21 / CALIFORNIA IDLING AND CAB POWER
California idling and cab power
When parking a heavy diesel truck in California, distinguish the propulsion engine from other power equipment before checking restrictions. A waiting-at-a-stop example shows why “five minutes” is not the whole rule or a substitute for its conditions.
When parking a heavy diesel truck in California, distinguish the propulsion engine from other power equipment before checking restrictions. A waiting-at-a-stop example shows why “five minutes” is not the whole rule or a substitute for its conditions.
This introductory guide uses CARB’s diesel-commercial-vehicle idling program page. The current CCR compilation and specific exceptions were not reverified in this batch; this page cannot establish an exemption for an individual vehicle or device.
Start with these requirements
Diesel commercial vehicles: the main engine generally may not idle beyond five minutes
- What the rule requires
- CARB’s official program page describes a general five-minute limit on primary-diesel-engine idling for diesel commercial vehicles over 10,000 lb GVWR, including sleeper-equipped trucks. This overview does not replace the full applicability, exceptions or operative-version analysis of §2485; out-of-state plates alone do not establish an exemption.
- Conditions and exceptions
- This is an official program summary; confirm actual exceptions and subsequent changes in the full official rule.
This Airborne Toxic Control Measure is set forth in title 13, CCR, section 2485, and requires, among other things, that drivers of diesel-fueled commercial motor vehicles with gross vehicle weight ratings greater than 10,000 pounds, including buses and sleeper berth equipped trucks, not idle the vehicle’s primary diesel engine longer than five minutes at any location. More about this program
Uses a fixed source edition; check the original and statutory history for operative dates and exceptions.
Cab-power conditions vary by device type
- What the rule requires
- The propulsion engine, fuel-fired auxiliary equipment and battery/shore power are different devices. CARB links separately to sleeper-berth idle-reduction technologies and formal rules. Before buying or using a system, check its equipment, engine-year, installation and location conditions rather than assuming any APU is automatically compliant. This is a checking recommendation, not a new technical legal standard.
This Airborne Toxic Control Measure is set forth in title 13, CCR, section 2485, and requires, among other things, that drivers of diesel-fueled commercial motor vehicles with gross vehicle weight ratings greater than 10,000 pounds, including buses and sleeper berth equipped trucks, not idle the vehicle’s primary diesel engine longer than five minutes at any location. More about this program
Idle Reduction Technologies for Sleeper Berth Vehicles
Formal Regulatory Documents as last amended on December 12, 2013
Uses a fixed source edition; check the original and statutory history for operative dates and exceptions.
WORKED EXAMPLE
Waiting for a warehouse—leave the engine running?
Illustrative example: a driver arrives early, plans to rest in a stationary truck and assumes a sleeper berth permits continuous idling.
Plan around the general limit
Do not infer an exemption from having a sleeper; plan parking and power around the general limit.
Verify any special circumstance
If a safety, equipment or other exception is thought to apply, verify its conditions in the full official rule rather than treating hearsay as permission.
Arrange suitable parking and power, then verify whether any specific exception applies.
Common mistakes in day-to-day work
Misconception: one time limit answers every case
The program page provides a baseline. Vehicle condition, location, equipment and rule version affect the analysis; this topic does not verify special exemptions or represent a legacy snapshot as confirmed current law.
Full text and sources
OFFICIAL GUIDANCE · ENGLISH
Airborne Toxic Control Measure to Limit Diesel-Fueled Commercial Motor Vehicle Idling
Airborne Toxic Control Measure to Limit Diesel-Fueled Commercial Motor Vehicle Idling
- Source edition date
- Not provided
- Captured
Edition noteOfficial-source snapshot; current consolidated law and subsequent amendments have not been verified.
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Drafted from linked official texts and agency guidance. Both language interpretations are CTAC AI-assisted drafts pending human review; examples are illustrative, not member records. Capture dates are not legal effective dates.