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 DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 5 (ENGINE CONTROLS - SELF-DIAGNOSTICS - 8.1L)DIAGNOSTIC TESTSDTC P0401: EGR SYSTEM - INSUFFICIENT FLOWCODE 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
WARNING: This page is about a different variant/trim than selected.
- DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0300, P0404, P0405, P0500, P0502, P0503, P0506, P0507, P0562, P0563, P1120, P1125, P1220 or P1221 are not set.
- Engine Coolant Temperature (ECT) is 140-244°F (60-118°C).
- Intake Air Temperature (IAT) is 37-167°F (3-75°C).
- Ignition voltage is 11.7-18.0 volts.
- Barometric (BARO) pressure is greater than 70 kPa.
- Vehicle speed is 25-70 MPH.
- Change in vehicle speed is less than 4 MPH.
- Change in Manifold Absolute Pressure (MAP) is less than 0.5 kPa.
- A/C clutch status is steady.
- Engine speed is 725-2000 RPM.
- Altitude compensated MAP is 10-60 kPa.
- Fuel system is not in deceleration fuel cut-off mode.
- Throttle Position (TP) sensor angle is less than 1.2 percent.
DTC will set when previous conditions are met and change in MAP is less than a predetermined value during EGR flow test for a minimum of 2 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.