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U05A3 Invalid Data Received From Reductant Quality Module

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Dosing control unit software misreading the module (FCA reflash)
Quality sensor fouled by crystals or contaminated fluid
Corroded connector at the DEF tank sender

Symptoms

  • Check engine light and DEF warning
  • Reductant consumption faults stored alongside
  • Possible speed or restart limitation if not fixed

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,200
Time0.3–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

reductant quality module

Related codes

U02A2U030CP207F

References: static.nhtsa.gov, ssi-sensors.com, fordservicecontent.com, law.cornell.edu.