Conditions for Setting the DTC
WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
C106A
Pump Motor Relay Circuit = Short to Ground
C106B
Pump Motor Relay Circuit = Short to Voltage
C106D
Valve Relay Circuit = Not Successful
C106E
Valve Relay Circuit = Malfunction
C106F
Valve Relay Circuit = Short to Ground
C1070
Valve Relay Circuit = Short to Voltage