What causes a P1163 code?

P1163 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 P1163 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1163 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

P1163

Transmission output shaft speed out of range

What it means

The Transmission Control Unit (TCU) has detected that the signal from the Output Shaft Speed sensor is inconsistent with the engine speed and input shaft speed, or is sending values that are physically impossible for the current gear ratio.