P0A93
P0A93: inverter cooling system performance
- Repair orders
- 150Fault code P0A93
- Shops
- 2Two shops in the network
- As of
- Read live from Shop-Ware
At each shop. Two shops have this work in their own repair orders.
Atomic AutoPortland, OR148Model years 2004-2009- Replaced the inverter 145 times
- Repaired the inverter 2 times
Earthling AutomotiveSan Francisco, CA2Model years 2005-2008- Replaced the inverter 2 times
P0A93 means the inverter is running hotter than it should. It is almost always about coolant flow, not the inverter itself.
P0A93 sets when the hybrid control system sees the inverter coolant temperature outside the range it expects for the conditions. On a Prius the usual culprit is the electric inverter coolant pump, followed by low coolant, air in the loop or a blocked radiator section.
What owners notice
A coolant warning, an overheating gauge, hybrid system warnings that seem unrelated, weak cabin heat, or coolant on the ground. On hybrids, an engine that runs in short bursts can hide a cooling problem until a long drive.
What the shops check first
Which loop is involved: the engine loop or the separate loop for the hybrid electronics. Then pump operation, leaks, the coolant's condition and level, and the sensors that report temperature, since a wrong reading can trigger the same warnings as real heat.
What the repair usually involves
Water pumps, electric coolant pumps, valves, thermostats, hoses and sensors, followed by a careful bleed. Hybrid loops trap air easily, and the shops verify flow and temperatures on a road test before the car goes home.
What the shops' records show
The count at the top of this report is every repair order matching this problem across the EV Partners shops, recounted from their Shop-Ware records whenever they sync. Below it, each shop that has done this work shows its own share, the model years it saw and what it did, with a link to its own write-up where one exists.
Questions owners ask
Is P0A93 expensive to fix?
It depends on what the testing finds. Many cases end with a smaller part than owners fear. The shops test before they quote and explain the options and their trade-offs first.
Can I keep driving with P0A93?
Sometimes, for a short while, but warning lights on a hybrid or EV are worth checking soon. Some faults reduce power or stop the car without much notice, and a few involve high voltage. Call one of the shops and describe what the car is doing.
Which shops in the network work on this?
The shops listed in the At each shop section have repair orders for this problem in their own records. Each one books its own work, so contact the one nearest you directly.
Cite this report
EV Partners (2026). P0A93: inverter cooling system performance. EV Repair Hub. 150 repair orders from Atomic Auto and Earthling Automotive, counted Oct 29, 2026.
We count the repairs. These shops do them.
EV Partners does not repair cars. Call a shop and tell them the code, P0A93.
San Francisco, CA
615 Bayshore Blvd, San Francisco, CA 94124
