Toyota Prius common problems: what to check before you buy
Credov's researched list of the 16 faults the Toyota Prius is known for (2009–2015), 15 of them serious or costly. Each one says what to look for when you check the car, so you can spot it before you buy. Not every car has these faults: they are the ones worth checking on this model.
Known problems on the Toyota Prius
Hybrid system shutdown or limp mode
Safety risk
2010–2015 · 2ZR-FXE · hybrid · Hybrid and EV
What to look for: Drive it hard from a standstill until hot and look for a red warning triangle, hybrid warning or loss of power.
Why it matters: Toyota's recall documents describe two related inverter faults: excessive voltage in the Intelligent Power Module causing the hybrid system to shut down and the vehicle to stall while being driven (18V-684, 20V-369), and IPM transistor damage from high operating temperatures putting the car into a limited-power limp mode (14V-053, 15V-449).
What to look for: Ask for a Toyota dealer VIN check showing the free engine wiring harness recall fix has been done.
Why it matters: Toyota's recall report describes the harness contacting the cover and wearing over time, causing an electrical short that generates heat with an increased risk of vehicle fire. A fire risk on a car sitting in your yard is a total-loss exposure, and it is a free dealer fix, so there is no reason to take one on unremedied without pricing the trip in.
What to look for: Look for a 3163 recall sticker in the driver's door opening, and feel for a brake pedal that travels unusually far.
Why it matters: The MLIT notification records that the accumulator's strength was insufficiently assessed, so vertical vibration in service loads part of the pressure vessel, a fatigue crack forms, nitrogen gas gradually enters the brake fluid, pedal travel increases and braking performance falls. The remedy is replacement of the brake booster pump assembly containing a countermeasure accumulator.
2009–2012 · 2ZR-FXE · hybrid · Interior and air con
What to look for: Look for a 3835 recall sticker in the driver's door opening, or ask for the Japanese service record showing the airbag recall.
Why it matters: The MLIT notification records that improper handling when the production line stopped left microscopic cracks in the weld of the gas-filled curtain shield airbag inflator. Cabin temperature rising while the car is parked raises the enclosed gas pressure, the weld can fracture and part of the inflator can be projected into the cabin.
What to look for: Look for a 4185 recall sticker in the driver's door opening or a Japanese record; a normal airbag light doesn't settle it.
Why it matters: The MLIT notification records that the manufacturing conditions for the IC chip in the acceleration sensor or the pressure sensor were inadequate, so an open circuit can form inside the IC; the airbag warning lamp then illuminates and the airbags cannot operate properly.
What to look for: Turn to Ready with the engine bay quiet and listen near the brake fluid reservoir.
Why it matters: The car lights up ABS, BRAKE and VSC/TRAC together and stores C1252, C1253, C1256 or C1391. Braking becomes jerky at low speed, the pedal goes hard or long and regenerative braking blending is lost. Mostly a high-km failure; the full assembly must be replaced and bled with a scan tool. Used units are the common budget repair in NZ. Left unrepaired this is a safety risk on top of the repair bill.
What to look for: Any red triangle/master warning, or a scan showing P0A94, P324E, P0A1A, P3004, P0A78 or P0A7A, is serious.
Why it matters: Toyota bulletins for 2010–2015 Prius and 2012–2017 Prius v list P0A94, P324E, P0A1A and P3004. Symptoms: red triangle, car shuts down or will not go into Ready, loss of drive, 12 V charging warning. Fix is a new or used inverter assembly or IPM. Left unrepaired this is a safety risk on top of the repair bill.
What to look for: Ask the importer for a Japanese recall check on the chassis number, plus the auction sheet and any recall records.
Why it matters: The MLIT recall schedules behind the Japanese campaigns cited elsewhere in this overlay all state that the manufacturer notifies vehicle users by direct mail, with trade notification through the Japanese repairers' association journal and the manufacturer's own website.
