Code result
P20E0
Reductant Pressure Too Low
High severity
What it means
The pressure in the SCR reductant (AdBlue/DEF) line is below the calibrated minimum. Without sufficient pressure the dosing module cannot atomise reagent properly, leading to NOx exceedence.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Worn DEF pump
highOne of the most commonly reported causes for this code — check this first.
Leak in DEF line
mediumA plausible cause — test and verify before replacing parts.
Clogged DEF filter
mediumA plausible cause — test and verify before replacing parts.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P20E0 freeNo credit card required