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U064C Lost Communication With Hybrid/EV Battery Pack Current Sensor C

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Data or supply wiring of sensor C damaged
Current sensor C failed
Loose connector at the battery junction box

Symptoms

  • Battery warning lamp
  • Reduced power and slower charging

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–2,000
Time1–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hv battery current sensor cvehicle bus wiring

Related codes

U064AU064BP2BE4P2BE5P2BE6P2BE7

References: law.cornell.edu, lem.com.