What causes a P1195 code?

P1195 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 P1195 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1195 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

P1195

Rail pressure calibration medium range fault

What it means

The Engine Control Module (ECM) detected that the fuel rail pressure drifted beyond its calibrated 'medium range' setpoint during steady-state operation.