P1203 GMC Possible Causes
- Faulty mass air flow sensor
- Mass air flow sensor harness is open or shorted
- Poor electrical connection in mass air flow sensor circuit
How to Fix GMC Code P1203?
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)
P1203 GMC Meaning
Mass Air Flow Sensor Circuit High Frequency is the generic description for P1203 Gmc code, but the manufacturer may have a different description for your vehicle’s model and year. Currently, we have no further information about OBDII code P1203 Gmc.