What causes a P0115 code?

P0115 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 P0115 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0115 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

P0115

Engine Coolant Temperature Circuit Malfunction (ECT)

What it means

The Engine Control Module (ECM) detects a signal voltage from the Coolant Temperature Sensor that is outside of the expected operating range, indicating a circuit failure.