P2456
DPF Differential Pressure Sensor Circuit Intermittent
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.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Symptoms
- Check engine light or DPF warning light on
- Power loss / limp mode
- Increased fuel consumption
- Failed forced regeneration attempts
Common causes
Ordered by how often each turns out to be the cause.
- Connector intermittentCommon
- Wiring chafed against bracketPossible
- Harness routed against vibrating componentLess likely
Parts involved
- DPF Differential Pressure Sensor
- DPF Pressure Sensor Wiring
P2456 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.