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U05A0 Invalid Data Received From Evaporative Emission System Leak Detection Control Module

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Some fuel systems hand the tank leak test to a separate module with its own pump, valve, pressure sensor and processor. Stoneridge patent US11773809 describes such a unit: it wakes hours after shutdown while the engine controller sleeps, runs the test alone and later passes pressure results over CAN or LIN, from which the OBD system decides on a fault code. U05A0 is set when those reports arrive but cannot be trusted, for example wrong length, counter or values. Ford's 2014 OBD code list shows it with the lamp indicator. CARB 1968.2 requires leak detection down to 0.020 inch on gasoline vehicles, so a module whose data are rejected leaves the EVAP readiness open. U029F means no messages at all, U030A a software mismatch. Driving is unaffected.

Likely causes

Leak detection module electronics or its pressure sensor failing
Corrosion at the module connector near the tank or canister
Module and engine controller software levels do not match

Symptoms

  • Check engine light on
  • EVAP readiness not set, emissions inspection may fail

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–600
Time0.5–2 h

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

Parts involved

evap leak detection module

Related codes

U029FU030AP0455P0456

References: performanceparts.ford.com, patents.google.com, law.cornell.edu.