Toyota Sienna Alternator Repair at your home or office.

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Average rating from customers who
received a Alternator Replacement.
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$261.97 - $590.91

Price range for all vehicles


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Average rating from customers who
received a Alternator Replacement.
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Alternator Repair Estimate for Toyota Sienna

Toyota Sienna Alternator Repair costs $362 on average.

CarServiceEstimateShop/Dealer Price
2004 Toyota SiennaV6-3.3LService typeAlternator RepairEstimate$458.95Shop/Dealer Price$568.32 - $866.33
2011 Toyota SiennaL4-2.7LService typeAlternator RepairEstimate$559.25Shop/Dealer Price$693.76 - $1067.03
2003 Toyota SiennaV6-3.0LService typeAlternator RepairEstimate$551.93Shop/Dealer Price$682.64 - $1046.13
2006 Toyota SiennaV6-3.3LService typeAlternator RepairEstimate$463.95Shop/Dealer Price$573.87 - $872.29
2000 Toyota SiennaV6-3.0LService typeAlternator RepairEstimate$546.93Shop/Dealer Price$680.04 - $1045.33
2013 Toyota SiennaV6-3.5LService typeAlternator RepairEstimate$709.14Shop/Dealer Price$871.41 - $1294.98
2005 Toyota SiennaV6-3.3LService typeAlternator RepairEstimate$458.95Shop/Dealer Price$565.23 - $860.91
2010 Toyota SiennaV6-3.5LService typeAlternator RepairEstimate$739.13Shop/Dealer Price$907.87 - $1336.30
Show example Toyota Sienna Alternator Repair prices

Service

What is an alternator and how does it work?

The alternator, which is bolted to the engine, keeps your car’s battery charged and produces the electrical power necessary to run the vehicle’s electrical systems. When starting your car, stored energy in the battery powers the starter motor. Once the engine is running, the alternator produces the electrical energy that your car needs by spinning a magnet on a rotor through a stationary coil of wire. To ensure that the alternator provides the right voltage output for your car’s electrical system, there is a voltage regulator built into the alternator. The voltage regulation is built into the car’s Powertrain Control Module (PCM) on newer vehicles.

Alternator

When to replace the alternator?

The following electrical or mechanical faults are signs that the alternator may need to be replaced:

  • Battery or charging system warning light. If a warning light has illuminated, the charging system and the vehicle battery should be tested to pinpoint the fault.
  • Difficulty starting your car or it doesn’t start. A faulty alternator will lead to the battery being discharged. Once the battery has discharged enough, you will have difficulty starting your car or it won’t start at all.
  • Dimming lights. Should the alternator have an internal electrical fault, such as a burned-out diode or open stator windings, the alternator will have less capacity to provide electrical power.
  • Grinding or whining noise. High heat created by the engine dries out the grease in the alternator bearings, wear occurs, and then the alternator can emit a grinding or whining noise as it spins. Certain electrical failures within an alternator can also cause a whining noise.
  • Premature Battery Failure. If the voltage regulator within the alternator has failed, and thus charging system output is too high, that can cause the battery to fail due to overcharging. Although this fault is not as common as a weak alternator, the possibility should always be considered if your car battery fails prematurely.
  • On an annual basis, or every 12,000 miles. The voltage output of the alternator should be carefully measured and compared to the OEM factory specification. Voltage output should also be checked whenever the vehicle battery is replaced.

How do mechanics replace an alternator?

  • Disconnect the battery prior to replacing the alternator, as with all electrical repairs.
  • Unhook the drive belt connected to the alternator.
  • The electrical connections to the alternator are removed and the alternator is unbolted from its cradle on the engine.
  • The new alternator is installed while observing all factory bolt torque specifications. Alternators have to be mounted to the engine very securely because they rotate at high speed. Electrical connections are cleaned and re-attached, including the connections to the battery.
  • While the drive belt is off, best practice is to inspect the drive belt as well as inspect all pulleys driven by the belt.
  • Once all components are securely in place, the vehicle engine is run and the output of the new alternator is measured and verified against the OEM factory specification.

Is it safe to drive with an alternator problem?

One should exercise caution. Should the alternator fail while you are driving, the battery alone will power the car’s electrical system for a short while. Cars require a substantial amount of electrical power though and the battery will likely discharge relatively quickly. The car may stall and it would be impossible to re-start if the battery discharged completely. When the battery or charging system warning light illuminates, the situation should be investigated and resolved as soon as possible.

When replacing the alternator keep in mind:

  • An alternator should always be tested to be sure it is actually faulty versus a circumstance where faulty electrical connections, or an open fuse, might be the problem.
  • An alternator that has noisy or worn out bearings should be replaced regardless of electrical test results.
  • A properly functioning battery is very important in modern cars and consequently the battery should be load tested when the alternator is replaced.
  • Alternators are designed to power all vehicle electronics and maintain a fully charged battery but if the battery has failed and won’t hold a charge, attempting to continually re-charge such a battery by driving can overload the alternator. Replace the battery and avoid repeatedly jump-starting your car.
  • Electrical connections, including grounds, are very important in the charging system. When replacing the alternator, all disconnected terminals should be inspected and cleaned and then checked to be sure all connections are properly tightened.

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Meet some of our expert Toyota mechanics

Real customer reviews from Toyota owners like you.

Excellent Rating


YourMechanic Toyota Sienna Alternator Replacement Service

Average Rating

4.6/5

Number of Reviews

17

Rating Summary
14
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Juan

7 years of experience
133 reviews
Juan
7 years of experience
Great service.. found out i didnt have to replace alternator. Very knowledgeable!
2004 TOYOTA SIENNA - ALTERNATOR - LA HABRA, CALIFORNIA

Hector

11 years of experience
59 reviews
Hector
11 years of experience
Once again Hector was outstanding. Early arrival, quick diagnosis, and his knowledge lead to very quick repair. Wish I would have called him sooner, but absolutely certain I will call him for all my repairs in the future. Your mechanic service is my new source for all repair work on my Sienna and Malibu. Thanks
1998 TOYOTA SIENNA - ALTERNATOR - DENVER, COLORADO

Fernando

24 years of experience
10 reviews
Fernando
24 years of experience
I couldn't have asked for better. He was here in perfect timing, ready to work, helped me with issues, and did an excellent job. Happy I went with your mechanic due to pricing and quality of service. And Fernando would be preferable if I have any other car issues.
2004 TOYOTA SIENNA - ALTERNATOR - SAN ANTONIO, TEXAS

Joseph

17 years of experience
285 reviews
Joseph
17 years of experience
Let me know in advance of a short delay. Got the job done a little faster than estimated. Everything working so far.
2001 TOYOTA SIENNA - ALTERNATOR REPAIR - KAYSVILLE, UTAH

Excellent Rating


YourMechanic Toyota Sienna Alternator Replacement Service

Average Rating

4.6/5

Number of Reviews

17

Rating Summary
14
1
1
1
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14
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Red-stars EXCELLENT RATING ON
Number of Toyota Sienna Alternator Replacement services completed
187+
services done by our mechanics
TOTAL NUMBER OF EXPERT Toyota MECHANICS
1100+
experts on our platform

How can we help?

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