Experiencing “OBDII monitors not ready” on your 2003 Chevy Silverado can be frustrating, especially when facing emission testing. These monitors, part of your vehicle’s onboard diagnostic system, need to be in a “ready” state to pass inspection. If you’re using an OBD2 scanner and seeing incomplete monitors, particularly the EVAP monitor, you’re not alone.
Understanding emission standards is key. For 2000 and newer vehicles, regulations typically allow for the EVAP monitor to be “not ready” without causing a smog check failure. This is crucial for owners of vehicles like the 2003 Chevy Silverado. Older vehicles, specifically 1996-1999 models, are often permitted one incomplete monitor of any type.
If your 2003 Chevy Silverado is showing OBDII monitors not ready, and you’re concerned about emission tests, check your local regulations. You might find that, like the original poster discovered, your vehicle can still pass inspection with an incomplete EVAP monitor. Using an OBD2 code reader to check I/M readiness is a straightforward way to assess your vehicle’s status before heading for an official test. Knowing the specific rules for your vehicle’s year can save you unnecessary stress and potential repair costs.
