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 1280 (ENGINE CONTROLS AND FUEL - 3.6L - DTC P0137 TO DTC P0497)DTC P0446CIRCUIT/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 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
- Verify DTC P0450, P0451, P0452, P0453, P0458, P0459, P0498, or P0499, is not set.
- If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Disconnect the purge line from the EVAP purge valve.
- Ignition ON, observe the scan tool fuel tank pressure sensor parameter. The FTP sensor parameter should be 0 inches H2O. If the pressure is not at 0 inches H2O, verify the FTP sensor voltage is less than 4.7 volts.
- If the FTP sensor voltage is greater than 4.7 volts, refer to DTC P0452 or P0453 .
- Reconnect all previously disconnected EVAP hardware.
- Remove the fuel fill cap and connect the GE-41415-50 to the fuel tank filler neck. Connect the J 41413-200 to the GE-41415-50 . See Special Tools .
- Ignition ON, seal the EVAP system with a scan tool.
- Turn the nitrogen/smoke valve on the J 41413-200 to nitrogen. See Special Tools .
- Use the remote switch to activate the J 41413-200 and pressurize the fuel tank with nitrogen to 5 inches H20. See Special Tools .
- Observe the scan tool FTP sensor parameter, command the EVAP vent valve OFF. Verify the FTP Sensor parameter is 0 inches H2O.
- If not the specified value, test for a blockage or a restriction in the EVAP vent hose or inlet. If the inlet or hose test normal, replace the EVAP vent solenoid valve.
- Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records data.
IMPORTANT:
Refer to the J 41413-200
Evaporative Emissions System Tester (EEST) operation manual for detailed instructions. See Special Tools
.
IMPORTANT:
DO NOT exceed the specified value in this step. Exceeding the specified value may produce incorrect test results.
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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.