U04B3Invalid Data Received From Planetary Gear Set Control Module
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Several hybrid transmissions use planetary gear sets whose shift elements are switched to change the operating mode; two-mode hybrids, for example, combine two extra planetary sets with four clutches to move between electric, power-split and fixed-gear driving. Where a separate module controls such a set and reports its state, U04B3 marks messages from that module that arrive but carry implausible data. No manufacturer documents this code publicly, and SAE gives little more than the name. CARB 1968.2 counts transmission controllers among the emission-critical powertrain units and requires hybrid components to be monitored. U01B2 covers a module that no longer talks. Depending on design, the hybrid system may fall back to a limited mode with a warning light.
- What you may notice
- Hybrid system or transmission warning
- Reduced power or electric-only driving unavailable
- Likely causes
- PossiblePlanetary gear set control module or its position sensing faulty
- PossibleBus wiring or connector at the transmission damaged or oil-soaked
- RareSoftware of module and hybrid controller not matching
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.