What causes a P113B code?

P113B 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 P113B code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P113B 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

P113B

WRAF heater spi test fault

What it means

The Engine Control Module (ECM) or Aftertreatment Control Module (ACM) has detected a failure during the self-test of the Wide-Range Air-Fuel (WRAF) sensor's internal heater circuit.