The California Air Resources Board (CARB) has issued a notice regarding stricter enforcement of warm-up cycles for vehicles that have recently undergone repairs or had their codes cleared. These vehicles often require additional warm-up cycles to ensure their engines reach optimal operating conditions, reducing emissions and improving fuel efficiency. CARB’s new guidelines emphasize that drivers must adhere to these warm-up procedures to meet emission standards and ensure cleaner air quality. Below is a statement from their website.
Clean Truck Check (CTC) second-phase readiness criteria will increase the minimum number of Operation Since codes Cleared (OSC) warm-up cycles from three to five. If the vehicle’s test result does not meet the OSC minimum, the vehicle result will be NOT READY and will not pass the OBD test. Also as part of the second phase, vehicles with a Permanent Diagnostic Trouble Code (PDTC) will have the minimum OSC levels below multiplied by a factor of three.
Phase 2 Minimum OSC
Minimum of 5 Warm-Up Cycles(15 if at least one PDTC is present)
If the vehicle OBD system does not collect Warm-Up Cycles, the CTC test will check for a minimum of 100 miles OSC (300 if at least one PDTC).
If neither WUC nor mileage are in the test record, the CTC test will check for a minimum of 200 minutes of OSC (600 if at least one PDTC).
Getting ready for the CTC OBD test
Things to do to have your best chance at passing the CTC OBD test:
If your Malfunction Indicator Light (right) is on, get your vehicle repaired as soon as possible.
Don’t wait - Do the OBD test early in the inspection compliance window so there will be time to complete the test if there are problems
Avoid clearing codes. OBD systems require substantial vehicle operation to be able to complete their emission control diagnostic tests.
A vehicle that has not been operated enough will fail the test.
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