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 MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 243 (ENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L)DIAGNOSTIC TESTSDTC P0446: EVAP VENT SYSTEM PERFORMANCECONDITIONS FOR RUNNING DTC
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
Conditions For Running DTC
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Conditions For Running DTC
WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
- DTCs P0107, P0108, P0112, P0113, P0117, P0118, P0122, P0123, P0452, or P0453 not set.
- Ignition voltage is 10-18 volts.
- Barometric Pressure (BARO) is more than 75 kPa.
- Fuel level is 15-85 percent.
- Engine Coolant Temperature (ECT) is 39-86°F (4-30°C).
- Intake Air Temperature (IAT) is 39-86°F (4-30°C).
- Start-up ECT and IAT are within 16°F (9°C) of each other.
- Vehicle Speed Sensor (VSS) is less than 75 MPH.
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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.