U05A4Particulate Matter Sensor Received Invalid Data From ECM/PCM
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- A diesel particulate matter sensor has its own control unit, which needs engine controller data to run its measuring and burn-off cycles. U05A4 is reported when that unit cannot accept what the engine controller sends. FCA lists it in bulletins 18-008-23 (2019 Jeep Compass with 1.6 or 2.0 L diesel) and 18-010-23 (2020 Compass 1.6): with the MIL on, U05A4 may appear among many PM sensor P-codes and U02A3, and the cure is new PCM software; only P2002 calls for a new filter and sensor. CARB 1968.2 requires PM sensor faults to be caught before the sensor stops being usable for filter monitoring. U04A4 is the reverse direction, U02A3 total silence. Expect a MIL and an incomplete filter test, with normal driving.
- What you may notice
- Check engine light on
- Several particulate matter sensor codes stored at once
- Particulate filter monitor not completing
- Likely causes
- LikelyEngine controller software issue (FCA PCM update)
- PossibleDamaged CAN or supply wiring to the PM sensor unit
- RarePM sensor control unit faulty or wrong variant
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.