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

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

Detailed page for trouble code U064C.

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U064C

Generic U — Network/User

Lost Communication With Hybrid/EV Battery Pack Current Sensor C

Brand: Generic
Type: U — Network/User
Views: UK: 16 EN: 29 RU: 19
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Page language: EN

Causes

  • Open, short, or high-resistance wiring between the battery pack current sensor C and the vehicle network
  • Corroded, bent, or pushed-out connector pins at the sensor, battery pack, or gateway module
  • Faulty battery pack current sensor C (internal electronics or power supply failure)
  • Loss of power or ground to the sensor module
  • CAN bus physical faults (short to battery/ground, missing termination, excessive noise)
  • Faulty gateway/BCM/Hybrid Powertrain Control Module that routes or interprets the sensor messages

Symptoms

  • Malfunction Indicator Lamp (MIL) or hybrid system warning on instrument cluster
  • Hybrid system may enter limp/limited-power mode, reduced performance, or disable regenerative braking
  • Incorrect or missing battery pack current or state-of-charge (SOC) readings
  • Vehicle may not charge the traction battery or may prevent EV-only operation
  • Possible loss of certain hybrid/EV features and driveability complaints
  • DTC U064C stored in one or more control modules

What to check

  • Use an OEM-capable scan tool to read stored/freeze-frame data and verify U064C and any associated codes
  • Confirm the fault is repeatable; check whether code is permanent, pending, or intermittent
  • Inspect connectors and wiring for the battery pack current sensor C for corrosion, bent pins, water intrusion, or mechanical damage
  • Verify battery pack service disconnect is performed and follow HV safety procedures before any high-voltage work
  • With appropriate safety measures, check sensor supply voltage and ground at the connector per manufacturer spec
  • Monitor CAN bus traffic with a capable tool: confirm expected message IDs from the battery pack/current sensor and message frequency

Signal parameters

  • Presence and frequency of battery pack/current sensor C CAN messages (message ID and expected Hz)
  • CAN High and CAN Low voltages (idle values ~2.5 V each side, differential ~0 V idle, dominant ~1.5 V differential) — verify within spec
  • Supply voltage to the sensor/module (Vbat or accessory supply per vehicle spec)
  • Module ground voltage (near 0 V reference)
  • Battery pack current reported by sensor (amps) — compare to other available current measurements or expected values
  • Module status bits or error flags in the sensor/BMS message payload

Diagnostic algorithm

  1. Safety first: Review vehicle-specific HV safety procedures. Disable high-voltage system and wear PPE as required before accessing the battery pack or high-voltage connectors.
  2. Retrieve and record all stored and pending DTCs and freeze-frame data from all modules (BCM, BMS, inverter, gateway). Note timestamps and conditions.
  3. Using a manufacturer scan tool, attempt to communicate directly with the battery management/current sensor module. Verify whether the module appears on the network and if it reports status.
  4. Visually inspect connectors and wiring for sensor C at the battery pack and at any intermediate gateways. Repair any damaged connectors or pins and reseat connections.
  5. With HV safety procedures followed, restore low-voltage supply and backprobe the sensor connector to verify proper power and ground to the module. Replace fuses/relays if supply missing.
  6. Monitor CAN traffic with a scope or CAN analyzer: confirm the expected message ID for sensor C is present and at expected frequency. If absent, check wiring continuity to gateway and bus termination.
  7. Perform wiring continuity and resistance checks between sensor C connector and gateway/module pins (with power removed). Look for opens, shorts, or high resistance.
  8. Wiggle test wiring while monitoring CAN/messages to detect intermittent faults from wiring harness movement.
  9. If wiring, power, and ground are good but no messages from sensor C, consider replacing the battery pack current sensor C module or the sensor electronics per manufacturer guidance.
  10. After repair or replacement, clear codes, cycle power, and verify normal communication and that no new related DTCs set. Confirm hybrid system functionality and monitor for recurrence.
  11. If replacement does not restore communication, escalate to testing/replacing the gateway, BMS, or performing manufacturer-level diagnostics and software updates.

Likely causes

  • Damaged or disconnected connector at the battery pack current sensor C
  • Faulty sensor/module inside the battery pack (most common in pack-level failures)
  • CAN bus short or open between battery pack and gateway
  • Power supply fuse or relay to the sensor module blown or not supplying voltage
  • Faulty gateway or BMS that stops forwarding the sensor message

Fault status

⚠️ Status
Lost communication with Hybrid/EV Battery Pack Current Sensor C. The vehicle is not receiving valid CAN messages from this sensor/module. Hybrid system may limit function; inspection of wiring, connectors, sensor module, and CAN network required.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-3.5 hours

Similar codes

U064A U064B U064D U0100 U0073
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