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 143 (ENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - 3.1L ENGINE)DIAGNOSTIC TESTSDTC P0440: EVAP SYSTEMCONDITIONS FOR CLEARING MIL/DTC
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
Conditions For Clearing MIL/DTC
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Conditions For Clearing MIL/DTC
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix, 2002 Chevrolet Malibu, and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- The control module will turn the MIL off during the first trip in which the diagnostic has been run and passed.
- A last test failed (current DTC) clears when the control module turns off the MIL.
- The history DTC will clear after the control module runs and passes 40 consecutive warm up cycles with no failure.
- The DTC can be cleared by using a scan tool.
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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.