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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Hybrid/EV System Heating And Cooling) >> Diagnostic Information and Procedures >> DTC P3064: Exhaust Heat Exchanger Exhaust Bypass Valve Position Sensor >> Circuit/System Description

Circuit/System Description

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The exhaust gas heat recovery system utilizes an exhaust mounted air-to-liquid heat exchanger to transfer wasted energy (heat) from the exhaust to help warm the engine coolant faster. An exhaust-mounted dual-butterfly valve allows engine exhaust to either flow across the exchanger or to bypass the exchanger.

The hybrid/EV powertrain control module 2 controls the dual-butterfly valve actuator via Local Interconnect Network (LIN) data messaging.

A valve position learning process is performed once at the beginning of every ignition-ON key cycle. The hybrid/EV powertrain control module 2 commands the dual-butterfly valve actuator between fully closed and fully open, if the valve command is not close to the actual valve position this DTC is set.

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