U3526High Voltage System Interlock Circuit G Performance
- Generic OBD-II code · Network
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- U3526 reports an implausible result for loop G. Not every interlock is a wire loop: Rivian patented a virtual interlock in which a controller first brings the DC bus up to a low, safe voltage only, gathers the voltages that the high-voltage components report over CAN, and raises the bus to operating voltage only if those reports are acceptable. With such a scheme a performance fault means values that contradict each other rather than a broken wire, for example one component seeing a bus voltage far from the battery's. No maker documents U3526. Missing or stale CAN data, a faulty voltage sensor or a loose HV plug are the main suspects.
- What you may notice
- Start-up of the high-voltage system aborted
- Communication codes in other control units at the same time
- Likely causes
- PossibleVoltage sensing inside one high-voltage component faulty
- PossibleVoltage message missing or late on the CAN bus
- PossibleHV plug not fully seated, so one component sees no bus voltage
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.