U3006 On Honda and Acura vehicles, U3006 is a network code set when a control module sees a power supply problem on its input power circuit (low voltage or an open circuit), with the suffix such as -13 or -16 showing which

Honda and Acura control module input power fault

U3006 in short

On Honda and Acura vehicles, U3006 means a control module sees an input power problem, such as low voltage (-16) or an open circuit (-13). Owners report stalling, idle stop failing to restart and several warning lights. Have a dealer test the power supply to the module soon, not just the battery.

A control module needs steady power and ground to talk on the network. When the supply drops or opens, the module stores U3006 with a suffix: owners report -13 for an open circuit and -16 for low voltage.

Reports cover the Accord, MDX and Pilot with warning lights for emissions, parking brake, VSA or SH-AWD, idle stop that does not restart the engine and stalling in traffic. One MDX owner confirmed the battery and alternator were fine, so a good battery does not rule the code out.

This page speaks only for Honda and Acura. A Jeep Wrangler bulletin summary for a 12-volt battery issue also lists U3006, but we have not sourced that meaning.

Pick your make

U3006 is a manufacturer-specific code: its meaning depends on who built the car.

Other makes: meaning not verified. Check with a scan tool that reads manufacturer definitions.

Most likely causes

  1. Power or ground supply problem at the module

    Supported by vehicle data
    Why it ranks here
    Owners report the -13 open and -16 low voltage suffixes, and one MDX owner had a good battery and alternator yet low voltage on the engine control module.
    What would change this
    Rises if voltage drops at the module during the fault. Falls if the module power tests stable.
    How to test the engine control module (ecm / pcm)

  2. Weak 12-volt battery or charging

    Possible — needs testing
    Why it ranks here
    A Jeep bulletin summary for a low-charge 12V battery lists U3006, but one MDX owner found the battery and alternator fine.
    What would change this
    Rises if the battery tests weak. Falls if the battery and charging test fine.

  3. Auto idle stop restart demand dropping voltage

    Possible — needs testing
    Why it ranks here
    An MDX owner saw U3006-16 with idle stop failing to restart, but no source says idle stop causes the code.
    What would change this
    Rises if the code appears right after idle stop events. Falls if it also appears without idle stop.

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 with a scan tool that shows the code suffix and note which module stores U3006.

    Low riskTool: scan tool that reads all modules

    • IfSuffix -16 (low voltage) is stored

      It meansCheck the battery, charging and power supply to that module.

      Go to step 2

    • IfSuffix -13 (open circuit) is stored

      It meansCheck the module power connector and fuse path.

      Go to step 2

  2. Test the battery, charging system and the power and ground supply to the reporting module, including the fuse and connector.

    Use cautionTool: multimeter

    Warning:Work with the engine off and the key out; keep metal tools away from battery terminals.

Symptoms

  • Engine stalls in traffic Gets more serious: stop and have it checked.
  • Auto idle stop does not restart the engine Gets more serious: stop and have it checked.
  • Warning lights for emissions, parking brake, VSA or SH-AWD
  • Check engine light with U3006 stored

Compare with: Check engine light with loss of power

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

  • Underhood fuse block (engine compartment fuse box):The module power supply passes through fuses; no source names a part for this code; labor varies; get a quote after diagnosis.

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

Compare used part prices on PartPriceGuide

On your vehicle

Honda

Acura

Jeep

  • 0810621Status unverified

    12V battery low charge

    2021wrangler · issued · NHTSA 10212493

    Test and possibly replace the 12V battery; U3006 is among the listed codes. Only the NHTSA summary was read.

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

  • U3003Manufacturer code: on Ford, Lincoln, Mazda and Honda, the module that stored it saw its battery supply voltage outside the allowed range, usually too low

    Same system Possible — needs testing

    U3003 is another Honda-group power and battery voltage code in this system.

  • U3000Manufacturer code: on Ford, Honda, Acura and Mazda, the module that stored it found a fault inside itself

    Same system Possible — needs testing

    U3000 is another control module code in the same system.

All Module network (CAN bus) communication codes

U3006 questions

My battery tested good, can U3006 still set?

Yes. One MDX owner reports U3006-16 low voltage on the ECM with a good battery and alternator, so the power supply to the module needs testing too.

Sources and review

  1. NHTSA complaint ODI 11666072: 2020 Acura MDX — NHTSA (owner complaint)
  2. NHTSA complaint ODI 11671500: 2019 Acura MDX — NHTSA (owner complaint)
  3. NHTSA complaint ODI 11752657: 2021 Honda Pilot — NHTSA (owner complaint)
  4. NHTSA complaint ODI 11442364: 2018 Honda Accord — NHTSA (owner complaint)
  5. Jeep 0810621 (NHTSA 10212493): 12V battery low charge — NHTSA (manufacturer communication)
Last reviewed
Written by
Saurabh K.
Editorial review
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Technician review
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This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error

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