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 MANUALSCHEVROLET2006SUBURBAN C2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1190 (ENGINE CONTROLS AND FUEL - 6.6L - DTC P1224 TO DTC P2463)DTC P2146, P2149, P2152, OR P2155CIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban C2500, 6.0 U
Circuit/System Testing
2006 Chevrolet Suburban C2500, 6.0 USECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
If you cannot duplicate the condition, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
- Turn OFF the ignition.
- Disconnect the ECM connector.
- Connect a test lamp between the fuel injector positive voltage control circuit and battery voltage. The test lamp should not illuminate.
- If the test lamp illuminates, test the fuel injector positive voltage circuit for a short to ground.
- Connect a test lamp between the affected fuel injector positive voltage control circuit and a ground. The test lamp should not illuminate.
- If the test lamp illuminates, test the fuel injector positive voltage control circuit for a short to voltage.
- Connect a test lamp between the affected fuel injector control circuit and battery voltage. The test lamp should not illuminate.
- If the test lamp illuminates, test both fuel injector control circuits of the affected group for a short to ground.
- Test the affected fuel injector positive voltage control circuit and the fuel injector control circuit for high resistance.
- Test the affected fuel injector for high resistance. Refer to Component Testing in this diagnostic.
- If all circuits test normal, replace the ECM.
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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.