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 MANUALSTOYOTA2025HIGHLANDER XLE, FWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALSTARTERSTOP AND START SYSTEM - DIAGNOSTIC CODES (1 OF 3)STOP AND START SYSTEMDTC P062F-46: INTERNAL CONTROL MODULE EEPROM CALIBRATION / PARAMETER MEMORY FAILURE [12/2019 - 10/2022]CAUTION / NOTICE / HINT
2025 Toyota Highlander XLE, FWD
Caution / Notice / Hint
2025 Toyota Highlander XLE, FWDSECTION Caution / Notice / Hint
NOTE:
- Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU.
Refer to REGISTRATION [12/2019 - 10/2022]
- After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU.
Refer to REGISTRATION [12/2019 - 10/2022]
- After replacing the engine stop and start ECU or airbag sensor assembly, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU.
Refer to REGISTRATION [12/2019 - 10/2022]
- When the engine stop and start ECU or oil pump with solenoid assembly is replaced, check the oil pump with solenoid assembly.
Refer to REGISTRATION [12/2019 - 10/2022]
- After replacing the engine stop and start ECU assembly, perform learning of the external backup boost converter (eco run vehicle converter assembly).
Refer to REGISTRATION [12/2019 - 10/2022]
HINT:
- Using the GTS, read the Freeze Frame Data before troubleshooting. System condition information is recorded as Freeze Frame Data the moment a DTC is stored. This information can be useful when troubleshooting.
- DTCs for the stop and start system are not cleared even if the malfunction has been repaired. After repairing the malfunction, be sure to clear the DTCs.
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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.