What causes a P1057 code?

P1057 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 P1057 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1057 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

P1057

APSPD P3 (exhaust air pressure before turbine) sensor plausibility fault (low threshold)

What it means

The engine control module (ECM) has detected that the Exhaust Back Pressure (EBP/APSPD) sensor reading is lower than the expected threshold compared to ambient or boost pressure sensors, indicating an inaccurate signal or a physical leak.