P1156 GMC Possible Causes
- Faulty O2 sensor heater, Bank 2 Sensor 1
- O2 sensor heater, Bank 2 Sensor 1 harness is open or shorted
- O2 sensor heater circuit, Bank 2 Sensor 1 circuit poor electrical connection
How to Fix GMC Code P1156?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
- Engine light on (or engine service warning light soon)
P1156 GMC Meaning
HO2S Rich Mean Bank 2 Sensor 1 is the generic description for GMC code P1156, but the manufacturer may have a different description for your vehicle model and year. Currently, we do not have more information about OBDII code P1156 GMC.