Code result
P20E7
Reductant Injection Air Pressure Too High
Moderate severity
What it means
The DEF system air-assist pressure exceeds the upper threshold — pressure-control valve stuck closed or air pump runaway.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Pressure control valve stuck closed
highOne of the most commonly reported causes for this code — check this first.
Air pump does not regulate
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 P20E7 freeNo credit card required