Code result
P20EF
Reductant Injection Valve Performance
High severity
What it means
The SCR reductant injection valve does not deliver the commanded amount of reagent. Causes include clogging by urea crystals, electrical faults or incorrect spray pattern.
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
Urea crystals in dosing valve
highOne of the most commonly reported causes for this code — check this first.
Electrical fault in dosing valve
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 P20EF freeNo credit card required