U3526 code meaning
High Voltage System Interlock Circuit G Performance
Network system Generic code U35xx codes Check engine light
What U3526 means
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.
U3526 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U3526
- Start-up of the high-voltage system aborted
- Communication codes in other control units at the same time
Common causes of U3526
- 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
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hvil loop g
What each part of U3526 means
| U | Network system: communication between the control modules (CAN bus). |
| 3 | Reserved range, usually generic. |
| 26 | The exact fault in that area. |
What to do next
- Note U3526 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U3526
What does U3526 mean?
U3526 means "High Voltage System Interlock Circuit G Performance". U3526 reports an implausible result for loop G. It is a generic code, so it means the same on every make.
Is it safe to drive with U3526?
Drive gently and only to a workshop. With U3526 the car can go into limp mode (reduced power) to protect itself.
Will U3526 fail an emissions test?
U3526 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U3526 to fix?
Difficulty: workshop only. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will U3526 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.