The DPF pressure signal drops in and out, usually because of wiring that flexes or heat-damaged insulation near the exhaust.
P2456 — also written P2456, P 2456, 2456 — is the OBD-II code for dpf pressure sensor circuit intermittent. Same code, same fix: this page covers every spelling of it.
P2456 is a emissions fault code, typically costing £60–£400 to put right in a UK garage.
What causes P2456?
- Chafed or heat-damaged wiring
- Loose connector
- Failing sensor
- Partially blocked pipes
How P2456 is fixed
- Wiggle-test the loom while watching live data
- Repair or reroute the wiring away from heat
- Replace the sensor
P2456 repair cost in the UK
Most P2456 repairs land between £60–£400 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Can you drive with P2456?
Yes.
Urgency: medium.