What causes a P1161 code?

P1161 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 P1161 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1161 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

P1161

Rear Axle RH Wheel Speed out of range fault

What it means

The ABS control module has detected that the signal frequency from the Right Hand Rear Axle wheel speed sensor is inconsistent or jumping outside of expected parameters compared to other wheel speeds.