Thinking about buying a used Toyota Prius Alpha (2011–2017) in New Zealand? We've documented 6 known faults for this model spanning transmission, cooling, electrical, and suspension. Each researched and verified before it's published. The most serious issues here are rated critical. Two are set out in full below — the rest, with the symptoms, repair costs and checks for each, are free with an account.
6
Documented faults
Critical
Most serious
$350–$800
Typical repair
5
Systems covered
Known Toyota Prius Alpha faults
Every fault below is documented specifically for this model — researched and verified before it’s published.
CriticalOccasionalTransmission $3,500–$8,500 to fix
The Motor Generator No.2 (MG2) resolver in the ZVW40 hybrid transaxle provides rotor position and speed feedback to the Power Management Control ECU. When resolver windings or signal circuits degrade from thermal cycling at high mileage, the hybrid system loses accurate drive motor data and triggers DTC P3190 (and commonly P3105). The vehicle enters failsafe — the Ready indicator will not illuminate and the car cannot be driven. Resolver degradation is caused by insulation breakdown in the transaxle winding over sustained heat cycling and is not field-repairable; the transaxle requires overhaul or replacement. Most presentations occur beyond 120,000 km on grey import ZVW40 units.
Symptoms to notice
Red hybrid system warning triangle illuminated on dash
Ready indicator fails to illuminate after pressing power button
DTC P3190 or P3105 stored in hybrid system ECU
Vehicle will not enter drive mode — completely immobilised
Intermittent traction power loss before full failsafe lockout
What to check
Scan hybrid ECU for DTCs P3190 and P3105 using a Toyota-capable scanner. Check transaxle resolver harness connector under centre console for corrosion or pushed pins. Note odometer — resolver faults concentrate above 120,000 km. Request full hybrid ECU freeze-frame data from the seller before purchase.
Where to look: MG2 resolver winding internal to hybrid transaxle assembly, centre of vehicle beneath floor tunnel
Ask the seller
“Has the vehicle ever shown a red hybrid system warning triangle on the dash?”
“Has any hybrid or traction system DTC ever been stored or cleared?”
“What is the full service history of the transaxle and hybrid system?”
02Front Lower Arm Inner Bush Failure Steering Pull
MinorCommonSuspension $380–$900 to fix
The ZVW40 front suspension lower control arm uses pressed-in rubber-to-metal inner pivot bushes at both the front and rear inboard mounts. The front inner bush is most susceptible to rubber compound separation from the metal sleeve under the combination of NZ road conditions and the relatively light steering loads typical of hybrid urban driving. Once the rubber-to-metal bond fails, the bush allows fore-aft movement of the lower arm pivot, changing front wheel alignment geometry dynamically under cornering and braking loads. Drivers experience a persistent directional pull, steering vibration at 80-110 km/h, and a clunk over transverse road seams. Because the bush is pressed into a cast aluminium arm, replacement typically requires a hydraulic press and most independent workshops replace the complete arm rather than pressing a new bush.
Symptoms to notice
Persistent steering pull to one side not resolved by wheel alignment adjustment
Steering wheel vibration felt between 80 and 110 km/h
Clunking from front suspension area over potholes or transverse road joints
Rapid or uneven front tyre wear after a recent wheel alignment
Front alignment angles drifting outside Toyota specification on recheck within months
What to check
Inspect the bush rubber face visually for cracking, extrusion beyond the metal sleeve, or visible separation. Request a printed alignment report and check castor deviation between sides — asymmetric castor with an otherwise sound vehicle points to inner bush collapse. If a workshop inspection is possible: With the vehicle on a hoist, grip each front lower arm firmly and attempt to move it fore and aft in the pivot direction — any movement beyond 2 mm indicates failed inner bush rubber.
Where to look: Front lower control arm inner pivot bush at both front corners, inboard end of arm where it mounts to front subframe
Ask the seller
“Has a wheel alignment been performed in the past 12 months and did the angles hold on recheck?”
“Have the front lower control arm bushes or arms been inspected or replaced?”
“Is there any clunking, pulling, or vibration from the front suspension when driving?”
CoolingMajor
CoolingMajor
ElectricalMajor
Body & RustMinor
4 more documented faults on the Toyota Prius Alpha
Symptoms, what to check, where to look and what to ask the seller — for every fault above. Free with an account, no card needed. One account covers one vehicle, so make it the car you’re actually looking at.
This page covers the model. Enter the plate of the actual car you’re looking at and see its year, engine, safety rating and register flags — free, no account needed.
Like any used car, it depends on the specific example and its service history. Across the 6 documented faults for the Toyota Prius Alpha, the recurring problem areas are transmission, cooling, and electrical. A Toyota Prius Alpha with a full service history and no signs of the issues listed on this page can be a sound buy but each one needs to be checked individually before you commit.
What are the most common problems with a used Toyota Prius Alpha?
+
We've catalogued 6 known faults for the Toyota Prius Alpha, covering transmission, cooling, and electrical. Two are written out in full on this page. The rest — with the symptoms to notice, what to inspect, and typical repair costs for each — are free once you create an account.
How much do repairs cost on a Toyota Prius Alpha?
+
Most single repairs on the Toyota Prius Alpha fall between $350–$800 at NZ independent-workshop rates. Some of the 6 documented faults cost less and a few cost considerably more, and no one car needs them all. Knowing which ones to look for before you view is what lets you negotiate the price down or walk away.
Should I get a pre-purchase inspection on a Toyota Prius Alpha?
+
Yes. A Toyota Prius Alpha inspection focused on its known weak points is the single best way to avoid an expensive mistake. KickTyres gives you a guided, model-specific inspection plus a market valuation and negotiation figure for $17.90 far less than the cost of missing one of the faults on this page.