuit; the cited manual lists 2.1 L.

This is a separate hybrid cooling circuit. No replacement interval is inferred from the capacity table.

Toyota Japan Prius 2010 owner manual ↗ · Verified 2026-10-02

Full exact-car maintenance schedule →

Parts / fitment

Reference specifications, not a shopping list or proof that these parts need replacement. Fitment conditions still apply.

Engine coolant

Toyota Super Long Life Coolant · 7.2 L engine circuit

ZVW30 owner-manual reference for the gasoline-engine cooling circuit.

Toyota Motor Corporation source ↗ · Verified 2026-10-02

Power control unit coolant

Toyota Super Long Life Coolant · 2.1 L power-control circuit

Hybrid power-control cooling circuit; keep separate from the engine cooling circuit.

Toyota Motor Corporation source ↗ · Verified 2026-10-02

Full exact-car parts references →

Reviewed repair evidence

Overheating / running hot

0 related reports

Reports are matched by related system category for Toyota Prius ZVW30. 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.

Browse or contribute reviewed problem & repair evidence →