U3541High Voltage System Interlock Circuit O
- Generic OBD-II code · Network
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- U3541 denotes trouble on interlock circuit O, the fourteenth loop. What happens next may depend on the operating state. Tesla's 2013 HVIL diagnostic guide for the Model S, published through NHTSA, splits the reaction: in the modes Standby, Support and Charge the battery management stores a fault and opens the contactors, or leaves them open if they already are, whereas in Drive it only raises a warning so that the car does not lose propulsion. A loop O fault that occurs on the move may thus first be noticed as a car that will not restart after parking. No maker documents U3541 or the parts of loop O.
- What you may notice
- Warning while driving without loss of drive
- No ready mode after the vehicle was switched off
- Charging refused
- Likely causes
- LikelyConnector in loop O not fully latched
- PossibleLoop O wiring damaged
- RareInternal fault in an HV component on loop O
- Repair
- Hard · Usually a job for a workshop.Typical cost: €60 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.