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

0/2 checked
Check 1

Is the warning red, flashing, or accompanied by abnormal vehicle behavior?

Warning severity and vehicle behavior determine whether continued driving may be inappropriate.

Check 2

Is a diagnostic trouble code available?

An exact code is a stronger starting point than the warning lamp alone.

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 2 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

Brake fluid specification →

Toyota Brake Fluid 2500H

Use fluid meeting the exact Toyota specification and follow the proper hybrid brake service procedure.

Toyota Motor Corporation · Verified 2026-10-02

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

Hybrid traction battery architecture →

Nickel-metal hydride · 28 units · 6.5 Ah

High-voltage traction battery; do not confuse with the auxiliary 12V battery.

Toyota Motor Corporation · Verified 2026-10-02

Hybrid traction motor →

3JM AC synchronous permanent-magnet motor

High-voltage traction motor; separate from the gasoline engine and 12V system.

Toyota Motor Corporation · Verified 2026-10-02

Hybrid transaxle fluid →

Toyota ATF WS · 3.4 L

Toyota labels the capacity as a reference value and advises proper service procedures for fluid replacement.

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

Smart key battery →

CR1632

Applies to the cited ZVW30 owner-manual period; confirm the key type if the vehicle uses a replacement or non-original key.

Toyota Motor Corporation · Verified 2026-10-05

Step-by-step guides

How to Replace a Toyota Prius ZVW30 Smart-Key Battery →

Replace the ZVW30 Prius smart-key battery using Toyota's manufacturer-backed CR1632 reference.

Easy · 5 minutes

This guide is for the smart-key configuration covered by the ZVW30 source. Verify the key type if your housing differs.

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

Hybrid transaxle fluid service reference

Condition based

Use Toyota ATF WS for the ZVW30 hybrid transmission; the cited manual lists 3.4 L as a reference capacity.

No replacement interval is inferred from the specification table; follow the correct Toyota service procedure.

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

Brake-fluid service reference

Condition based

Use Toyota Brake Fluid 2500H as specified for the cited ZVW30 owner-manual period.

No replacement interval is inferred from the specification table; hybrid brake servicing requires the correct procedure.

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

Smart key battery replacement

Condition based

Use a CR1632 battery for the documented ZVW30 smart key.

Replace when required; no time or distance interval is inferred.

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.

Smart key battery

CR1632

Toyota’s ZVW30 owner manual specifies CR1632 for the electronic key. Confirm the key is original and matches the cited production-period design.

Toyota Motor Corporation source ↗ · Verified 2026-10-01

Smart key battery

CR1632

Applies to the cited ZVW30 owner-manual period; confirm the key type if the vehicle uses a replacement or non-original key.

Toyota Motor Corporation source ↗ · Verified 2026-10-01

Brake architecture — 2011 L

Ventilated disc front · disc rear

Exact to the cited 2011 L configuration; confirm rotor/caliper specification before ordering.

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

3JM traction motor architecture

3JM AC synchronous permanent-magnet motor · 60 kW · 207 N·m

High-voltage traction system reference, not a DIY replacement instruction.

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

Hybrid traction-battery architecture

Nickel-metal hydride · 28 units · 6.5 Ah

High-voltage traction battery; separate from the auxiliary 12V battery. Service requires appropriate high-voltage procedures.

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

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

Hybrid transaxle fluid

Toyota ATF WS · 3.4 L

ZVW30 owner-manual transmission-fluid reference; capacity is a service reference, not a drain-and-fill guarantee.

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

Warning light or message

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 →