Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2018PRIUS TWO ECOREPAIR AND DIAGNOSISHYBRID/ELECTRIC POWERTRAINTESTING AND DIAGNOSISHYBRID CONTROL SYSTEM (LITHIUM-ION) - DIAGNOSTIC CODES (4 OF 4) & CIRCUIT TESTSHYBRID CONTROL SYSTEM (FOR LITHIUM-ION BATTERY)DTC U0424-81: HVAC CONTROL MODULE TO HYBRID POWERTRAIN CONTROL MODULE INVALID SERIAL DATA RECEIVED [11/2015 - ]CONFIRMATION DRIVING PATTERN
2018 Toyota Prius Two Eco
Confirmation Driving Pattern
2018 Toyota Prius Two EcoSECTION Confirmation Driving Pattern
HINT:
After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Refer to UTILITY [11/2015 - ]
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for 2 minutes or more.
- Turn the power switch on (IG) and turn the Techstream on.
- Wait for 1 minute or more with the vehicle stopped, the power switch on (READY), park (P) selected and the air conditioning system on (Lo/COOL MAX, blower speed HI).
- Turn the air conditioning system off and wait for 10 seconds or more with the power switch on (READY).
- Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
- Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform driving pattern again.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.