P1139 GMC Possible Causes
- Faulty HO2S, Bank 1 Sensor 2
- Open or short circuit in HO2S Bank 1 Sensor 2 wiring harness
- Poor electrical connection in HO2S Bank 1 Sensor 2 circuit
How to Fix GMC Code P1139?
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
- Check Engine Light on (or Service Engine Soon warning light)
P1139 GMC Meaning
HO2S Insufficient Switching, Bank 1 Sensor 2 is the generic description for GMC code P1139, but the manufacturer may have a different description for your specific vehicle model and year. Currently, we have no further information about OBDII code P1139 GMC.