OBD-II code · Powertrain (generic, extended)
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.
Is it safe to drive with P2456?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyConnector intermittent
- PossibleWiring chafed against bracket
- Less likelyHarness routed against vibrating component
Symptoms
- Check engine light or DPF warning light on
- Power loss / limp mode
- Increased fuel consumption
- Failed forced regeneration attempts
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Dpf Differential Pressure Sensor, Dpf Pressure Sensor Wiring
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.