U034DSoftware Incompatibility With Vehicle Thermal Management Control Module
- Generic OBD-II code · Network
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The vehicle thermal management control module commands pumps, valves and fans that keep battery, drive electronics and cabin at their target temperatures. U034D means a partner controller rejects its software or calibration. No manufacturer documents U034D publicly. Audi shows that the software of this unit counts for OBD: on the 2020 Q5 hybrid, thermal management control module 00C5 judged normal temperature differences as faults, stored P0C4300 and P0CE100 and lit the MIL until campaign 80C9 updated it. Porsche reprograms the thermal management unit TME of the Taycan from 2020 together with the high-voltage heater to make cabin heating more robust (WPS9). CARB wants the electronic components that cool or heat hybrid battery and inverter monitored. U02AB is lost contact, U05AC invalid data. Heating, charging or power may be limited.
- What you may notice
- Weak cabin heating or cooling
- Charging or drive power limited to protect the battery
- Warning lamp with thermal or coolant codes stored
- Likely causes
- LikelyThermal management controller on an outdated software level
- PossibleThermal management module replaced without programming
- RareHigh-voltage heater or another partner updated without matching the thermal controller
- Inspection (ITP)
- Can matter for the ITP: it concerns the emissions system.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.