Engine-Codes - Lexus - P0B31 LEXUS

P0B31 LEXUS Code - Hybrid Battery 'D' Voltage Low

- Code Popularity: 787 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the P0B31 LEXUS Code?

  • Faulty Battery smart unit
  • Faulty HV battery assembly

|How to Fix the P0B31 LEXUS Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|What is the cost to diagnose the P0B31 LEXUS code?

Labor: 1.0

The cost to diagnose the P0B31 LEXUS code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are P0B31 LEXUS code possible symptoms?

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

|What Does the P0B31 LEXUS Code Mean?

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).

Hybrid Battery 'D' Voltage Low

|Need more information with the P0B31 LEXUS code?

Need more information on how to fix the P0B31 LEXUS code?
Get Access to Factory Service Manuals

|Need help with a P0B31 LEXUS code?

Get the p0b31 lexus code diagnosed by a professional: Find a repair shop in your area