U02C1Lost Communication With Hybrid/EV Electronics Coolant Pump C
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- U02C1 concerns the third networked pump of the electronics cooling loop, pump C, which has gone quiet on its data line. Vehicles with three such pumps assign them to different branches, and which branch pump C serves is the maker's choice; no manufacturer documents U02C1 publicly. Stellantis' 2024-2025 EV platform shows why the pumps must be kept apart: the units look and fit alike, yet each carries its own part number and software so the EVCU can address it on its own LIN bus, and only the position on the bracket and a symbol tell them apart (STAR S2508000056). Bosch markets electric pumps of this class for cooling power electronics in hybrid and electric cars. Under CARB 1968.2 a mute digital input needs its own fault code. If its branch overheats, power is reduced.
- What you may notice
- Warning for the electric drive or charging system
- Reduced power or charging rate under load or heat
- Cooling fans running hard
- Likely causes
- LikelyPump connector or LIN wire faulty
- PossibleLook-alike pumps swapped between positions during service
- PossiblePump electronics or motor failed
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.