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 HYBRID XLEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM (A25A-FXS) - DIAGNOSTIC CODES (P0400-P0450)SFI SYSTEMDTC P0403-18: EXHAUST GAS RECIRCULATION "A" CIRCUIT CURRENT BELOW THRESHOLD; DTC P0403-19: EXHAUST GAS RECIRCULATION "A" CIRCUIT CURRENT ABOVE THRESHOLD; DTC P1400-18: EXHAUST GAS RECIRCULATION "A" CONTROL CIRCUIT 2 CIRCUIT CURRENT BELOW THRESHOLD; DTC P1400-19: EXHAUST GAS RECIRCULATION "A" CONTROL CIRCUIT 2 CIRCUIT CURRENT ABOVE THRESHOLD [10/2022 - 11/2023]TYPICAL ENABLING CONDITIONS
2025 Toyota Highlander Hybrid XLE
Typical Enabling Conditions
2025 Toyota Highlander Hybrid XLESECTION Typical Enabling Conditions
ALL
| Both of the following conditions are met | - |
| Auxiliary battery voltage | 10.5 V or higher |
| Time after ignition switch off to ON | 0.5 seconds or more |
P0489: EGR A CIRCUIT RANGE CHECK (LOW VOLTAGE)
| Exhaust gas recirculation control circuit motor phase A high current fail (P0490) | Not detected |
P0489: EGR B CIRCUIT RANGE CHECK (LOW VOLTAGE)
| Exhaust gas recirculation control circuit motor phase B high current fail (P0490) | Not detected |
P0490: EGR A CIRCUIT RANGE CHECK (HIGH CURRENT)
| Exhaust gas recirculation control circuit motor phase A low voltage fail (P0489) | Not detected |
P0490: EGR B CIRCUIT RANGE CHECK (HIGH CURRENT)
| Exhaust gas recirculation control circuit motor phase B low voltage fail (P0489) | Not detected |
RENDER: 1.0x
NO RELATED
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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.