U350CControl Module Cooling Fan Circuit/Open
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- U350C reports that the fan built into or attached to a control module draws no current, or its circuit is open, at the moment the module switches it on. Some electronics carry their own blower: on the 2021 Toyota RAV4 Prime the plug-in charger has a fan with a speed sensor (bulletin T-SB-0021-21, code P1CE931), and the central infotainment unit of the Karma Revero has one under a shroud (TB-24-94-01). For electrical parts that cool inverters and traction batteries, CARB requires circuit and function monitoring. No maker documents U350C itself. With the fan dead, the module heats up and may cut its own output, charge more slowly or shut down. Shorts are split off into U350D/U350E; U350F covers a fan that is wired correctly but runs wrong.
- What you may notice
- Module fan silent when it should run
- Module overheats, reduces output, charges slower or restarts
- Temperature warning or function message for the affected module
- Likely causes
- LikelyFan motor winding or brushes open
- PossibleFan plug loose or not latched after the module was removed
- PossibleBroken fan supply or control wire
- RareFan output stage inside the module failed open
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.