U05A3Invalid Data Received From Reductant Quality Module
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- A reductant quality module checks that the tank holds proper diesel exhaust fluid, a 32.5 % urea solution. SSI's TULC sensor, for example, derives concentration from the speed of sound and reports it with level and temperature over J1939 CAN to the dosing control unit. This code means those reports arrive but are rejected. FCA documents it for the 2019 Jeep Cherokee 2.2 diesel (EMEA): bulletin 18-088-20 reprograms the dosing control unit when U05A3 appears with a MIL, often together with P20F4/P20F5 consumption faults. CARB 1968.2 demands that every input used by the low-quality inducement be monitored. Ford sets U02A2 when the module's messages are missing for 5 s. The driver may see a DEF warning, and inducement can follow if it persists.
- What you may notice
- Check engine light and DEF warning
- Reductant consumption faults stored alongside
- Possible speed or restart limitation if not fixed
- Likely causes
- LikelyDosing control unit software misreading the module (FCA reflash)
- PossibleQuality sensor fouled by crystals or contaminated fluid
- RareCorroded connector at the DEF tank sender
- 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 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.