How to Fix P1109 GMC Code?
Start by checking the “possible causes” listed above. Visually inspect the wiring harness and corresponding connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
Check Engine Light illuminated (or engine service warning light soon)
P1109 GMC Meaning
The secondary port throttle system is the generic description for GMC P1109 code, but the manufacturer may have a different description for your specific vehicle model and year. Currently, we don’t have additional information about the GMC P1109 OBDII code.