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U0337 Software Incompatibility With Battery Charger Control Module A

Check engine lightUsually off
EmissionsRelevant
Drive cycleNot required
Limp modeNo

Battery charger control module A is the charger built into a plug-in car: it turns mains AC into DC for the traction battery and coordinates with the charging station and the battery controller. U0337 appears when a partner module refuses the charger's software or calibration. No manufacturer documents U0337 publicly. Maserati updates the OBCM software on 2025 GranTurismo and Grecale electric models because a charging fault could only be cleared by unplugging and reconnecting (Rapid Update 751). FCA's bulletin 08-048-14 for the 2013–2014 Fiat 500e updated charger, vehicle control unit, inverter and battery controller together, partly to cut 12 V drain on incompatible charging stations. CARB expects plug-in hybrids to monitor charging performance. U019B is lost contact, U049C invalid data. Charging may stop.

Likely causes

On-board charger left on an older software level after other modules were updated
Charger replaced without programming to the vehicle
Charger update interrupted, for example by low 12 V supply

Symptoms

  • Charging does not start or stops after a short time
  • Charging fault message that clears only after replugging
  • 12 V battery drained after charging sessions

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–1,500
Time0.5–3 h

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

Parts involved

on board charger

Related codes

U019BU049CU01BB

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.