P0454 (2) — Chevrolet Uplander I (2004-2008)

P0454 (2) Chevrolet Uplander I

If, during the engine-off natural vacuum small leak test, DTC P0442, the engine control module (ECM) detects an abrupt FTP signal change, other than a refueling event, this DTC will set. An abrupt change is defined as a change of 1 inch H2O in the span of 1 second.