Technical Service Bulletin (TSB)
Transfer Case Shift Motor Wire Harness Connector Not Secured
REFERENCE:

VEHICLES
AFFECTED:

TSB: 08-237-23
GROUP: 08 - Electrical

Date:

November 2, 2023

2023 (DS) RAM 1500 Pickup
This bulletin applies to vehicles built on or after June 16, 2023 (MDH
0616XX) and on or before June 24, 2023 (MDH 0624XX).

REVISION:

–

MARKET APPLICABILITY:

NA

MEA

SA

IAP

EE

CH

CUSTOMER
SYMPTOM:

Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the
technician may find that one or more of the following Diagnostic Trouble Codes (DTCs) have been set:
• U0418-00 - Implausible Data Received From Brake System Control Module.
• C1444-98 - T-Case Motor Overuse-Component or System Over Temperature.
• C00A8-13 - 4WD/AWD Transfer Case Unit Actuator Position Sensor B-Circuit Open.
• C00A7-13 - 4WD/AWD Transfer Case Unit Actuator Position Sensor A-Circuit Open.
• C149E-64 - Transfer Case Motor Position Sensor-Signal Plausibility Failure.
• C1423-64 - Transfer Case Internal Performance-Signal Plausibility Failure.
• C1406-13 - Transfer Case Brake Control-Circuit Open.
• C1477-4B - Transfer Case Clutch-Over Temperature.
• C140A-13 - Transfer Case Motor Control-Circuit Open.
• U041E-00 - Invalid Data Received From All Wheel Drive Control Module.
• U0422-00 - Implausible Data Received From Body Control Module.
• U0418-00 - Implausible Data Received From Brake System Control Module 1.
• U041E-00 - Invalid Data Received Form All Wheel Drive Control Module.
• U0403-00 - Implausible Data Received From T-Case.
The customer may also comment on the following:
• 4WD Service light displayed in the Instrument Panel Cluster (IPC).

CAUSE:

Connector not fully seated.

This Technical Service Bulletin (TSB) has also been released as a Rapid Service Update (RSU) 23-303, date of issue
November 02, 2023. All applicable RSU VINs have been loaded. To verify this RSU service action is applicable to the
vehicle, use VIP or perform a VIN search in DealerCONNECT/Service Library. All repairs are reimbursable within the
provisions of warranty. This RSU will expire 18 months after the date of issue.

REPAIR SUMMARY:
This bulletin involves performing a push–pull–push test on the transfer case shift motor wire harness connector.
CLAIMS DATA:
Labor Operation No:

Labor Description

Skill Category

Labor Time

08-91-CF-91

Perform Push-Pull Test on
Transfer Case Shift Motor
Electrical Connection
(2 - Skilled)

6 - Electrical and Body
Systems

0.3 Hrs.

Failure Code

ZZ

Service Action

08-237-23

-2-

RELATED LOP:
Labor Operation No:

Labor Description

Skill Category

Labor Time

08-91-CF-60

Transfer Case Skid-Plate
Equipped
(2 - Skilled)

6 - Electrical and Body
Systems

0.1 Hrs.

DIAGNOSIS:
Using a Scan Tool (wiTECH) with the appropriate Diagnostic Procedures available in DealerCONNECT/ Service
Library, verify all related systems are functioning as designed. If DTCs or symptom conditions, other than the ones
listed above are present, record the issues on the repair order and repair as necessary before proceeding further
with this bulletin.
If a customer’s VIN is listed in VIP or your RSU VIN list, perform the repair. If any vehicle not on the VIN list exhibits
any of the symptom listed above in the customer symptom section, perform the Repair Procedure.
SPECIAL TOOLS/EQUIPMENT:
Description

Ref. No.

Notes

wiTECH or Equivalent

–

–

REPAIR PROCEDURE:

1.

2.

3.

4.

5.
6.

Raise and support the vehicle. Refer to the detailed service procedures available in
DealerCONNECT/Service Library under: Service Info>04 - Vehicle Quick Reference / Hoisting /
Standard Procedure.
Remove the transfer case skid plate, if equipped. Refer to the detailed service procedures
available in DealerCONNECT/Service Library under: Service Info>13 - Frame and Bumpers /
Under Body Protection / Plate, Skid / Removal.
Perform a push–pull–push test on the transfer case shift motor wire harness connector Fig. 1 to
verify the connector is fully seated.

Fig. 1
Transfer Case Shift Motor Wire Harness Connector
Install the transfer case skid plate, if equipped. Refer to the detailed service procedures available
in DealerCONNECT/Service Library under: Service Info>13 - Frame and Bumpers / Under Body
Protection / Plate, Skid / Installation.
Lower the vehicle.If DTCs return, further diagnosis should be performed.
Clear all DTCs that may have been set.

-3-

08-237-23

POLICY:
Reimbursable within the provisions of the warranty.
This bulletin is supplied as technical information only and is not an authorization for repair. No part of this publication
may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical,
photocopying, or otherwise, without written permission of FCA US LLC.