What causes a P2252 code?

P2252 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 P2252 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2252 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

P2252

O2 Sensor Negative Current Control Circuit Low (Bank 1 Sensor 1)

What it means

The Engine Control Module detects a voltage drop below the calibrated threshold on the oxygen sensor's pump current circuit. This affects the precision of air-fuel ratio adjustments required for emissions control.