U0348Software Incompatibility With Hybrid/EV Battery Interface Control Module O
- Generic OBD-II code · Network
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- O stands for a fifteenth board; no public document links U0348 to a vehicle. That the software inside a cell monitoring unit can itself be the problem is shown by Honda's recall 15V602 of October 2015: in 6,786 Accord Hybrids of 2014–2015 the cell voltage sensor (CVS) could misread electrical noise from inverter and motor circuits, a side effect of a change made for digital TV reception in Japan, and switch the car into a fail-safe EV mode limited to about 40 mph, with the engine off. Dealers installed new hybrid system software, which Honda says does not affect emissions or fuel economy. Honda uses no letter codes for the CVS. U01AE flags a silent O, U04AF corrupted data.
- What you may notice
- Fail-safe mode with reduced speed and power
- Engine switched off, electric drive only until the battery is drained
- Hybrid warning with audible alert
- Likely causes
- LikelyFirmware of the monitoring unit itself faulty and superseded
- PossibleBoard O missed a released software update
- RarePack boards on different update levels after a partial repair
- Inspection (ITP)
- Can matter for the ITP: it concerns the emissions system.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €0 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.