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Home >> Toyota >> 2025 >> Prius Plug-In Hybrid SE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Hybrid Control System (HEV) - Diagnostic Codes (1 Of 4)) >> HYBRID CONTROL SYSTEM (for M20A-FXS) >> DTC P0688-1F: ECM/PCM Power Relay Sense Circuit Intermittent [12/2022 - ] >> Monitor Description

Monitor Description

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The hybrid vehicle control ECU monitors the +B power source voltage and detects momentary interruptions. If there is a momentary interruption in the +B power source voltage, the hybrid vehicle control ECU will illuminate the MIL and store a DTC.

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