What causes a P2515 code?

P2515 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 P2515 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2515 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

P2515

P2515 A/C Refrigerant Pressure Sensor B Circuit

What it means

The Engine Control Module (ECM) has detected an electrical fault or out-of-range signal from the secondary air conditioning refrigerant pressure sensor circuit. This sensor monitors high-side pressure to control fan engagement and compressor protection.