2004 Toyota Prius Engine And Engine Cooling Problems

NHTSA component category: ENGINE AND ENGINE COOLING · data through 07/14/2026

45Engine And Engine Cooling complaints

7.4%Of all 610 complaints

#4Most-reported category

Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.

How engine and engine cooling ranks on this vehicle

EXTERIOR LIGHTING164 · 26.9%

ELECTRICAL SYSTEM153 · 25.1%

VEHICLE SPEED CONTROL48 · 7.9%

ENGINE AND ENGINE COOLING45 · 7.4%

ENGINE AND ENGINE COOLING:ENGINE29 · 4.8%

Share of the 610 complaints citing each category; one complaint can cite several. Full breakdown on the 2004 Toyota Prius overview page.

What owners report

“DT: WHILE DRIVING AT A STEADY PACE, THE VEHICLE STALLED.”NHTSA complaint 10124826 — filed 07/15/2005

“CONSUMER STATED WHILE TRAVELING 40 MPH ALL OF A SUDDEN , THE LIGHTS ILLUMINATED ON THE DASHBOARD AND THEN EVERYTHING SHUT OFF. THE CONSUMER HAD…”NHTSA complaint 10121438 — filed 06/20/2005

“I OWN A 2004 TOYOTA PRIUS, 15680 MILES. THE ENGINE STOPPED WHEN I WAS DRIVING AT ABOUT 60 MPH AND ALL WARNING LIGHTS CAME ON…”NHTSA complaint 10124470 — filed 06/07/2005

Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.

Engine And Engine Cooling complaints by year filed

Frequently asked questions

Does the 2004 Toyota Prius have engine and engine cooling problems?

Engine And Engine Cooling is the #4 most-reported problem area on the 2004 Toyota Prius: 45 of 610 complaints on file (7.4%). Complaints are unverified owner reports, not confirmed defects.

How many complaints does the 2004 Toyota Prius have in total?

610 complaints were on file with NHTSA as of 07/14/2026. Across all categories, 38 involved a crash, 2 involved a fire, 29 reported injuries, and none reported deaths.

What does NHTSA's engine and engine cooling category include?

NHTSA assigns each complaint to standard component categories; this page reports the ENGINE AND ENGINE COOLING category exactly as NHTSA defines and records it.

About this data — Complaint figures on this page are consumer reports submitted to the National Highway Traffic Safety Administration (NHTSA), a U.S. government agency. NHTSA does not verify individual complaints; a complaint is not proof that a defect exists, and counts reflect what owners chose to report, not confirmed failure rates. Recall information comes from official NHTSA safety recall campaigns; recall repairs are free at authorized dealers. Always check your specific vehicle by VIN at nhtsa.gov/recalls. CarModelProblems.com is an independent site and is not affiliated with NHTSA or any vehicle manufacturer. Data through 07/14/2026.