C00A6 AWD module actuator fault, front axle disconnect or transfer case actuator (Ford and Lincoln)

C00A6 front axle disconnect / AWD actuator fault

Severity not verified — if the car runs badly, have it inspected

The sources describe the lamps and repairs but give no drive-safety guidance; one owner also lost driver-assist features, so have it checked.

It gets more serious if:

  • Stop: Steering assist is lost, the red brake lamp comes on, or the vehicle will not drive normally.

Source: how we rate severity

C00A6 in short

On 2020 and later Ford Explorer and Lincoln Aviator AWD models, C00A6 is an AWD module code tied to the front axle disconnect actuator. Ford bulletins list a failed actuator or intermediate shaft, rubbed wiring and a contaminated speed sensor. Expect a wrench lamp and rear-drive only operation.

The AWD module controls actuators that connect the front axle and the transfer case. C00A6 is stored when one of those actuators or its circuit misbehaves, and a suffix such as :07 or :71 narrows the failure type.

Ford TSB 23-2174 (superseded by TSB 25-2373 and 25-2568) blames the front axle disconnect actuator or intermediate shaft for a wrench lamp with C00A6 and/or C0631 on 2020-2021 AWD vehicles. Other Ford bulletins name wiring that rubs the heat shield near the transfer case actuator motor, an oil-contaminated front halfshaft speed sensor, and updated actuator pinpoint tests that may avoid replacing the clutch actuator.

Owners report Service AdvanceTrac, 4WD Fault and Pre-Collision Assist messages along with the wrench lamp, and rear-wheel-drive only operation. This page only covers these Ford and Lincoln models.

Pick your make

C00A6 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. Front axle disconnect actuator or intermediate shaft

    Supported by vehicle data
    Why it ranks here
    Ford TSB 23-2174 (and its successors) names it for C00A6 and/or C0631 on 2020-2021 AWD Explorer and Aviator, and NHTSA complaints describe the same repair.
    What would change this
    Rises if the vehicle is within the bulletin build dates with a wrench lamp. Falls on later builds or when the actuator tests normal.

  2. Wiring rubbed near the transfer case actuator

    Supported by vehicle data
    Why it ranks here
    Ford SSM 50504 and SSM 52152 name a harness rubbing the underbody heat shield for C00A6:71, :74 and :99.
    What would change this
    Rises if the harness shows rub damage. Falls if the harness is intact.

  3. Oil-contaminated front halfshaft speed sensor

    Possible — needs testing
    Why it ranks here
    Ford TSB 21-2270 names it for C00A6:07 with C0633 on early-build 2020 vehicles only.
    What would change this
    Rises on an early-build 2020 vehicle with oil at the sensor. Falls otherwise.

What to test first

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

  1. Ask a dealer to read the AWD module codes with their suffixes and check the bulletins for your build date; one bulletin changes the actuator pinpoint tests before parts are replaced.

    Best left to a shop

    Warning:The front axle disconnect repair needs underbody and driveline work and module reprogramming; leave it to a qualified shop.

Symptoms

  • Wrench lamp or AWD indicator on
  • 4WD Fault or Service AdvanceTrac message
  • Vehicle drives in rear-wheel drive only
  • Pre-Collision Assist or Hill Start Assist unavailable Gets more serious: stop and have it checked.

How to fix

On your vehicle

Ford

  • 2020–2021 · Explorer

    Supported by vehicle data

    Ford TSB 23-2174 and later versions cover C00A6 with C0631; four 2020 Explorer owners report the same pattern. Bulletin currency not verified.

  • TSB 23-2174 (ford)Status unverified

    Wrench lamp with C00A6 and/or C0631 on AWD vehicles

    2020–2021explorer · NHTSA 10240240

    Replace the front axle disconnect actuator/intermediate shaft with a revised shaft.

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

  • SSM 50504 (ford)Status unverified

    Stability and powertrain lamps with C00A8 and C00A6 sub-codes

    2020–2022explorer · NHTSA 10208148

    Inspect and repair a harness rubbing the heat shield near the transfer case actuator motor.

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

  • TSB 21-2270Status unverified

    C0633 and/or C00A6:07 in the AWD module

    2020explorer · NHTSA 10200745

    Replace the oil-contaminated front halfshaft speed sensor.

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

  • SSM 49669Status unverified

    AWD indicator with C00A6 sub-codes

    2020–2021explorer · NHTSA 10189567

    Use updated transfer case clutch actuator pinpoint tests before replacing the actuator.

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

Lincoln

  • TSB 23-2174 (lincoln)Status unverified

    Wrench lamp with C00A6 and/or C0631 on AWD vehicles

    2020–2021aviator · NHTSA 10240240

    Replace the front axle disconnect actuator/intermediate shaft with a revised shaft.

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

  • SSM 50504 (lincoln)Status unverified

    Stability and powertrain lamps with C00A8 and C00A6 sub-codes

    2020–2022aviator · NHTSA 10208148

    Inspect and repair a harness rubbing the heat shield near the transfer case actuator motor.

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

  • C0631Front axle disconnect actuator fault (Ford AWD)

    Shares causes Supported by vehicle data

    Ford TSB 23-2174 lists C00A6 with C0631 for the same front axle disconnect repair.

All Drivetrain, 4WD and AWD codes

C00A6 questions

What does C00A6 mean on a Ford Explorer?

An AWD module code tied to the front axle disconnect actuator, with a suffix giving the failure type.

Can I keep driving with C00A6?

Usually the vehicle drives as rear-wheel drive with warning lamps, but driver-assist features may be off, so have it checked soon.

Sources and review

  1. Ford TSB 23-2174: wrench lamp with C00A6 and/or C0631 on AWD Explorer and Aviator (front axle disconnect actuator / intermediate shaft) — Ford via NHTSA
  2. NHTSA complaints ODI 11688028, 11723709, 11758573 and 11764430 (2020 Ford Explorer) — NHTSA ODI
  3. Ford SSM 50504: stability and powertrain lamps with C00A8, C00A6:71, :74 and :99 — Ford via NHTSA
  4. Ford TSB 21-2270: C0633 and/or C00A6:07 in the AWD module — Ford via NHTSA
  5. Ford SSM 49669: AWD indicator with C00A6 sub-codes (transfer case clutch actuator pinpoint tests) — Ford via NHTSA
Last reviewed
Written by
Saurabh K.
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