What causes a P2502 code?

P2502 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 P2502 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2502 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

P2502

P2502 Charging System Voltage Information Error

What it means

The engine control module (ECM) or powertrain control module (PCM) has detected that the battery charging system output voltage is inconsistent with the commanded state.