2018 GMC Sierra OBDII Codes List

Intake Air Temperature Sensor Circuit Low Voltage

Intake Air Temperature Circuit High Input

Intake Air Temperature Circuit Intermittent

Engine Coolant Temperature Sensor Performance

Engine Coolant Temperature Circuit Low Input

Engine Coolant Temperature Circuit High Input

Engine Coolant Temperature Circuit Intermittent

Throttle Position Sensor 1 Performance

Throttle Position Sensor 1 Circuit Low Voltage

Throttle Position Sensor Circuit High Voltage

Engine Coolant Temperature Below Thermostat Regulating Temperature

HO2S Circuit Low Voltage Bank 1 Sensor 1

HO2S Circuit High Voltage Bank 1 Sensor 1

HO2S Slow Response Bank 1 Sensor 1

HO2S Heater Performance Bank 1 Sensor 1

HO2S Circuit Low Voltage Bank 1 Sensor 2

HO2S Circuit High Voltage Bank 1 Sensor 2

HO2S Slow Response Rich to Lean Bank 1 Sensor 2

HO2S Slow Response Lean to Rich Bank 1 Sensor 2

HO2S Slow Response Rich to Lean Bank 2 Sensor 2