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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Manual Transmission - Y4A/Y4M) >> Diagnostic Information and Procedures >> DTC P0812 >> Circuit/System Description

Circuit/System Description

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The reverse gear switch is a normally open switch that closes with the reverse gear engagement. When the switch is open the engine control module should detect a high signal voltage input. When the switch is closed the ECM should detect a low signal voltage input.