What causes a P153B code?

P153B can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a P153B code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P153B active.

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBDIY

OBD-II

P153B

Crankcase Oil Mist Separator rotor underspeed

What it means

The engine ECM monitors the speed of the centrifugal oil mist separator rotor (part of the crankcase ventilation system). This code sets when the rotor speed falls below a calibrated threshold, meaning it isn't effectively removing oil mist from blow-by gases.