What causes a P2067 code?

P2067 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 P2067 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2067 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

P2067

Reductant Quality Sensor Circuit Low

What it means

The Engine Control Module (ECM) or Aftertreatment Control Module (ACM) detects a low voltage signal from the DEF quality sensor, indicating a circuit malfunction or sensor failure.