Which parts fail
Components named in complaints (battery, alternator, wiring, ignition, instrument cluster, infotainment).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2008 Toyota Avalon owners, lightly cleaned up (personal details are redacted by NHTSA).
OEM high beam bulbs continuously explode. I'm not saying they just burn out, these bulbs shatter, and send shards of glass on the inside of the headlamp housing. I believe it's a big safety risk, because for me, it happened while I was driving late at night in the dark where there are deer nearby. Brights are essential to see far and when you're driving through hills, going up a hill you need your brights to extend higher than your normal lights do. This is a commonly complained about problem for the 2008-2010 models of this Toyota Avalon. Toyota has issued a technical service bulletin back in 2011, but it is a major defect and I believe it should be fixed regardless of whether a customer pays for a warranty or not. A mechanic told me also that they are not sure why Toyota has not warrantied vehicles with this issue. The solution is replacing the headlight housing. …
While driving down a two lane country highway at night with my bright lights on, I hit a bump and the bright lights simultaneouslywent off. Fortunately, my low beams then came on. I tried several different things including flicking the lights, stopping the car and turning the lights off/on. The brights no longer work. I did check to see if they exploded as reported by many others in this database, but they do not appear to have. They just do not work. Living in a very rural area of northern wisconsin, bright lights are a necessity. I called the dealer who services my car and they pleaded ignorance with regard to know problems with the headlights on this vehicle. They suggest I bring the car in to replace the bulbs. I will attempt to replace the bulbs myself before I will pay for the assembly mentioned in the many other complaints. …
I put on my brights while driving at night, on a dark part of the interstate. After a while they went out... Immediately and simultaneously. The left hand side stalk controls the headlights ("on" and "auto-on" positions), and brights. Notably the brights are a separate bulb. The "auto-on" (if it gets dark) was the setting for which they went out. I pulled over at an exit, tried the brights again after turning off my headlights and putting them to the "on" setting (as opposed to "auto-on"), and the brights did not work and actually turned off my regular headlights. This is dangerous. I see it is not the first time this problem has been reported. I found Toyota had a quiet, unannounced service upgrade for faulty design, did not advertise it, recall it, or send a warning note or offer to fix to owners, and arbitrarily set the limitation at 5 yrs / 72,000 miles. …
The high beam lights are known to explode on some 2008 and 2010 models. My high beam lights exploded with 66,000 miles on the vehicle. This problem happened while my vehicle was in motion. I routinely drive in an area with a heavy deer population. I cannot see these hazards at night with out high beams. Toyota had an extended warranty on this issue (5 years, 70,000 miles). Since my car is over warranty in years but not miles, Toyota refuses to replace the headlight assemblies. They are telling me the cost will be over $2,000. I consider this a safety hazard and am very upset that Toyota will not fix this problem on my $40,000 top of the line Toyota. I am filing this complaint to the dot, ntsb, and attorney general. You can contact me at [redacted].
I have been pulled over numerous times due to having a headlight out. However it's never blown. Once I show the officer by turning the lights off for a few seconds then back on the light is on. From reading many Toyota forums and going to a Toyota dealer, it is a faulty wiring system and to repair it will cost at least $1300.00 or more. It is a hastle as well as a safety hazard. The light doesnt stay on once turning the lights off then on. Within a few miles it goes off again and it is constantly blowing the light bulbs. In the 3 years I have had my car I have replaced the lights at least 7 times. The light will always be off when I start my car with the remote starter and when I start it with the ignition if it's on, within a few miles of driving it goes off again.
From the day I purchased used vehicle in 2015, I've experienced headlights that flicker and go off only to be fully illuminated by turning off then back on. Mostly, it's the driver side and sometimes the passenger side; infrequently, both headlights are affected. I've searched the internet for a solution and found hundreds of similar reports with 'solutions' ranging from simple few dollars to above $1000. My local dealer had the car on several different occasions...to no avail and was willing to 'fix' it for $1200. Because of the number of similarly described on internet forums, I think that Toyota should recall the vehicles if, for no other reason, than that this is a significant safety issue.
All of a sudden the high-beam head lights stopped working when the car was in motion on the freeway. Low -beam lights work. This is a real safety hazard and is obviously a Toyota engineering flaw. Toyota did have a warranty enhancement for this vehicle - 75,000 miles or 5 years, whichever comes first. My car has 52,000 miles buts is over 5 years old. Toyota is well aware of this problem and should be required to fix this, free of charge and I should not be required to pay for the fix of $2,500 plus labor, which is outrageous.
All of a sudden the high-beam head lights stopped working when the car was in motion on the freeway. Low -beam lights work. This is a real safety hazard and is obviously a Toyota engineering flaw. Toyota did have a warranty enhancement for this vehicle - 75,000 miles or 5 years, whichever comes first. My car has 52,000 miles buts is over 5 years old. Toyota is well aware of this problem and should be required to fix this, free of charge and I should not be required to pay for the fix of $2,500 plus labor, which is outrageous.
Rear sun shed break very fast makes a lot of noise. It can't be disabled without causing other problem such as engine light on and cruz control disabled and all kind of sensors that need to be replaced. Its very dangers and frustrating
I owned a 2008 avolan. It caught fire dec. 7 2009 and burned up. I thought I needed to report this to someone. I don't want this to happen to someone else, and the result could be death. I got hurt bad but I am better now.
Electrical complaints in other Avalon years
Frequently asked questions
How common are electrical problems on the 2008 Toyota Avalon?
NHTSA has 44 complaints about the electrical system of the 2008 Toyota Avalon, 13% of the model year's 349 complaints. The component named most often is ignition (1 mentions).
Is there a recall for 2008 Toyota Avalon electrical problems?
No. NHTSA lists no electrical system recall for the 2008 Toyota Avalon, though it has 6 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2008 Toyota Avalon electrical problems start?
Half of the complaints with a recorded mileage happened before about 56,000 miles, and 10% before 25,000 miles.
Is it dangerous?
Owners linked 1 crash, 2 fires and 1 injury to electrical system problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.