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 MANUALSCHEVROLET2019TAHOE LS, 4WD, GAS/ETHANOLREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 130 (ENGINE CONTROLS/FUEL - 1.4L (LUV) - DTC P0300 TO DTC P2635 & SYMPTOMS)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0496CIRCUIT/SYSTEM TESTING
2019 Chevrolet Tahoe LS, 4WD, Gas/Ethanol
Circuit/System Testing
2019 Chevrolet Tahoe LS, 4WD, Gas/EthanolSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2018 Chevrolet Sonic. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- Vehicle and service department temperature and fuel level (vapor pressure) can affect the fuel tank pressure sensor parameter. Ensure the vehicle temperature has stabilized to service department temperature to ensure greatest accuracy.
- Be sure the EVAP Purge Solenoid Valve command is 0% or this test will not work.
- Ignition ON.
- Command the EVAP Purge/Seal function to System Seal or Not Venting with a scan tool.
- Engine Running.
- Verify the Fuel Tank Pressure Sensor parameter is less than 1.9 V for greater than 90 s.
- If greater than 1.9 V
Replace the Q12 Evaporative Emission Purge Solenoid Valve
- Go to next step: If less than 1.9 V
- If greater than 1.9 V
- All OK
RENDER: 1.0x
NO RELATED
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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.