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P0451 Chevrolet Uplander I

Testing & Diagnostics
  1. DTC P0451 runs only when the engine-off natural vacuum small leak test, DTC P0442, executes.
  2. The number of times this test runs can range from 0-2 per engine-off period. The length of the test can be up to 10 minutes.

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