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 MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS SELF-DIAGNOSTICS - 5.0L & 5.7LDIAGNOSTIC TESTSDTC P0171 & P0174: FUEL TRIM SYSTEM LEAN - BANK 1 OR 2CODE ENABLE CRITERIA
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M
Code Enable Criteria
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Code Enable Criteria
- Engine Coolant Temperature (ECT) is 167-239°F (75-115°C).
- Intake Air Temperature (IAT) is 4-194°F (-20-90°C).
- Manifold Absolute Pressure (MAP) is 26-90 kPa.
- Vehicle speed is less than 85 MPH.
- Engine speed is 400-3000 RPM.
- Barometric (BARO) pressure is more than 74 kPa.
- Mass Airflow (MAF) is 5-90 grams/second.
- Fuel level is more than 10 percent.
- Throttle Position (TP) is less than 90 percent.
- DTCs P0101, P0103, P0108, P0135, P0137, P0141, P0200, P0300, P0410, P0420, P0430, P0440, P0442, P0443, P0446, P0449, P0506, P0507 or P1441 are not set.
DTC sets when average long term fuel trim cell value is more than 23 percent. All conditions are present for 6 seconds.
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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.