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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 67 (HVAC System - Manual) >> Diagnostic Information and Procedures >> DTC B012A: HVAC Controls >> Circuit/System Description

Circuit/System Description

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The BCM communicates with the HVAC control assembly via serial data. This DTC indicates an internal fault was reported by the HVAC control assembly. No external circuits are involved. The HVAC system may continue to operate normally when this DTC is set.

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