What causes a P0386 code?

P0386 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 P0386 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0386 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

P0386

Crankshaft Position Sensor 'B' Range/Performance

What it means

The Engine Control Module (ECM) has detected an erratic or irrational signal from the secondary crankshaft position sensor, indicating a mismatch with the camshaft position or expected timing.