What does code P2D1D mean?

Q: What does code P2D1D mean?

Reductant System Leak Detected – Small Leak. P2D1D indicates that the powertrain control module has detected a small leak in the diesel exhaust fluid (DEF) reductant system, typically by monitoring the selective catalytic reduction (SCR) system's ability to maintain pressure or by using a leak-detection routine. The code is set when the leak rate exceeds a calibrated threshold but is not large enough to trigger a gross-leak code, pointing to a minor breach in the tank, lines, injector, or pump seals.

DTC codes / P2Dxx · Hybrid propulsion / P2D1D

P2D1DReductant System Leak Detected – Small Leak

P2D1D indicates that the powertrain control module has detected a small leak in the diesel exhaust fluid (DEF) reductant system, typically by monitoring the selective catalytic reduction (SCR) system's ability to maintain pressure or by using a leak-detection routine. The code is set when the leak rate exceeds a calibrated threshold but is not large enough to trigger a gross-leak code, pointing to a minor breach in the tank, lines, injector, or pump seals.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.