P0B24 The hybrid or EV battery computer sees the voltage of the high-voltage battery jump around when it should be steady

Hybrid battery voltage unstable

P0B24 in short

P0B24 means the hybrid or EV battery computer sees the voltage of the high-voltage battery pack "A" unstable. Jeep bulletins cover it on Wrangler 4xe and Grand Cherokee 4xe with a software update, and Ford has a bulletin for 2025 Mustang Mach-E. Owners report shutdowns in traffic, so get it checked soon.

The battery computer watches the voltage of the high-voltage pack. P0B24 sets when that reading is not steady enough compared with what the computer expects, which can come from software, the voltage sensing, or the pack itself.

Jeep and Chrysler bulletins 08-079-24 (2022 Wrangler 4xe) and 08-006-25 (2022 Grand Cherokee) list P0B24-00 with several battery codes and update the BPCM software. Ford TSB 25-2414 covers a wrench indicator with P0B24 on 2025 Mach-E with the extended range battery and points to BECM software. We read only the bulletin summaries.

Owner complaints show the code on a 2019 Fusion Energi, where Ford said it had no fix, and on a 2021 Wrangler that shut down in traffic.

The battery is a high-voltage system. Orange cables and connectors are not for owners to touch. Diagnosis belongs with a dealer or a trained technician.

Most likely causes

  1. Battery pack control module software (Wrangler 4xe, Grand Cherokee 4xe)

    Supported by vehicle data
    Why it ranks here
    Jeep bulletins 08-079-24 and 08-006-25 list P0B24-00 among battery codes and fix them with a BPCM software update; we read only the summaries.
    What would change this
    Rises on a covered Jeep with a MIL and several battery codes. Falls if the software is already current.

  2. Battery energy control module software (Mustang Mach-E)

    Supported by vehicle data
    Why it ranks here
    Ford TSB 25-2414 says P0B24 with a wrench indicator on 2025 extended range Mach-E may be due to the BECM software level.
    What would change this
    Rises on a covered 2025 Mach-E. Falls if the software is already current.

  3. Battery pack or voltage sensing fault

    Possible — needs testing
    Why it ranks here
    Complaints on a Fusion Energi and a Wrangler store P0B24 with shutdowns and no software fix; the Ford dealer reported no repair, so the cause needs testing.
    What would change this
    Rises if no bulletin applies and the pack fails the maker tests. Falls if a software update clears the code.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read all stored codes and freeze-frame data with a scan tool and note every dashboard message. Do not open or unplug anything.

    Low riskTool: OBD-II scan tool

    • IfP0B24 is stored on a Wrangler 4xe, Grand Cherokee 4xe or Mach-E

      It meansA maker bulletin may apply.

      Go to step 2

    • IfIt is stored on any other hybrid or EV

      It meansThe maker diagnosis decides.

      Go to step 3

  2. Give the VIN to a dealer and ask for open bulletins, recalls and software updates for the battery pack control module or BECM.

    Low riskTool: VIN lookup at a dealer

  3. Have a dealer or trained technician check the pack voltage readings and the battery computer using the maker service information.

    Best left to a shopTool: factory scan tool and high-voltage safety equipment

    Warning:High voltage: the battery pack, junction box, inverter and orange cables carry hundreds of volts that can kill. Do not unplug, probe or touch them. This work needs a hybrid or EV trained technician who makes the system safe first.

Symptoms

  • Hybrid battery or powertrain warning light
  • Vehicle shuts down while driving Gets more serious: stop and have it checked.
  • Rough shifting or inconsistent braking
  • Check engine light

How to fix

This is a safety-critical system, so we explain the code but don't give repair steps. Have it inspected by a qualified technician.

Parts and cost context

  • Battery pack control module software update (Jeep) or BECM software (Ford):Often a software job. Check the bulletins for your VIN before paying. Labor varies; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Jeep

  • 08-079-24 REV. AStatus unverified

    BPCM updates for P0B24-00 and other battery codes

    2022wrangler · issued · NHTSA 11011924

    Updates the battery pack control module software.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 08-006-25Status unverified

    BPCM diagnostic and system updates

    2022grand-cherokee, grand-cherokee-l · issued · NHTSA 11013008

    Updates the BPCM software for a MIL with P0B24-00 and other battery codes.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Ford

  • TSB 25-2414Status unverified

    Wrench indicator with P0B24 (extended range battery)

    2025mustang-mach-e · issued · NHTSA 11022407

    May be due to BECM software level.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

No curated relationships for P0B24 yet.

All Hybrid and electric drive codes

P0B24 questions

Is it safe to drive with P0B24?

Only to get it checked, and only if it drives normally. If the hybrid battery warning appears or the vehicle shuts down, stop somewhere safe and arrange a tow.

Can a software update fix P0B24?

On some Jeep 4xe and 2025 Mach-E models, yes: the maker bulletins call for a battery computer software update. Give the VIN to a dealer to check.

Sources and review

  1. 08-079-24 Rev A: BPCM updates (Wrangler 4xe) — FCA US ,
  2. NHTSA complaint ODI 11565655: 2019 Ford Fusion Energi — NHTSA Office of Defects Investigation
  3. NHTSA complaint ODI 11593530: 2021 Jeep Wrangler — NHTSA Office of Defects Investigation
  4. P0B24 Hybrid Battery "A" Voltage Unstable — Troublecodes.net
  5. 08-006-25: BPCM diagnostic and system updates (Grand Cherokee) — FCA US ,
  6. TSB 25-2414: wrench indicator with P0B24 on the Mach-E — Ford Motor Company ,
Last reviewed
Written by
Saurabh K.
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