Code result
P2037
Reductant Injection Air Pressure Sensor A Circuit
Moderate severity
What it means
A general electrical fault is reported on reductant injection air-pressure sensor A — used on air-assisted DEF dosing systems to monitor the atomisation air pressure delivered to the injector.
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
Air pressure sensor failed
highOne of the most commonly reported causes for this code — check this first.
Harness fault between sensor and PCM
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 P2037 freeNo credit card required