California Engine Idle Limiting

All 2010 and newer Detroit™ engines built with the California (50-state) EPA certification are allowed to idle indefinitely when idle speed is below 900 rpm.

For California (50-state) EPA certification engines that idle above 900 rpm, the California Engine Idle Limiting feature is enabled. The engine will generally shut down after five minutes of continuous idling when the transmission is in neutral or park and the parking brake is set or after 15 minutes when the transmission is in neutral or park and the parking brake is not set. The automatic shutdown feature that is applied above 900 rpm is required for all California certified engines with the exception of engines used in specific vehicle types which the state of California has determined to be exempt from the idle shutdown requirement. These include buses, school buses, recreational vehicles, medium duty vehicles, military tactical vehicles, and authorized emergency vehicles as they are defined by the state of California. Owners of these vehicle types that wish to have the shutdown feature disabled should consult with California authorities to determine if their vehicles qualify for the exemption.

Non-California (49-state) EPA certification engines (non-California engines) have the automatic shutdown feature enabled.

In California and Opt-in states, extended idling above 900 rpm is not allowed unless the engine is performing a parked DPF regeneration or engaged in PTO operations such as pumping, hydraulics, etc.