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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 249 (ENGINE CONTROLS AND FUEL - 4.4L - DTC P0650 TO DTC P2544)DTC P1400CONDITIONS FOR RUNNING THE DTC
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Conditions for Running the DTC

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Conditions for Running the DTC
WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
  • The engine is running, and a cold start has been detected.
  • The vehicle speed is less than 2 km/h (1 mph).
  • The throttle position sensor is less than 2 percent.
  • The airflow per cylinder is greater than 40 mg.
  • DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0201-P0208, P0300, P0301-P0308, P0335, P0336, P0351-P0358, P0506, P0507, P0601, P0602, P0604, P0606, P0607, P060D, P062F, P0641, P0651, P1101, P1516, P1682, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, P2176, or P2610 are not set.
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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.