OBD-II code · Network
U02A3 Lost Communication With Particulate Matter Sensor
The vehicle bus reports loss of communication with the particulate matter (PM) sensor (smart sensor with own ECU). DPF post-cat soot monitoring loses its primary feedback signal.
Is it safe to drive with U02A3?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyBus wiring open or shorted
- PossibleModule without power or ground
- PossibleModule failed
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Pm Sensor, Vehicle Bus Wiring
Related codes
- U02A0Invalid Data Received From Hybrid/EV Battery Interface Control Module D
- U02A1Lost Communication With NOx Sensor C
- U02A2Lost Communication With Reductant Quality Module
- U02A4Lost Communication With NH3 Sensor
- U02A5Lost Communication With Reductant Heater Control Module
- U02A6Lost Communication With Safety Integration Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.