Is my RAV4 Hybrid battery going bad? P0A80, the cooling filter, and checking it yourself

Quick picks

What each RAV4 hybrid battery warning means

So the RAV4 shows a few different hybrid battery messages on the gauge screen, and each one asks you to do something different. Here's what Toyota's owner's manuals say about each message.

Basically, "traction battery" is just Toyota's name for the big hybrid battery that drives the wheels, not the small 12-volt battery. And keep in mind that a lot of people search for "Check Hybrid System." But on a 2019 to 2026 RAV4, the message actually reads "Hybrid System Malfunction." I explain the rest of the RAV4's lights and messages on my RAV4 warning lights page.

What P0A80 really means on a RAV4 Hybrid

So a fault code is a short code the car's computer saves when something goes wrong, and a scanner or a dealer reads the code. Toyota's repair manual names P0A80 "Replace Hybrid Battery Pack." On newer Toyotas it shows with an extra number, like P0A80-123. And its partner code, P0A7F, is "Hybrid/EV Battery Pack Deterioration."

How the car decides to set P0A80

Basically, the hybrid battery is made of lots of small cells, and the battery computer watches the voltage of each group of cells. Toyota calls each group a "block," and a block is usually two battery modules. Toyota's repair manual for the Prius says P0A80 sets when the gap between the strongest and weakest blocks gets bigger than Toyota's limit.

• P0A80 needs two drives to set. The computer has to see the gap on two separate drives before it stores the code.
• Clearing P0A80 doesn't fix the battery. After the code is cleared, the car needs about 10 minutes of driving before it finishes checking the battery again.
• Toyota doesn't publish the RAV4's limit. Forum posts give a few different numbers for different Prius years, and the numbers don't agree. None of them is a RAV4 number.
• The cells aren't the only possible cause. Toyota's Prius repair manual lists two trouble areas for P0A80: the battery itself and the battery's voltage sensor board. On Prius and Camry forums, owners also say to check the 12-volt battery and the cooling fan before paying for a battery.

Toyota's bulletin T-SB-0074-20, and why the filter matters

Now this is the part that matters most for an owner. Basically, a service bulletin is a set of repair instructions Toyota sends to its dealers. Toyota service bulletin T-SB-0074-20, from August 5, 2020, says dust or debris in the hybrid battery's cooling fan or filter can set P0A80 and P0A7F. The bulletin covers the 2016 to 2020 RAV4 Hybrid, plus the Prius, Camry Hybrid, Avalon Hybrid, Highlander Hybrid, Corolla Hybrid and Mirai.

But here's the part a lot of videos get wrong. Toyota's bulletin doesn't say cleaning the filter clears P0A80. Once P0A80 or P0A7F is stored, the bulletin tells the dealer to "replace the HV battery and continue following the procedure." Then the dealer cleans or replaces the filter. The dealer also takes the cooling fan out of the car to clean it, since cleaning the fan in place can drop dust into the battery case.

So basically, by the time P0A80 shows up, a clogged filter has usually already hurt the battery. That's why the filter clean is how you keep from ever seeing P0A80, not how you fix it.

• Warranty: the bulletin says the repair falls under Toyota's hybrid system warranty. That's 10 years or 150,000 miles on a 2020 RAV4 Hybrid, and 8 years or 100,000 miles on a 2019.
• Which years: the bulletin itself only lists up to the 2020 model year. It isn't confirmed whether Toyota added 2021 and newer RAV4 Hybrids later. But the filter, fan and vent location are the same on the 2021 to 2025 RAV4 Hybrid.

How often P0A80 happens on a 2019 to 2026 RAV4

So out of more than 2,800 NHTSA owner complaints for the 2019 to 2026 RAV4, RAV4 Hybrid, RAV4 Prime and RAV4 Plug-in Hybrid, not one mentions P0A80 or P0A7F. The few that mention the "hybrid battery" are really about the 12-volt battery, no-starts, or a battery gauge that never shows full. And the battery gauge never showing full is normal, since Toyota keeps the hybrid battery in a middle range on purpose.

And keep in mind that the battery itself isn't the same on every RAV4 Hybrid. Most 2021 to 2025 XLE Premium, XSE, Limited and SE RAV4 Hybrids, and every 2026 RAV4 Hybrid, have a lithium-ion hybrid battery instead of the older nickel-metal hydride kind. It isn't confirmed which code numbers Toyota uses for a weak lithium-ion pack. So on those RAV4s, think "P0A80 or another hybrid battery code." My battery type guide shows how to tell which battery you have from the door jamb sticker.

Now two other codes, P0AA649 and P1C8049, mention the hybrid battery too, but they point to the corroded rear motor cable. Those are covered in my cable corrosion guide.

What to do when a hybrid battery warning or code shows up

So the order here matters, since the cheapest and most likely causes come first.

