Network, generic

U0597 Invalid Data Received From AC/DC Converter Control Module A

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

In plug-in hybrids and electric cars the AC/DC converter is normally the on-board charger: it rectifies mains power and controls the current into the traction battery. CARB requires plug-in hybrids to detect charger faults that stop charging or reduce its rate. U0597 is logged when the charger's messages about state, voltage or current fail validation at the battery or vehicle controller. Public maker texts for U0597 are missing; the partner U0296 is documented by Volvo, whose 2022-on XC60 and XC90 plug-in hybrids store BCM2-U029600 together with an ESC warning and a blocked pure electric mode when a third-party dongle or Y-splitter loads the diagnostic connector. Interference of that kind can just as well corrupt data, so check for such devices first.

Likely causes

Third-party dongle or Y-splitter on the diagnostic connector disturbing the bus (Volvo TJ 36559)
On-board charger electronics faulty or overheated
Charger or battery controller software out of date

Symptoms

  • AC charging stops or runs at reduced rate
  • Electric-only mode unavailable on plug-in hybrids
  • Warning lamps such as ESC or check engine

Repair estimate

DifficultyHardWorkshop job
Parts and labour€0–2,500
Time0.3–3 h

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

Parts involved

ac dc converter module a

Related codes

U0296U0598

References: static.nhtsa.gov, law.cornell.edu, patents.google.com.