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P0454 Chevrolet Uplander I

Testing & Diagnostics
  1. DTC P0454 runs only when the engine-off natural vacuum small leak test, DTC P0442, executes.
  2. This test can run once per engine-off period. The length of the test can be up to 10 minutes.
  3. A refueling event is not detected.

More articles — Engine Controls - 3.9L - DTC P0442 to P2A01