OBD-II Code
P1497
Severity
Not yet reviewed
Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.
Can you drive it
We cannot say
Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.
Indicative cost (USD)
$50–$450
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
P1497 on a Toyota Prius means the Inverter Cooling System Error — the hybrid power-control unit (PCU) has its own dedicated low-temperature coolant loop separate from the engine cooling system, and P1497 sets when the inverter coolant temperature sensor, the inverter electric water pump, or the loop's flow integrity is out of spec.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then follow the diagnostic notes further down this page, in the order they are written.
They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Read the full diagnostic procedureP1497 on a Toyota Prius means the Inverter Cooling System Error — the hybrid power-control unit (PCU) has its own dedicated low-temperature coolant l…
P1497 on a Toyota Prius means the Inverter Cooling System Error — the hybrid power-control unit (PCU) has its own dedicated low-temperature coolant loop separate from the engine cooling system, and P1497 sets when the inverter coolant temperature sensor, the inverter electric water pump, or the loop's flow integrity is out of spec. Healthy inverter coolant runs 60-150°F under normal operation (versus the engine loop which runs 180-210°F), and the inverter electric pump draws 0.5-1.5A continuously when the hybrid system is ready.
Cheapest-first ladder
- check the inverter coolant reservoir level first — it's a separate plastic tank near the firewall on Gen 2 (2004-2009) and tucked behind the headlight on Gen 3 (2010-2015), and the pump cavitates and the temp sensor reads out-of-range the moment the level drops below the LOW mark. Topping off with Toyota Super Long Life Coolant (pink) closes this code roughly 30% of the time.
- Listen for the inverter pump running with the car in READY mode — it should run continuously with an audible electric whine; if it's silent, pull the pump connector and check for 12V on the supply pin and current draw of 0.5-1.5A. A locked-rotor pump reads 0A or pins at fuse-blow current.
- Scan inverter coolant temp on the hybrid ECU PIDs (Techstream or compatible scan tool required); healthy temp at warm idle reads 80-120°F. If the sensor reads -40°F (open circuit) or 250°F+ (shorted), the temp sensor or its harness is the fault. Expensive-misdiagnosis caveat: do not replace the inverter assembly for P1497 — the inverter itself is a $3,500-$5,500 part and the fault is virtually always in the cooling loop (pump, coolant level, sensor, or hose) which together total $50-$250.
Vehicle-specific patterns2004-2009 Toyota Prius Gen 2 (1NZ-FXE 1.5L) is the most common P1497 platform — the inverter electric water pump (Aisin part) has a documented failur…
- 2004-2009Toyota Prius Gen 2 (1NZ-FXE 1.5L) is the most common P1497 platform — the inverter electric water pump (Aisin part) has a documented failure pattern around 150K-200K mi where the impeller bearing fails, and the pump goes silent. Toyota issued enhanced warranty coverage on the pump for some VINs.
- 2010-2015Prius Gen 3 (2ZR-FXE 1.8L) throws P1497 with a similar pattern but the pump tends to last longer (200K+ mi) and the temp sensor itself is a more common failure mode on Gen 3.
- 2012-2017Prius v wagon and 2012-2015 Prius c also share the same architecture and the same fault modes.
- 2006-2008Lexus RX400h and 2010-2015 RX450h hybrid use a similar but larger inverter cooling loop with the 2GR-FXE/3MZ-FXE V6 hybrid and throw P1497 from the same root causes.
Estimated repair$50 to $450.
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