1. If the dash says "Maintenance Required for Traction Battery Cooling Parts": clean the filter yourself today, using the steps below. Then drive about 20 minutes. If the message stays on, see a dealer.
2. If the dash says "Hybrid System Malfunction" on a 2019 to 2024 RAV4 Hybrid or 2021 to 2024 Prime: ask the dealer about Customer Support Program 22TE09 by name. My cable corrosion guide has the exact words to use.
3. If a bunch of unrelated warnings show up at once, or the RAV4 won't start: check the 12-volt battery first, which I cover in my RAV4 12-volt battery guide.
4. If a scanner shows P0A80 or P0A7F: look at the filter anyway, and take a photo of it before anyone touches it. Then go to a Toyota dealer. On a 2019 or 2020, ask them to check T-SB-0074-20. And ask them to print the freeze-frame data and the block voltages.
5. Check your warranty. A 2020 to 2025 RAV4 Hybrid under 10 years or 150,000 miles, or a 2019 under 8 years or 100,000 miles, should be a warranty claim. My battery warranty section has the details.
6. Don't just clear the code and keep driving. Toyota's manual says that if you keep driving without the inspection, the hybrid system eventually won't start.

Basically, freeze-frame data is a snapshot of what the car was doing the moment the code set, like speed and temperature.

The RAV4 Hybrid battery cooling filter, year by year

So the hybrid battery gets warm as it works, and a small fan pulls air from the cabin to cool it. That air goes in through a grille with a paper filter behind it. Toyota's 2019 manual says a blocked vent can make the battery "overheat, leading to a reduction in hybrid battery (traction battery) output."

Basically, the vent is the grille on the side of the seat base that faces the rear footwell. It isn't under the seat cushion. And on the 2026 RAV4 Hybrid, Toyota's manual still puts the vent "under the right side of the rear seat," even though one 2026 review said the vent moved.

How to clean the filter on a 2019 to 2025 RAV4 Hybrid

So this takes a Phillips screwdriver and a vacuum, ideally with a plastic brush nozzle. The Car Care Nut, a Toyota master tech, also slides the front passenger seat and its backrest forward to make room.

1. Turn the RAV4 off.
2. Vacuum the grille with the cover still on. The 2019 to 2022 Hybrid manuals and the Prime manuals say that if the grille comes clean, you're done. The 2023 to 2025 Hybrid manuals skip this step and go straight to taking the cover off.
3. If the filter still looks dusty, take out the one plastic clip at the bottom right corner of the cover. Back the center pin out with the Phillips screwdriver, then pull the whole clip out.
4. Starting at the upper right corner, unhook the cover's 8 claws and pull the cover toward the front of the car.
5. Unhook the filter from the claws on the back of the cover. Toyota's manual says to do the 4 center claws first, then the outer ones. The filter is a little flimsy, so work the filter off one tab at a time.
6. Vacuum the filter lightly along the folds, and vacuum the inside of the cover. The 2023 to 2025 Hybrid manuals also say to hold the filter up to the light to check it's clear, and to see a dealer if the dust won't come out.
7. Clip the filter back onto the cover in reverse order, making sure it isn't crooked or bent. The filter is narrow on one end and wide on the other, and so is the vent, so line those ends up.
8. Push the cover back on, tab first and then the 8 claws, and put the clip back in.

How to clean the filter on a 2026 RAV4 Hybrid

Now the 2026 cover is different. There's no Phillips clip, so skip the Phillips screwdriver on a 2026.

1. Turn the RAV4 off.
2. Wrap the tip of a flat screwdriver in a rag, so it doesn't scratch the plastic.
3. Pry at the spot shown in the manual, release the 8 claws, and pull the cover toward the front of the car.
4. Unhook the filter from the cover: the 2 center claws first, then the outer ones.
5. Vacuum the filter lightly along the folds. Toyota suggests "a vacuum cleaner with plastic brushes."
6. Hold the filter up to the light to check it's clear. If dust or sand won't come out, see a dealer.
7. Put the filter and cover back on in reverse order.

The 2021 to 2024 RAV4 Prime and the Plug-in Hybrid

So the RAV4 Prime has a vent and filter in the exact same spot, under the passenger side of the back seat. But on the Prime, that filter cools the DC/DC converter, not the battery. Basically, the DC/DC converter changes the big battery's high voltage into the lower voltage the car's 12-volt system uses.

And the Prime's big battery is cooled a different way, so there's no battery air filter for a Prime owner to clean. When the Prime's filter clogs, the dash says "Maintenance required for DCDC converter cooling parts." The cleaning steps are the same as the 2019 to 2025 Hybrid above.

• 2025 RAV4 Plug-in Hybrid: Toyota's 2025 Warranty and Maintenance Guide doesn't list a DC/DC filter. So look under the right side of the back seat to see whether your 2025 has the vent.
• 2026 RAV4 Plug-in Hybrid: the 2026 owner's manual and maintenance guide show no battery or DC/DC vent to clean.

I cover the Prime's recalls and Toyota programs in my RAV4 Prime recalls guide.

