Code result
P2371
Fuel Volume Regulator B Control Circuit Performance
Moderate severity
What it means
The ECU sees implausible feedback on the control loop for fuel volume regulator B - duty cycle does not match measured rail pressure response. The regulator either reacts too slowly, sticks, or has shifted from its calibration.
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
Regulator stem sticking due to debris or wear
highOne of the most commonly reported causes for this code — check this first.
High-pressure pump wear changes regulator response
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 P2371 freeNo credit card required