NHTSA ID Number: 11020476
Manufacturer Communication Number: 2025FA09
TSB/Document Date: 2025-07-09
Summary
Announces customer satisfaction campaign related to certain bus and refuse applications to address shift quality at low-speed
2025FA09
June 30, 2025
Page 1 of 9
SUBJECT:
Special Coverage for Neutral at Stop: Coasting Feature Update — Reactive
MODELS
AFFECTED:
3000 Series™ and 4000 Series™ (B and T models, as well as 3200 Series™ non-Bus
models)
VOCATIONS AFFECTED:
Bus and Refuse Applications
Introduction
Allison has identified a potential concern with shift quality for low-speed Neutral at Stop Coast to 1 (First Range)
shifts, related to the 6th Generation Controls feature Neutral at Stop: Coasting. As a Global Customer Satisfaction
initiative, Allison will support the reactive repair of 6th Generation B and T model units (and 3000-4000 Series
units in Iveco Eurocargo vehicles) with Neutral at Stop Coasting mode enabled and the symptoms described
below for five years from the in-service date of the vehicle. This Field Action does not cover transmission service
work unrelated to the symptoms described within.
NOTE: The purpose of this Field Action is to provide a reactive repair (after the concern has been
observed) of the covered condition. Refer to the following instructions to identify affected transmissions,
obtain authorization to perform the repair and submit the proper warranty claim.
The following symptoms may be present with the suspect condition:
•
•
•
•
Harsh shift quality for low-speed Neutral at Stop Coast to 1 (First Range) shifts
DTC P0722 — Output Shaft Speed Sensor Circuit – No Signal
DTC P0731 — Incorrect First Gear Ratio
DTC P27B6 — Internal Control Module Transmission Speed Sensor Performance
Before updating the Transmission Control Module (TCM) software, you must confirm that the TCM software level
is at C242 or prior. Additionally, verify the Neutral at Stop: Coasting feature is enabled. To check these items,
follow the steps outlined below.
NOTE: Screenshots confirming applicable software level and Neutral at Stop: Coasting must be
submitted with the warranty claim in 4WARD.
Confirming TCM Software
Confirm that the current TCM software level is C242 or prior. If the TCM software level is C243 or later, the unit
is not eligible under this Field Action. The software level can be found by connecting the TCM with Allison DOC®
JE / FA9357EN
xi51761
Copyright © 2025 Allison Transmission, Inc. All Rights Reserved.
2025FA09
June 30, 2025
Page 2 of 9
and going to the TCM Information screen (refer to Figure 1 for new Allison DOC and Figure 2 for old Allison
DOC). The first four digits of the Calibration (CAL) ID indicate the current software level. If the software level is
C242 or prior and the vehicle is exhibiting the symptoms described above, the software level should be updated
to C243 or later.
7000806
Figure 1. Current Software Level Example in New Allison DOC
Copyright © 2025 Allison Transmission, Inc. All Rights Reserved.
2025FA09
June 30, 2025
Page 3 of 9
7000807
Figure 2. Current Software Level Example in Old Allison DOC
Confirming Neutral at Stop Low-Speed Coasting Feature
Confirm that the Neutral at Stop: Coasting feature is enabled in the transmission calibration. If the Neutral at
Stop low-speed coasting feature is not enabled, the unit is not eligible under this Field Action. The calibration
setting can be found by connecting the TCM with Allison DOC and going to the "ECU Reprogramming" tab (refer
to Figure 3), “Calibration Information” tab (refer to Figure 4) or "Customer Modifiable Constant" screen (refer to
Figure 5).
Copyright © 2025 Allison Transmission, Inc. All Rights Reserved.
2025FA09
June 30, 2025
Page 4 of 9
7000808
Figure 3. Confirming Neutral at Stop: Coasting in New Allison DOC (ECU Reprogramming)
Copyright © 2025 Allison Transmission, Inc. All Rights Reserved.
2025FA09
June 30, 2025
Page 5 of 9
7000809
Figure 4. Confirming Neutral at Stop: Coasting in New Allison DOC (Calibration Information)
Copyright © 2025 Allison Transmission, Inc. All Rights Reserved.
2025FA09
June 30, 2025
Page 6 of 9
7000810
Figure 5. Confirming Neutral at Stop: Coasting in Old Allison DOC
Service Action
If the above conditions are met, update the software to C243 or later by programming based on the TCM serial
number in new Allison DOC or in TCM Reflash™. To receive the latest software level, it is necessary to check the
box labeled “Download Latest Calibration”.
NOTE: The “Download Latest Calibration” option should only be used when there is a specific need to
update the software.
Copyright © 2025 Allison Transmission, Inc. All Rights Reserved.
2025FA09
June 30, 2025
Page 7 of 9
7000811
Figure 6. Updating to Latest Software Level in New Allison DOC
7000812
Figure 7. Updating to Latest Software Level in TCM Reflash
Copyright © 2025 Allison Transmission, Inc. All Rights Reserved.
2025FA09
June 30, 2025
Page 8 of 9
After programming is complete, use Allison DOC to verify that the second through fourth digits of the CAL ID are
243 or greater.
7000813
Figure 8. Updated Software Level Example in New Allison DOC
7000814
Figure 9. Updated Software Level Example in Old Allison DOC
Copyright © 2025 Allison Transmission, Inc. All Rights Reserved.
2025FA09
June 30, 2025
Page 9 of 9
Warranty Information
Allison service outlets shall submit a 4WARD claim for each transmission serial number completed under the
Field Action. In each Field Action 4WARD claim, any labor or travel cost beyond the scope of the Field Action
letter (1 hour of labor and travel cost) but necessitated by the Field Action must be explained and justified in the
claim narrative, otherwise they will be deducted from the claim.
Work unrelated to the scope of the Field Action must have a separate dedicated 4WARD claim submitted.
Allison service outlets must follow the published Allison current labor time guide for work performed when adding
any additional charges.
Claim Submittal Information
Approved authorized Allison service outlets must submit work performed per this Field Action as outlined in Table
1. This Global Customer Satisfaction Field Action initiative remains active until five years from the in-service date
of the vehicle. Submit all 2025FA09 claims as Claim Type Campaign.
Include an attached Allison DOC screen capture of the “DTC and General Information” page showing the TCM
serial number and CAL ID fields prior to updating the calibration as shown in Figure 1 and an attached Allison
DOC screen capture of the “Calibration Information” page showing the Neutral at Stop: Coasting field prior to
updating the calibration as shown in Figure 3, Figure 4 and Figure 5.
Table 1 Claim Information
Claim Type
Campaign
Special Activity Indicator
2025FA09
Primary Failed Part
400
Complaint Code
AT02
Failure Code
CC03
Allison service outlets must follow the published Allison current labor time guide for work performed when adding
any additional charges.
Contact Information
For questions concerning this Global Customer Satisfaction initiative, please contact:
Allison Transmission, Inc.
Attn: 3000/4000 Service Group
P.O. Box 894
Indianapolis, IN 46206-0894
1-800-252-5283
FAX: 317-242-2712
Allison[email protected]
Copyright © 2025 Allison Transmission, Inc. All Rights Reserved.
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TSB/Document ID: 2025FA09
Replacement Service Bulletin Number:
MFR Communication Date: 2025-07-01
MFR Internal Campaign ID/Software Version:
Communication Type: Other
NHTSA Components: POWER TRAIN
MFR Component System: Transmission
MFR Component Subsystem:
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