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Home >> Toyota >> 2020 >> Highlander L, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Hybrid Control System - Diagnostic Codes (1 Of 5)) >> Hybrid Control System >> DTC P0688-1F: ECM/PCM Power Relay Sense Circuit Intermittent [11/2023 - ] >> Description

DTC P0688-1F: ECM/PCM Power Relay Sense Circuit Intermittent [11/2023 - ]: Description

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This DTC indicates that the hybrid vehicle control ECU detected an instantaneous interruption in +B power source voltage.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P0688-1F ECM/PCM Power Relay Sense Circuit Intermittent When the ignition switch is ON (READY), the hybrid vehicle control ECU is reset due to an instantaneous interruption of power source.
(1 trip detection logic)
  • Wire harness or connector
  • Hybrid vehicle control ECU
 Does not come on Master Warning:
Comes on
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