P1223 GMC - Injector 1 Output Circuit
P1223 GMC Possible Causes
- Faulty Fuel Injector 1
- Fuel Injector 1 harness is open or shorted
- Fuel Injector 1 circuit poor electrical connection
- Faulty Fuel Injection Control Module (FICM)
- Faulty Engine Control Module (ECM)
How is the P1223 GMC code repair?Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
There is a factory service bulletin for the following models:
2004 GMC Sierra
2005 GMC Sierra
2004 GMC Topkick
2005 GMC Topkick
2004-2005 GMC Sierra, Topkick Factory Service Bulletin OBDII Code P1223
What is the cost to diagnose the P1223 GMC code
Labor: 1.0The cost to diagnose the P1223 GMC code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine Misfire
- Rough Running
P1223 GMC MeaningThe Engine Control Module (ECM) enables the appropriate fuel injector on the compression stroke for each cylinder. The ECM controls the Fuel Injection Control Module (FICM) by grounding the control circuit via a solid state device called a driver. The ECM monitors the state of the driver. If the ECM detects an incorrect voltage for the commanded state of an injector driver, Diagnostic Trouble Code (DTC) P1223, P1226, P1229, P1232, P1235, P1238, P1241, or P1244 will set.
More InformationNeed more information on how to fix the P1223 GMC code?
Get Access to Factory Service Manuals