Code result
P2456
DPF Differential Pressure Sensor Circuit Intermittent
Moderate severity
What it means
The DPF differential-pressure sensor delivers an intermittent signal — usually a marginal connector or a chafed wiring section that breaks contact during temperature or vibration.
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
Connector intermittent
highOne of the most commonly reported causes for this code — check this first.
Wiring chafed against bracket
mediumA plausible cause — test and verify before replacing parts.
Harness routed against vibrating component
lowLess common, but worth ruling out after the more likely causes.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P2456 freeNo credit card required