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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 131 (ENGINE CONTROLS - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P0401: EGR SYSTEM - INSUFFICIENT FLOWCONDITIONS FOR RUNNING DTC
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Conditions For Running DTC

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Conditions For Running DTC
WARNING: This page is about a different car, the 2003 Cadillac Seville and 2003 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
  • DTCs P0101, P0103, P0107, P0108, P0113, P0116, P0117, P0118, P0121, P0123, P0201, P0206, P0300, P0336, P0403, P0502, P0503, P0506, P0507, P1106, P1107, P1111, P1112, P1114, P1115, P1121, P1122, P1374, or P1404 are not set.
  • The system voltage is 11-18 volts.
  • The AC status does not change.
  • The transaxle range does not change.
  • The Throttle Position (TP) angle is less than 1.19 percent, deceleration.
  • The Intake Air Temperature (IAT) is more than 176°F (80°C).
  • The Deceleration Fuel Cut-Off (DFCO) steady for 0.3 second.
  • The Engine Coolant Temperature (ECT) is 176-230°F (80-110°C).
  • The engine speed is 700-1200 RPM.
  • The Idle Air Control (IAC) position is steady more than 8 counts.
  • The Manifold Absolute Pressure (MAP) is steady 11-50 kPa.
  • The vehicle speed is more than 22.9 MPH during deceleration.
  • The Barometric (BARO) pressure sensor is more than 70 kPa.
  • The vehicle will need to be driven faster than 50 MPH, and then allowed to decelerate. When the vehicle is decelerating while meeting all of the criteria listed above, the PCM will enable the test to run. As the test is running, you will see the Desired EGR parameter and the EGR position sensor on the scan tool change from zero to a calibrated value above zero.
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