U064C code meaning
Lost Communication With Hybrid/EV Battery Pack Current Sensor C
Network system Generic code U06xx codes Check engine light
What U064C means
A third pack current sensor, C, appears where a battery has parallel strings or a separate measuring point, for instance in a battery junction box, that each need their own current value. U064C means that this sensor no longer delivers its data frames to the battery controller. No manufacturer documents U064C or the place of sensor C publicly. Because the remaining sensors cannot see the current in the branch that C watches, the controller usually lowers the permitted current for the whole pack instead of guessing. CARB's energy storage provisions treat it as a monitored input. For an analog sensor C, P2BE4 to P2BE7 would cover the circuit. LEM offers its CAB sensors up to 1,500 A, which shows the current class involved.
U064C at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U064C
- Battery warning lamp
- Reduced power and slower charging
Common causes of U064C
- PossibleData or supply wiring of sensor C damaged
- PossibleCurrent sensor C failed
- Less likelyLoose connector at the battery junction box
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery current sensor cVehicle bus wiring
What each part of U064C means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 4C | The exact fault in that area. |
What to do next
- Note U064C 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 U064C
What does U064C mean?
U064C means "Lost Communication With Hybrid/EV Battery Pack Current Sensor C". A third pack current sensor, C, appears where a battery has parallel strings or a separate measuring point, for instance in a battery junction box, that each need their own current value. It is a generic code, so it means the same on every make.
Is it safe to drive with U064C?
Drive gently and only to a workshop. With U064C the car can go into limp mode (reduced power) to protect itself.
Will U064C fail an emissions test?
Yes, it can. U064C is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U064C to fix?
Difficulty: workshop only. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will U064C clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.