How often to clean the battery cooling filter

So here's Toyota's schedule for the filter, by year.

• 2021 to 2026 RAV4 Hybrid: Toyota says to check the filter for dirt or dust every 5,000 miles and clean it every 20,000 miles.
• 2021 to 2024 RAV4 Prime: the same 5,000 and 20,000-mile schedule, for the DC/DC converter filter.
• 2019 and 2020 RAV4 Hybrid: Toyota's original guides only listed the filter clean for hard use, like taxis and delivery. Then bulletin T-SB-0062-20 in June 2020 recommended the same 5,000 and 20,000-mile schedule for the 2016 to 2020 RAV4 Hybrid.

And if you carry dogs, kids or rideshare passengers, or drive on dusty roads, Toyota's manuals say to clean the filter more often. The Car Care Nut's rule of thumb is to look every 1 to 3 months at first. If the filter stays clean, stretch to 6 months, then a year. The full schedule is on my RAV4 maintenance schedule.

Why dog hair and bags clog the filter

So the fan pulls cabin air through that grille, and anything nearby gets pulled with it. Toyota's manual says not to block the vent "with anything, such as a seat cover, plastic cover, or luggage."

• Pet hair: The Car Care Nut says pet hair ends up on the filter, so pet owners should check the filter more often. One owner reviewing the genuine filter says theirs was clogged "by two dogs and children."
• Bags and papers: The Car Care Nut routinely sees grocery bags, papers and fast-food bags sucked flat against the vent at the dealership.
• Dog seat covers and hammocks: a cover that drapes down the front of the right rear seat base can cover the grille. So pick one that stops at the seat edge, or tuck it so the grille shows.

And keep in mind that the battery fan running on high now and then is normal, since the car speeds the fan up when the battery needs it. But The Car Care Nut says if the fan runs on high all the time on a cold day, check the filter.

The filter part number and price

So Toyota says you can clean and reuse the filter. But if the filter is torn or bent, or the paper is getting soft, replace the filter. Here's what the filter costs, checked October 15, 2026.

Toyota named G92DH-42010 for the 2019 to 2020 RAV4 Hybrid in bulletin T-SB-0074-20. But the part number for the 2025 and 2026 RAV4 Hybrid isn't confirmed. So on a 2025 or 2026, give your VIN to a Toyota parts counter before you order.

And if you'd rather have the dealer do the filter, Toyota doesn't publish a price. Owners on the Bob Is The Oil Guy forum say dealers bill about an hour of labor for the job.

Checking your RAV4 Hybrid battery with an OBD2 app

So an OBD2 adapter plugs into the port under the dash, and a phone app reads data from the car through it. My battery life guide lists the apps and adapters with prices. Here I'll focus on what the numbers mean.

Which RAV4s an app can read

• Doctor Hybrid ELM OBD2 (Android, with its Toyota plugin) is the only one of these apps that lists the RAV4, as "RAV4 2015-."
• Hybrid Assistant (Android) lists the 2019 RAV4, but only shows charge level and temperature on a RAV4.
• Dr. Prius (iPhone, Android) doesn't list any RAV4.
• The Prime, the Plug-in Hybrid and the 2026 RAV4 Hybrid: no app is confirmed to read their battery.

How to read block voltages

So the useful number isn't any one block's voltage. It's the spread, meaning the gap between the highest and lowest block.

1. Read the blocks while driving or accelerating, not just parked. A weak block shows up under load.
2. Look at the gap between the highest and lowest block. A healthy hybrid battery keeps the blocks close together.
3. Watch whether the same block is always the lowest, and whether it falls further behind when you accelerate hard. That pattern is the warning sign.
4. If the app shows internal resistance per block, look for one block clearly higher than its neighbors. A single number on its own doesn't tell you much.

And keep in mind that temperature changes these readings. Also, unplugging the 12-volt battery resets the resistance readings to a default until the car relearns them.

So for me personally, an app makes the most sense as a way to track a trend. Take a baseline reading now, then repeat the reading every few months and compare. And if a reading looks bad before your warranty ends, that's a reason to ask the dealer for a scan while the repair is still free. Toyota's own dealer scan uses Techstream, which I cover in my battery life guide.

What your gas mileage tells you about the battery

So a clogged cooling filter is a cheap, easy-to-check cause of sliding mpg on a 2019 to 2026 RAV4 Hybrid. Toyota's manual says a blocked vent can cut how far the RAV4 drives on electric power alone, and "the fuel economy may be reduced."

And the order I'd check in is tires, oil grade and a dragging brake first, then the filter, and only then the battery. My RAV4 Hybrid mpg guide covers the first three. And compare the same season to the same season, since a winter tank against a summer tank says nothing about the battery.

The general signs of a weak battery are on my battery life guide, and what to expect past 100,000 miles is on my RAV4 at 200,000 miles page. And if you're shopping used, my used RAV4 buying guide includes the filter check on the test drive.

Videos that show the filter clean