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 P0381TESTINGCIRCUIT/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.
- Ignition ON, verify that the instrument panel cluster warning indicators are illuminated.
- If the instrument panel cluster warning indicators are not illuminated, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, replace the P16 instrument panel cluster.
- Ignition OFF, disconnect ECM X1 harness connector. Ignition ON, the Wait to Start Lamp should not illuminate.
- If the Wait to Start Lamp is illuminated, test the Wait To Start Indicator Control circuit terminal X1 20 for a short to ground. If the circuit tests normal, replace the P16 instrument panel cluster.
- Ignition ON, connect a 3A fused jumper wire between the Wait To Start Indicator Control circuit terminal X1 20 and ground. The Wait to Start Lamp should illuminate.
- If the Wait to Start Lamp does not illuminate, test the Wait to Start Indicator Control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the P16 instrument panel cluster/bulb.
- If all circuits/connections test normal, replace the K20 engine control module.
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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.