U0337Software Incompatibility With Battery Charger Control Module A
- Generic OBD-II code · Network
- Matters for the ITP
- How the car detects it
- 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.
- What you may notice
- 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
- Likely causes
- LikelyOn-board charger left on an older software level after other modules were updated
- PossibleCharger replaced without programming to the vehicle
- RareCharger update interrupted, for example by low 12 V supply
- Inspection (ITP)
- Can matter for the ITP: it concerns the emissions system.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.