What causes a P1162 code?

P1162 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 P1162 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1162 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

P1162

TCO1 message vehicle speed out of range fault

What it means

The Transmission Control Module (TCM) is receiving a vehicle speed signal via the J1939 data link that is outside of the plausible operating range or inconsistent with other sensor data.