U064ALost Communication With Hybrid/EV Battery Pack Current Sensor A
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Battery management needs the pack current to count charge in and out and to judge state of charge and state of health. Many packs measure it with a self-contained sensor that sends its value over CAN; LEM's CAB series, for example, transmits on high-speed CAN at 500 kbit/s and is built for ASIL C. U064A records that current sensor A has stopped sending, while an analog sensor would report wiring faults via P0ABF to P0AC3. No manufacturer documents U064A publicly. CARB 1968.2 (e)(15.2.3)(A)(iv) requires the electronic inputs of the energy storage system to be monitored, which on hybrids points to a lit MIL. Without a current value the battery controller cannot track charge and normally restricts charging and discharging sharply.
- What you may notice
- Hybrid or EV battery warning, on hybrids also the MIL
- Strongly reduced drive power or charging refused
- Implausible state-of-charge display
- Likely causes
- PossibleCAN, supply or ground wiring of sensor A inside or at the pack damaged
- PossibleCurrent sensor A failed
- PossibleMoisture or corrosion at the pack's low-voltage connector
- RareBattery energy control module fault or software
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.