P1143 GMC Possible Causes
- Faulty oxygen sensor, bank 1
- Bank 1 oxygen sensor harness is open or shorted
- Poor electrical connection in oxygen sensor circuit, bank 1
How to Fix GMC Code P1143?
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 service engine soon warning light)
P1143 GMC Meaning
HO2S, bank 1 sensor 3, lean system or low voltage is the generic description for GMC code P1143, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information about OBDII code P1143 GMC.