C1477 Transfer case clutch over temperature (Jeep)

C1477-4B transfer case clutch over temperature, 4WD overheated message

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

Stellantis describes a 4WD Overheated Temporarily Unavailable message and a transfer case repair, but none of the sources say whether it is safe to keep driving, so no class is claimed.

Source: how we rate severity

C1477 in short

On Jeep, C1477-4B means the transfer case clutch is reporting an over-temperature condition. Stellantis bulletins link it to a 4WD Overheated Temporarily Unavailable message and a shift motor or connector problem on Wagoneer models. It is a four-wheel-drive fault; ask a dealer whether it is safe to keep driving.

The transfer case sends power to the front wheels through a clutch. When the control module decides that clutch is too hot, it sets C1477-4B and may show a message that 4WD is temporarily unavailable.

For 2022-2024 Wagoneer and Grand Wagoneer, Stellantis says the shift motor should be replaced when this code and C1444-98 set. A separate 2023 bulletin says a shift motor connector that is not fully seated can set it along with several other codes.

A 2018 Cherokee owner quotes C1477-4B with a clutch pressure sensor code from the drivetrain module, so the same wording is used on that model. No cause for the Cherokee is given in the sources read.

Pick your make

C1477 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. Transfer case active shift motor

    Supported by vehicle data
    Why it ranks here
    Stellantis bulletin 21-048-24 says the shift motor is replaced for C1477-4B with C1444-98 on Wagoneer and Grand Wagoneer. Only the NHTSA summary was read.
    What would change this
    Rises if the dealer confirms your VIN falls in the bulletin and the shift motor codes are present. Falls on other models, where no bulletin was found.

  2. Shift motor wire harness connector not secured

    Supported by vehicle data
    Why it ranks here
    Stellantis bulletin 08-122-24 lists C1477-4B among the codes caused by an unsecured connector on 2023 Wagoneer and Grand Wagoneer. It is checked before replacing the motor.
    What would change this
    Rises if the connector is loose when inspected. Falls if it is fully seated.

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 drivetrain codes, check the transfer case shift motor connector is fully seated, and check for open Stellantis bulletins on your VIN.

    Best left to a shopTool: dealer scan tool

    Warning:The transfer case is under the vehicle and its parts are heavy and hot. Leave this to a shop.

Symptoms

  • 4WD Overheated Temporarily Unavailable message
  • 4WD Service light
  • Check engine light

How to fix

On your vehicle

Jeep

  • 2022–2024 · Wagoneer

    Supported by vehicle data

    Stellantis names C1477-4B in a shift motor replacement bulletin and a connector bulletin.

  • 2022–2024 · Grand Wagoneer

    Supported by vehicle data

    Covered by the same two Stellantis bulletins as the Wagoneer.

  • 2018–2019 · Cherokee

    Supported by vehicle data

    Owner complaints from 2018-2019 Cherokee quote C1477-4B alongside C1440-64 from the drivetrain control module. No bulletin for the Cherokee was found.

  • 21-048-24Status unverified

    Transfer case active shift motor replacement

    2022–2024grand-wagoneer, wagoneer · issued · NHTSA 11006985

    Replace the transfer case shift motor for C1444-98 and C1477-4B with a 4WD Overheated Temporarily Unavailable message.

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

  • 08-122-24Status unverified

    Transfer case shift motor wire harness connector not secured

    2023grand-wagoneer, wagoneer · issued · NHTSA 11001210

    Check the shift motor connector is secure when one or more listed codes, including C1477-4B, set with the MIL on.

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

  • U0418A module received implausible data from the brake system (ABS) control module

    Shares causes Supported by vehicle data

    Stellantis bulletin 08-122-24 lists U0418 and C1477-4B together among the codes an unsecured shift motor connector can set on 2023 Wagoneer models.

All Drivetrain, 4WD and AWD codes

Sources and review

  1. Stellantis bulletin 21-048-24: transfer case active shift motor replacement (C1444-98, C1477-4B) — Stellantis (FCA US) via NHTSA ,
  2. Stellantis bulletin 08-122-24: transfer case shift motor wire harness connector not secured — Stellantis (FCA US) via NHTSA ,
  3. NHTSA complaint ODI 11729828 (2018 Jeep Cherokee, C1477-4B) — NHTSA Office of Defects Investigation (consumer complaint)
Last reviewed
Written by
Saurabh K.
Editorial review
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Technician review
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