What causes a P0240 code?

P0240 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 P0240 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0240 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

P0240

Turbocharger Boost Pressure Sensor B Circuit Range/Performance

What it means

The Engine Control Module (ECM) has detected an irrational signal from the secondary boost pressure sensor ('B') that does not match expected operating parameters or atmospheric pressure maps.