Diesel Particulate Filter Pressure Sensor A Circuit Intermittent
Common Symptoms
- Check engine light illuminated
- Reduced engine power or derate
- Poor acceleration under load
- Intermittent engine performance issues
- Regeneration cycle may not complete properly
Most Likely Root Causes
- Damaged or corroded wiring harness to DPF pressure sensor
- Faulty DPF differential pressure sensor
- Poor electrical connection at sensor connector
- Intermittent short or open circuit in sensor wiring
- Water or debris contamination in sensor connector
Full step-by-step tests, DVOM guidance, and pinout data are available inside the AI Diesel Tech diagnostic session.
AI walks you through every test — one step at a time. Plans start at $12.95/mo.
Component Location
DPF differential pressure sensor is typically mounted on or near the diesel particulate filter assembly in the exhaust system.
Manufacturer Notes
This intermittent code often indicates a marginal electrical connection that fails under heat, vibration, or moisture exposure conditions.
Also diagnosing J1939 SPN/FMI codes?
Heavy-duty trucks often throw both OBD-II and J1939 faults simultaneously. AI Diesel Tech handles both protocols in a single guided session.
AI Diesel Tech — The Technician's Diagnostic Engine
AI Diesel Tech diagnostic logic is built by an ASE Certified Diesel Technician. Professional-grade OBD-II and J1939 fault analysis — trusted by technicians nationwide, used in shops, fleets, and training programs.
Get AI-Guided Diagnosis for P2456
The diagnostic engine walks you through every physical test — step by step, on your phone, at the truck.