2004 Toyota Sienna engine problems

Filed Nov 17, 2025 · Engine · 150,132 miles · PA

The contact's mother owns a 2004 Toyota Sienna. While the contact's mother was driving at an undisclosed speed, several unknown warning lights illuminated. The contact stated that the warning lights illuminated on and off for days and months. The vehicle was taken to an independent mechanic where DTC: P2241 was retrieved. The vehicle was not repaired. The contact was advised to take the vehicle to the dealer. The vehicle was taken to the dealer where the failure code was confirmed. The contact was informed that the oxygen sensors needed to be replaced. In addition, the contact was informed that a TSB for the ECM software update needed to be performed. The contact stated that the vehicle was not repaired because the ECM software update was performed, and the ECM software update damaged the ECM. The manufacturer was made aware of the failure and a case was filed. The failure mileage was approximately 150,132.

Filed Jul 11, 2021 · Engine, Fuel system · CA

Unknown

Filed Feb 27, 2019 · Engine · 168,000 miles · FL

I have a problem at shift solenoid e make my car jump and not safe when park

Filed Oct 19, 2018 · Driver assistance, Engine · GA

Knock sensor and vsc are malefunctioning.

Filed Oct 19, 2016 · Engine · 96,321 miles · HI

Tl* the contact owns a 2004 toyota sienna. While driving approximately 55 MPH, the contact heard a loud noise and lost steering control. The vehicle was pulled over to the side of the road and towed to the contact's residence. The vehicle was later taken to an independent mechanic where it was diagnosed that the crankshaft pulley failed and needed to be replaced. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was 96,321.

Filed Nov 4, 2015 · Engine · 37,447 miles · MD

When negotiating moving into traffic at slow speeds, when a small amount of accelerator movement is made the vehicle rapidly accelerates making it necessary to quickly apply the brakes to avoid collision. The vehicle was purchased used from a dealer and there was a recall bulletin (tech service bulletin issued 11/7/2003 for 04-05 sienna bulletin no tc007-03 out on the engine control module. When pointed out to the dealer they simply stated that that recall was only available to the original purchaser and then only if reported within the first three months after purchase. Was told by two dealers that the recall did not apply to our vehicle and later that a recall was not issued for that problem. ( I have a copy of the origional recall notice stating the above problem)

Filed Apr 25, 2015 · Engine, Transmission · 121,482 miles · NJ

Radiator failure resulting in coolant leakage in the transmission fluid and transmission is failing. I noticed my 2004 toyota sienna had some belt noise that got worse. The van was due for a water pump/timing belt change. Later the engine temperature gauge read high and after checking the fluids noticed the antifreeze level to be low and topped it up. A week later while driving on the highway steam started coming out of the hood. I noticed the pink fluid had also leaked out of a tube (looked like a relief tube) on the driver side. Radiator level was low. The transmission fuel looked pinkish and read about six inches above the max level on the dipstick. Trans fluid was milky pink, thick, and had grainy deposit. Took the van to the autoland dealer in springfield, nj to diagnose the problem and to have the water pump and timing belt change at the same time. Had to leave the van overnight. I picked up the vehicle with a nearly $2000 bill for repairs (brakes, tire rotation, timing belt and water pump) other than changing the trans. Fluid or telling me what was wrong. Dealer said someone put additive to the fluid???. Note that only autoland had been servicing the vehicle. They refused to change the trans fluid. "I am not touching that." the dealer said. I now know from a local trans repair shop that the radiator was leaking coolant into the trans fluid. A known problem with radiators on toyota vehicles that had a recall. I never received notice of the recall. I now have an estimated $4,000 problem to replace the radiator and transmission that could have been prevented if autoland had done its job properly and not refused to change the trans. Fluid. I am very disappointed with toyota and with autoland's service.

Filed Feb 19, 2015 · Acceleration, Brakes · 120 miles · NJ

The outside temperature was below 32 and it was close to 25 or so. When I was driving the car at 40 MPH with engine temp still slightly above cold(not at optimal which is almost half way) and slowed down by using gentle brakes(not hard brakes). Just before the vehicle comes to a full stop, there is unintended acceleration and I could see even the RPM(scale) to spike temporarily. This has been happening every time when outside temp is cold and vehicle is driven with cold or slightly above cold engine temperature. There is a risk of hitting another vehicle or meeting accident if misjudge my braking because of this problem.. Please note : this problem disappears when engine temperate is at optimal and I have driving a honda accord 2008 exl for last 7 years(was bought new one), I never had experienced this problem in that car even when driven with cold engine.

Filed Jul 9, 2014 · Engine · 70,010 miles · SD

Fan belt started squealing upon engine start, took to dealer and replaced serpentine belt. Several months later groaning noise started coming from engine, suspected misaligned belt or bad pulley. Took vehicle to the dealer and they found wear on the exterior of the timing belt cover caused by the partial separation of the crankshaft pulley. Several reports online of owners experiencing this problem with toyotas. Checked with dealer and toyota customer service and they claim my VIN is not covered by the recall they issued in 2011 for the very same failure I am experiencing (11v539000). How is it possible that a known defect in their vehicles can be excluded because their experts have made the determination that the "cause" was a problem at one factory or part supplier when other owners that don't fall into the specific parameters have had the very same problem and were forced to pay for repairs out of pocket?

Filed Mar 19, 2014 · Acceleration, Engine · 129,000 miles · MI

Complete loss of power while in motion entering freeway. Previously had noticed steering difficulty at times and engine light going on, but had always stopped after a short while. After the failure it was diagnosed as failure of crank shaft pulley. We found that toyota had done a recall for this issue, but had not included our vehicle in the recall or notified us. Toyota denied coverage of the required repair. Driver and two small children in care at time of failure, just about to enter freeway. Over $800 in repairs.