What to look for: Look for a 3055 recall sticker in the driver's door opening, and for hybrid warning lights while it sits in READY.
Why it matters: The MLIT notification records that the winding process for the inverter electric water pump coil was inadequate, so coil wire could be damaged; corrosion then breaks the wire, stopping the pump and producing a warning lamp or output-limited running, and a short between windings blows the supply fuse and leaves the car unable to be driven.
What to look for: Feel for weak heat from the vents with the heater on full when warm, and check the coolant level when cold.
Why it matters: Toyota Japan's notice states that long idling or frequent short trips while the engine is still warming up cycle thermal stress through the exhaust heat recovery heat exchanger, cracking the coolant passage so coolant leaks into the exhaust pipe and falls; the heater then works poorly or the high coolant temperature warning lamp illuminates.
What to look for: Smell around the car, especially the rear corners, for petrol after it has been filled and parked.
Why it matters: Both MLIT notifications record that the resin evaporative gas passage end is inadequate - in one case the end shape, in the other insufficient strength against fuel swelling - so cracks form in service. Continued use lets the crack penetrate, fuel leaks when the tank is full and there is a fuel smell. Petrol leaking near a hot exhaust is a fire path, and a fuel smell in a used car is often dismissed as a spill.
What to look for: Red triangle or check-engine light on the dash.
Why it matters: The car sets P0A80 ('replace hybrid battery pack'), shows the red triangle 'Check Hybrid System' warning and the engine runs far more than normal. Corroded bus-bars between modules are common on these older packs and can trigger the same codes. Fix is a replacement or reconditioned pack; a cheap module swap often fails again within months. Left unrepaired this grows into a major repair bill.
What to look for: Take the cap off the inverter coolant reservoir (the smaller tank at the front) and look for coolant swirling/turbulence; still coolant means.
Why it matters: When it stops, the inverter overheats, P0A93 (inverter cooling system performance) sets, the car drops into reduced power and the inverter itself can be damaged. Low or old coolant and trapped air give the same code. Updated pump has a silver base (original black). Specialists have seen pump failures on cars with as little as about 90,000 km. Left unrepaired this grows into a major repair bill.
What to look for: Red triangle or check-engine light; P0A80/P0A7F on a scan.
Why it matters: Failing modules set P0A80 and the red triangle, the engine runs constantly and economy drops. NZ reconditioned packs are the common fix. Left unrepaired this grows into a major repair bill.
2015–2022 · 2ZR-FXE · hybrid · Exhaust and emissions
What to look for: Engine coolant reservoir low with no visible leak; white steam or sweet smell from the tailpipe; weak heater output.
Why it matters: Toyota bulletin T-SB-0135-19 lists low coolant, check-engine light with P148F00 and poor heater output, and replaces the front pipe with an updated part. Often misdiagnosed as a head gasket; pressure testing tells them apart. Running it low on coolant can still overheat the engine. Left unrepaired this grows into a major repair bill.
What to look for: Look around the catch in the driver's door opening for Toyota recall stickers, and photograph any numbers you find.
Why it matters: The instruction to apply a numbered sticker near the driver's door striker appears in the text of the Toyota recall notifications themselves, which makes it the one field marker a New Zealand dealer can read without a scan tool or a dealer account.
Got a question about a Toyota Prius? Ask Credov: a noise, a warning light, a part or how to fix it.
Also check on every car
On top of the faults above, every Credov inspection covers the basics: fuel smell, leaks or filler rust, engine oil leaks, power steering fluid leak, drive belt cracks or squeal, rust underneath: chassis and mounts, engine mounts, engine oil level and colour, coolant level, colour and leaks, head gasket failure signs, cold start: rattle, knock or smoke, rough or hunting idle, engine running hot on gauge, gearbox or diff oil leak, swapped gearbox without lvv and more.
Researched by Credov from manufacturer recalls and service bulletins, owner reports and workshop sources. Repair prices are typical ranges, not quotes. See also fault codes and repair costs.