P0B49 - Hybrid Battery Voltage Sense 'C' Circuit Intermittent/Erratic

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Battery smart unit
  • Faulty HV battery assembly

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0b49 Description

The HV battery uses nickel metal-hydride batteries and does not require external charging. The power management control ECU controls the SOC (state of charge) of the HV battery at a constant level during driving. The HV battery is composed of 28 modules, and each module consists of eight 1.2 V cells in series. The battery smart unit monitors battery block voltage at 14 locations. Each battery block is composed of 2 modules in a set. The battery smart unit, which monitors the voltage of the battery blocks, determines that malfunction has occurred if a voltage difference between the battery blocks exceeds the standard. When the malfunction detection condition is satisfied, the power management control ECU (HV CPU) will illuminates the Malfunction Indicator Lamp (MIL) and set a Diagnostic Trouble Code (DTC).
OBDII Code P0b49 - Hybrid Battery Voltage Sense 'C' Circuit Intermittent/Erratic - AutoCodes.com

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