U0601Lost Communication With Particulate Filter Pressure Sensor A
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Particulate filter pressure sensor A measures the pressure drop across a diesel or gasoline particulate filter, the basis for soot load estimates and filter monitoring. Digital versions report over SENT. GM's 2025 diesel tables (25OBDG04A/B) call it differential pressure sensor loss of communication: it sets when the sensor reports an internal fault that shuts its SENT output, when 158 of 200 checks fail, or when no fresh message has come for over 12.5 s; it is Type A, so the MIL comes on in the first trip. Ford's 2023 diesel summary flags a SENT driver error or a line stuck high or low, and Ford's 2024 gasoline summary uses it for the filter sensors with 5 s to register. U0602, U0696 and U0697 cover sensors B to D.
- What you may notice
- Check engine light, on GM already in the first trip
- Filter regeneration may run on a model only or be blocked
- Reduced power on some diesels
- Likely causes
- LikelySENT line, 5 V supply or ground interrupted or shorted
- PossibleSensor internal fault switching off its output (heat, moisture)
- PossibleCorroded connector near the exhaust
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.