What causes a P102A code?

P102A 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 P102A code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P102A 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

P102A

Post Air Temperature BPV over range

What it means

The engine's Post Air Temperature sensor has detected that the air temperature downstream of the Bypass Valve (BPV) is higher than the maximum allowable limit, indicating an efficiency failure in the air cooling or bypass system.