Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC2011SAVANA SPECIAL 4.8 AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 4 (ENGINE CONTROLS AND FUEL - 6.6L (LGH) - DTC P0016 THROUGH DTC P11DC)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0300-P0308TESTINGCIRCUIT/SYSTEM TESTING
2011 GMC Savana Special 4.8 A
Circuit/System Testing
2011 GMC Savana Special 4.8 ASECTION Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
NOTE:
You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
- Ignition ON, observe the DTC information with a scan tool.
- If a DTC, other than P0300-P0308, P0263, P0266, P0269, P0272, P0275, P0278, P0281, P0284, or P12B3-P12C1 is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- With a scan tool, perform the Cylinder Compression Test.
- If the compression test results are erratic, refer to Engine Compression Test .
- Perform the Crankshaft Position Reluctor Wheel Learn procedure. Refer to, Crankshaft Position Reluctor Wheel Learn .
- Operate the vehicle within the Conditions for Running the DTC to verify that the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
- Ignition ON, observe the DTC information with a scan tool.
- If DTC P0301-P0308 is set, replace the injector for the cyclinder with the Misfire DTC. Refer to Fuel Injector Replacement (Right Side) , Fuel Injector Replacement (Left Side) .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.