U033FSoftware Incompatibility With Hybrid/EV Battery Interface Control Module F
- Generic OBD-II code · Network
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Public documents name no vehicle that uses U033F, nor a pack with exactly six interface boards; F is simply the sixth address in the row. What is documented is how strictly battery software must follow the hardware. Hyundai's bulletin 18-HC-003 requires a BMS parameter update whenever a replacement lithium battery is installed in a 2011–2015 Sonata Hybrid or a 2015–2017 Tucson Fuel Cell. FCA cured P1A29, a failure of cell supervisory circuit A on the 2026 RAM 1500 eTorque, with new battery pack control module software (08-282-26); owners had noticed limp-home mode and a disabled stop/start. CARB 1968.2 counts cell voltage sensing among the hybrid inputs OBD must watch. U01A5 and U04A6 are F's partners.
- What you may notice
- Limp-home mode or reduced electric power
- Stop/start or electric assist disabled
- Battery or hybrid warning after battery service
- Likely causes
- LikelyBattery parameters not updated after a pack or module replacement
- PossibleBoard F taken from another pack with a different software level
- RareBattery controller on an outdated calibration
- Inspection (ITP)
- Can matter for the ITP: it concerns the emissions system.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €60 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.