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U0596 Invalid Data Received From AC/AC Converter Control Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

An AC/AC converter changes alternating current of one voltage or frequency into another without handing it to the battery first. In vehicles, such a stage can sit in a charger, for example a matrix converter that turns three-phase grid power directly into high-frequency AC for an isolating transformer, as in patent US9973107B2, or it can adapt power for on-board outlets. U0596 means the converter's controller sends status, current or temperature data that the receiving module refuses as implausible. No manufacturer documents U0596, and none names an AC/AC converter module in public service material, so the actual function depends entirely on the vehicle. Charging or outlet power is the most likely casualty; driving should not be affected.

Likely causes

Converter control electronics faulty or overheated
Converter and receiving module software not matched
Bus wiring to the converter damaged

Symptoms

  • Charging or outlet power interrupted
  • Warning about the charging or power system

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,500
Time0.5–3 h

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

Parts involved

ac ac converter module

Related codes

U0589U0597

References: patents.google.com, en.wikipedia.org.