2018 GMC Sierra OBDII Codes List

Exhaust Gas Temperature Sensor 3 Not Plausible

Exhaust Gas Temperature Sensor 4 Not Plausible

Exhaust Gas Temperature Sensor 5 Not Plausible

HO2S Insufficient Switching Bank 2 Sensor 1

O2 Reference Voltage Circuit (NOx Sensor 1)

O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1)

O2 Reference Voltage Circuit High Voltage (NOx Sensor 1)

O2 Signal Circuit (NOx Sensor 1)

O2 Signal Circuit Low Voltage (NOx Sensor 1)

O2 Signal Circuit High Voltage (NOx Sensor 1)

O2 Pump Current Control Circuit (NOx Sensor 1)

O2 Pump Current Control Circuit Low Voltage (NOx Sensor 1)

O2 Pump Current Control Circuit High Voltage (NOx Sensor 1)

Engine Block Coolant Valve Signal Message Counter Incorrect

Exhaust Gas Temperature Sensor 1 Performance Engine Running

Exhaust Gas Temperature Sensor 2 Performance Engine Running

O2 Low Reference Circuit (NOx Sensor 1)

O2 Low Reference Circuit Low Voltage (NOx Sensor 1)

O2 Low Reference Circuit High Voltage (NOx Sensor 1)

Exhaust Gas Temperature Sensor 3 Performance Engine Running