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EnginePart report

2004 Toyota Prius Engine Problems

Complaints
9about this part
Share
1%of 610 total for the year
Median mileage
105,675miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 9 complaints about the engine of the 2004 Toyota Prius, 1% of the 610 complaints for this model year. Where a mileage was given, the median is 105,675 miles.

Fewer than 15 complaints name this part, so treat the figures as a rough indication only.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“This occurred to me yesterday while traveling 60 MPH in 94 f heat on I-76 e just before the 676 / 76 split. I was traveling in the far left lane when the car suddenly lost power. Looking at the dash I noticed the shifter had moved itself into n (neutral), it would not move back into drive. I applied my hazard lights and began forced my way rightward across three lanes to the shoulder, speed rapidly decreasing and seemingly more sluggishly than a normal coast. I think the emergency brake was automatically being applied or I was fighting a braking system. …”

NHTSA complaint #11111093, filed 2018-07, 184,000 miles

“My 24 yr. Old child was driving out of a driveway at 5 MPH when the car stopped and all warning lights including brakes and engine and triangle went on. It would not restart. It would not take a battery jump. Had it towed to Toyota service and they discovered code p0335 present and verified a faulty crankshaft position sensor, replaced it, and cleaned throttle body. The car works now. Cost for diagnosis and service was $367.07. This faulty part was a part of a recall dated in 2006 for 2001 and 2002 priuses. …”

NHTSA complaint #10482058, filed 2012-10, 92,521 miles

“Every time I get an oil change I make sure that the right amount of oil gets put in the engine. I usually get an oil change every 3000 miles regardless of what the oil manufacturers recommend which is usually 5-7 thousands miles. For the past year I started noticing (usually by the oil service tech) that more and more I'm running low on oil. It started out with a half to one quart of oil missing between oil changes to now 2-3 quarts missing between oil changes. …”

NHTSA complaint #11048149, filed 2017-11

“The contact owns a 2004 Toyota Prius. While driving 45 MPH, the hybrid system, stability control, check engine, and srs warning indicators illuminated. The vehicle was taken to an independent Toyota mechanic who informed the contact that the vehicle needed a new hybrid coolant pump and water pump. The vehicle was not repaired. The dealer was not contacted. The manufacturer was notified and did not assist. The failure mileage was 83,772.”

NHTSA complaint #11083423, filed 2018-04, 83,772 miles

“The contact owns a 2004 Toyota Prius. The contact stated while driving approximately 30 MPH, the vehicle stalled. The vehicle lost power steering functionality but the contact was able to safely pull off of the road. The contact stated that the check engine warning light and other unknown warning lights were illuminated before the vehicle stalled. Additionally, the instrument panel went black. The contact stated that she attempted to restart the vehicle but the vehicle would not restart. The contact had the vehicle towed to her residence and later towed to an independent mechanic. …”

NHTSA complaint #11460805, filed 2022-04, 83,200 miles

Related service bulletins

Engine: other model years

YearComplaintsShare of year
202228%
2021233%
202017%
2019620%
201838%
20171213%
20161711%
201585%
2014178%
2013379%
2012317%
2011479%
20101405%
2009194%
2008493%
2007372%
2006252%
2005151%
200491%
200121%

Other parts of the 2004 Toyota Prius

Exterior lighting
184 complaints
Electrical system
177 complaints
Engine cooling
89 complaints
Brakes
76 complaints
Vehicle speed control
52 complaints
Transmission and drivetrain
34 complaints
Air bags
18 complaints
Other or unknown
18 complaints
Fuel system
13 complaints
Steering
10 complaints
Visibility (wipers, defrost, mirrors)
10 complaints
Electronic stability control
8 complaints

← All problems reported for the 2004 Toyota Prius

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology