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DTC codes / U05xx · Network communication / U059B

U059BInvalid Data Received From Hybrid/EV Battery Pack Sensor Module

U059B is a communication fault where the vehicle's main control module receives invalid or corrupted data from the hybrid or electric vehicle battery pack sensor module over the controller area network (CAN) bus. The computer has detected that the sensor module is reporting values outside expected limits or sending malformed messages, so it cannot trust the battery data for hybrid system management.

SystemNetwork
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaNetwork communication

Symptoms you may notice

  • Illumination of the check engine light or hybrid system warning light
  • Often no symptoms besides the warning light, especially if the fault is intermittent
  • Reduced hybrid system performance or forced limp mode
  • Inaccurate or fluctuating state-of-charge or battery temperature readings on the dashboard
  • Failure of the vehicle to enter or maintain electric-only driving mode
  • Possible no-start condition if the battery pack sensor data is critical for system wake-up

Common causes, most likely first

  1. Faulty hybrid/EV battery pack sensor module (internal electronics or sensor failure)
  2. Damaged or corroded wiring or connectors between the battery pack sensor module and the CAN bus
  3. CAN bus communication disruption due to a shorted or open circuit in the data lines
  4. Low 12-volt auxiliary battery voltage causing unstable module operation
  5. Software or firmware issue in the battery pack sensor module requiring recalibration or update
  6. Water intrusion or physical damage to the battery pack sensor module or its harness
  7. Poor ground connection for the battery pack sensor module

How to diagnose and fix it

  1. Verify the 12-volt auxiliary battery condition and charge or replace it if voltage is low
  2. Inspect the battery pack sensor module harness and connectors for corrosion, damage, or loose pins
  3. Check CAN bus integrity with a multimeter or oscilloscope to rule out shorts or opens
  4. Retrieve all stored codes and freeze-frame data to see if other modules report related communication faults
  5. Perform a software update or recalibration of the battery pack sensor module if applicable
  6. Substitute a known-good battery pack sensor module to confirm the fault before replacement
  7. Clear codes and road-test the vehicle to verify the repair and ensure no repeat codes

When the battery sensor lies to the computer

  • A weak 12-volt battery often causes U059B because the battery pack sensor module may boot up incorrectly and send invalid data before stabilizing.
  • The code can be set by a momentary CAN bus glitch that leaves no permanent fault, so always check for intermittent wiring issues before condemning the sensor module.
  • Corrosion inside a connector that looks fine from the outside is a common culprit, especially in vehicles exposed to road salt or humidity.
  • U059B does not always mean the battery pack itself is failing; the sensor module is a separate component that can fail independently.
  • After replacing the sensor module, some vehicles require a learn or calibration procedure, and skipping it can cause the code to return immediately.

Can I keep driving with U059B?

You can usually drive the vehicle to a workshop, but avoid heavy acceleration or long trips because the hybrid system may enter a reduced-power mode without warning. If the vehicle feels sluggish or the hybrid system warning is flashing, stop driving and seek professional diagnosis.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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