P1231 GMC Possible Causes
- Faulty fuel injector 4
- Fuel injector 4 harness is open or shorted
- Poor electrical connection in fuel injector 4 circuit
How to Fix GMC Code P1231?
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)
P1231 GMC Meaning
Cylinder 4 Injector Circuit Intermittent is the generic description for GMC code P1231, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information about OBDII code P1231 GMC.