U0412 A module received invalid data from the battery energy control module, the computer that manages the high-voltage battery

Invalid data from battery energy control module A

U0412 in short

U0412 means a module received data it could not trust from the battery energy control module, which manages the high-voltage battery. On Chrysler Pacifica Hybrid and some other plug-in and mild hybrids it is often fixed with a battery module software update, but it can also point to a battery fault. Have a dealer check it soon.

Hybrids and plug-in hybrids have a battery energy control module (Chrysler calls it the battery pack control module) that reports the high-voltage battery state to the rest of the car. U0412 sets when another module receives a message from it that fails a validity check, not a total loss of contact.

Most reports come from the Chrysler Pacifica Hybrid. Chrysler has bulletins that reflash the battery pack module or hybrid control processor for U0412 on 2017-2019 Pacificas, and Ram has one for the 2025 ProMaster. Some owners still report loss of propulsion, and one dealer suspected the battery itself.

This is high-voltage territory, so there are no DIY steps beyond reading codes and asking about bulletins.

Most likely causes

  1. Battery pack control module or hybrid controller software

    Supported by vehicle data
    Why it ranks here
    Chrysler and Ram bulletins update the battery pack module or hybrid control processor for U0412, and dealers have flashed the module for it on a 2019 Pacifica and a 2019 Wrangler eTorque.
    What would change this
    Rises if your vehicle matches a bulletin and the module is not on the latest software. Falls if the code returns after the update.

  2. High-voltage battery fault

    Possible — needs testing
    Why it ranks here
    One Pacifica dealer reported a serious high-voltage battery problem with U0412 and P0BBE, and a Wrangler eTorque lost power days after a software flash for U0412 and P0A94.
    What would change this
    Rises if battery-related codes are stored with U0412 or the code returns after a software update.

  3. Wiring or connector fault on the data link

    Common general cause
    Why it ranks here
    Reference sources list corrupted network data and corroded or loose connectors as causes of invalid-data codes.
    What would change this
    Rises if other modules also report invalid or lost data. Falls if the network tests clean.

  4. Battery energy control module failure

    Common general cause
    Why it ranks here
    An internal fault in the module itself can send bad data.
    What would change this
    Rises only after software, wiring and the battery have been ruled out.

What to test first

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

  1. Have the codes read from every module, including the hybrid and battery modules, and note any battery-related codes.

    Low riskTool: scan tool that reads hybrid modules

    • IfU0412 alone or with U029A on a Pacifica Hybrid

      It meansCheck for a software bulletin.

      Go to step 2

    • IfU0412 with battery codes such as P0BBE or P0A94

      It meansThe battery may be involved; dealer diagnosis needed.

      Go to step 3

  2. Ask a dealer to check your VIN for battery pack module or hybrid controller software updates and open recalls.

    Low risk

  3. Have a dealer test the battery energy control module, its network wiring and the high-voltage battery.

    Best left to a shop

    Warning:High-voltage battery work can kill. Leave diagnosis and repair to a dealer or hybrid specialist.

Symptoms

  • Check engine light on
  • Sudden loss of propulsion, limp mode or Stop Safely message Gets more serious: stop and have it checked.
  • Battery warning 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 energy control module:Chrysler fixes several U0412 cases with software, so ask about updates first. Battery and module work is high-voltage and dealer-only. Labour 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

Chrysler

  • 2017–2018 · Pacifica

    Supported by vehicle data

    Chrysler 08-271-26: battery pack module update for U0412-00. Owners also report loss of propulsion with U0412. Whether the bulletin is still current is not verified.

  • 2019 · Pacifica

    Supported by vehicle data

    Chrysler 08-108-26 REV. A: hybrid control processor flash including U0412. Whether it is still current is not verified.

  • 08-271-26Status unverified

    Battery Pack Control Module update for U0412-00

    2017–2018pacifica · issued · NHTSA 11035046

    BPCM update for a MIL with U0412-00 invalid data from the battery energy control module.

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

  • 08-108-26 REV. AStatus unverified

    HCP/AHCP updates

    2019pacifica · issued · NHTSA 11033327

    Hybrid control processor flash; the code list includes U0412.

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

Ram

  • 2025 · ProMaster

    Supported by vehicle data

    Ram 08-167-26: battery pack module flash with P0D08 and U0412. Whether it is still current is not verified.

  • 08-167-26Status unverified

    Battery Pack Control Module updates

    2025promaster · issued · NHTSA 11031662

    BPCM flash; codes include P0D08 and U0412.

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

  • P0A94The hybrid system has detected a performance fault in the DC/DC converter inside the inverter assembly

    Shares causes Possible — needs testing

    A Jeep dealer found P0A94 and U0412 together on a Wrangler eTorque and flashed the battery pack control module.

All Module network (CAN bus) communication codes

U0412 questions

Is it safe to keep charging a Pacifica Hybrid with U0412?

Ask the dealer first and check for open recalls on your VIN. One owner reports that their recall notice advised not to recharge and to park outside until the repair was done.

Sources and review

  1. U0412: Invalid data received from Battery Energy Control Module A — FS1 Inc. blog
  2. Chrysler 08-271-26: Battery Pack Control Module update, U0412-00 (2017-2018 Pacifica) — FCA / NHTSA ,
  3. NHTSA complaint ODI 11678944: 2018 Chrysler Pacifica — NHTSA (owner complaint)
  4. NHTSA complaint ODI 11725453: 2021 Chrysler Pacifica — NHTSA (owner complaint)
  5. NHTSA complaint ODI 11756324: 2019 Chrysler Pacifica — NHTSA (owner complaint)
  6. NHTSA complaint ODI 11766716: 2019 Jeep Wrangler — NHTSA (owner complaint)
  7. Chrysler 08-108-26 REV. A: HCP/AHCP updates incl. U0412 (2019 Pacifica) — FCA / NHTSA ,
  8. Ram 08-167-26: Battery Pack Control Module updates, P0D08/U0412 (2025 ProMaster) — FCA / NHTSA ,
  9. NHTSA complaint ODI 11676038: 2019 Chrysler Pacifica — NHTSA (owner complaint)
  10. ASE L1 study guide: Network U-codes — Open Exam Prep
  11. NHTSA complaint ODI 11768339: 2017 Chrysler Pacifica — NHTSA (owner complaint)
  12. NHTSA complaint ODI 11701965: 2018 Chrysler Pacifica — NHTSA (owner complaint)
Last reviewed
Written by
Saurabh K.
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