hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
95,799 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2004 Toyota Prius engine problems

engine problem

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2004 Toyota Prius Owner Comments

problem #4

Nov 292015


  • miles


Coolant control valve is failing on many Prius's which were made between 2004 to 2009

- Bridgeport, CT, USA

problem #3

Aug 192015


  • 105,675 miles
Warning triangle and check engine lights came on while traveling. Took vehicle to independent mechanic, who diagnosed hybrid water pump malfunction; he noted a recall, so I took vehicle to dealer. Dealer charges $130 to plug into diagnostic system, finds same problem; wants $750 to replace. Pump was replaced @ 30,000 miles ago under aon recall. Multiple reports on web about the same replacement part failing after short time.

- Arlington, VA, USA

problem #2

Dec 232011


  • 185,000 miles
The contact owns a 2004 Toyota Prius hybrid. The contact stated that hot and cold air was being emitted from the ventilation system when neither the air conditioning unit nor the heater was activated. Additionally, the wrench warning light illuminated immediately after the failure. The vehicle was later towed to a dealer for diagnosis where they advised him that the water pump failed and needed to be replaced. The vehicle was repaired for the water pump. The manufacturer was contacted and confirmed that the vehicle was included in NHTSA campaign id number 12V536000 (engine and engine cooling). The vehicle was serviced per the recall however, the failure recurred one year later. The vehicle was not inspected by a dealer or an independent mechanic. The manufacturer was later contacted and advised him that the dealer could have previously replaced the water pump with a defective one. The vehicle was not further repaired. The failure mileage was approximately 185,000. The current mileage was approximately 194,000.

- Memphis, TN, USA

problem #1

Oct 202012

Prius 4-cyl

  • 92,521 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. We wish to advise the Agency that we believe the year 2004 and perhaps other years ought to be considered for the same recall as the 2001 and 2002 Prius models with respect to a faulty crankshaft position sensor. We believe our car had a faulty sensor and that we should be a part of the earlier recall, and also obtain a full reimbursement for charges. This sudden stopping by the vehicle poses a very dangerous situation for any driver. Our child would have been on a major highway just a few minutes later and could have been the victim of a horrendous accident. We urge your Agency to be proactive in investigating this matter. Thank you.

- Milton, MA, USA

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