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 P1082TESTINGCIRCUIT/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.
- Install the CH-48027
to the fuel system service port on the right front side of the engine. Verify the CH-48027
displays 0 in Hg.
- If not the specified value, refer to Fuel System Diagnosis .
- Ignition OFF, disconnect the harness connector at the B181 fuel filter pressure switch.
- Test for less than 10 Ξ© between the B181 fuel filter pressure switch terminal A and terminal B.
- If greater than the specified value, replace the B181 fuel filter pressure switch.
- Test for less than 5 Ξ© between the low reference circuit terminal B and ground.
- If greater than the specified value, repair the open or high resistance in the low reference circuit.
- Ignition ON, verify the scan tool Fuel Pressure Switch parameter displays High Pressure.
- If other than the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the K20 engine control module.
- Install a 3 A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the scan tool Fuel Filer Pressure Switch parameter displays Normal.
- If other than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
- If all circuits test normal, refer to Diagnostic Aids above.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.