SIL 09-TR-24 Other

SIL 09-TR-24

May 23, 2024

Page 1 of 8

SUBJECT:
Updates for Neutral at Stop Low-Speed Coasting Feature
MODELS AFFECTED:
1000 SeriesTM, 2000 SeriesTM, 3000 SeriesTM, 4000 SeriesTM
Introduction:

On May 7, 2024, Allison released BCN 243 software which addresses the item below. If the vehicle is exhibiting

any of the complaints or issues mentioned below, please follow the outlined service procedure.
Description of Complaint:

BCN 243 PC addresses a shift quality complaint at low speeds related to the 6th Generation Controls feature

Neutral at Stop with low-speed coasting. Some of the shift quality complaints are accompanied with a P0722,

P0731 or P27B6 Diagnostic Trouble Code (DTC). Please contact your local Allison Dealer or Distributor for

additional information.

• P0722 – Output Shaft Speed Sensor Circuit – No Signal

• P0731 – Incorrect 1st Gear Ratio

• P27B6 – Internal Control Module Transmission Speed Sensor Performance

If the vehicle exhibits these low-speed abrupt shifts or any of these DTCs are trigged along with low-speed abrupt

shifts and the vehicle is equipped with the Neutral at Stop low-speed coasting feature, it is advised to update the

transmission software to BCN 243 or above. If you are unable to update the transmission software, then it is

recommended to disable the Neutral at Stop low-speed coasting feature.

To verify the software level and whether the vehicle is equipped with the Neutral at Stop low-speed coasting

feature, follow these steps in Allison DOC®. You may also be able to view a vehicle summary report in ACCT or

TCM ReflashTM as well.
Updating TCM Software:

Confirming TCM Software:

Before updating the TCM software, you must confirm that the TCM software level is at B242, C242, N242 or prior.

Additionally, verify Neutral at Stop low-speed coasting feature is enabled. To check these items, please follow

the steps outlined below.

• Confirm that the current TCM software level is at B242, C242, N242 or prior. If the TCM software level is

B243, C243, N243 or above, the information in this Service Information Letter is not applicable to your
KB / SL9189EN
6740357
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.
SIL 09-TR-24

May 23, 2024

Page 2 of 8

vehicle. The software level can be found by connecting the TCM with Allison DOC. The DTC and General

Info will show in the TCM Information section. The first four digits of the Cal ID indicate the current software

level. If the software level is B242, C242, N242 or prior and the vehicle is exhibiting the symptoms described

above, the software level should be updated to either B243, C243, N243 or above.
Figure 1. Current Software Level Example in Allison DOC

Confirming Neutral at Stop Low-Speed Coasting Feature:

• Confirm that the Neutral at Stop low-speed coasting feature is enabled in the transmission calibration. If the

Neutral at Stop low-speed coasting feature is not active, then the information in this Service Information

Letter is not applicable to your vehicle. The calibration setting can be found by connecting the TCM with
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.
SIL 09-TR-24

May 23, 2024

Page 3 of 8

Allison DOC. The Neutral at Stop low-speed coasting feature can either be enabled or disabled in the

reprogramming menu under the FuelSense® section, as shown below in Figure 2.
Figure 2. Confirming Neutral at Stop Coasting

Updating TCM Software:

• If the current software is older than B243, C243 or N243, update software to B243, C243 or N243 or above

by programming based on the TCM serial number in TCM Reflash. To receive the latest software level, it is

necessary to check the box labeled “Download Latest Calibration” on the Add screen in TCM Reflash (refer

to Figure 3). After programming is complete, use Allison DOC to verify that the second through fourth digits

of the Cal ID are 243 or above (refer to Figure 4).
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.
SIL 09-TR-24

May 23, 2024

Page 4 of 8
Figure 3. Updating to Latest Software Level in TCM Reflash

NOTE: The “Download Latest Calibration” option in TCM Reflash should only be used when there is a

specific need to update the software.
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.
SIL 09-TR-24

May 23, 2024

Page 5 of 8
Figure 4. Updated Software Level Example in Allison DOC
Disabling Neutral at Stop Low-Speed Coasting

Confirming Neutral at Stop Low-Speed Coasting Feature:

Before disabling the Neutral at Stop low-speed coasting feature, confirm that the feature is enabled. To check,

please follow the steps outlined below.

• Confirm that the Neutral at Stop low-speed coasting feature is enabled in the vehicle’s calibration. If the

Neutral at Stop low-speed coasting feature is not active, then the information in this Service Information

Letter is not applicable to your vehicle. The calibration setting can be found by connecting the TCM with

Allison DOC. The Neutral at Stop low-speed coasting feature can either be enabled or disabled in the

reprogramming menu under the FuelSense section, as shown below in Figure 5.
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.
SIL 09-TR-24

May 23, 2024

Page 6 of 8
Figure 5. Confirming Neutral at Stop Coasting Enabled

Disabling Neutral at Stop Low-Speed Coasting Feature:

• To disable the feature without updating vehicle software level, click the arrow drop down by Enabled,

and select Disabled. Then select the button marked Reprogram TCM. This will reprogram the TCM and

disable the feature. To verify, open the reprogramming menu and check the calibration setting status as

shown in Figure 6.

NOTE: If the vehicle must be serviced later and the TCM is reprogrammed with the original TCM Assembly

Number, the feature will be re-enabled. Reprogramming with the TCM Serial Number will not re-enable

the feature. To permanently disable the feature, please contact Allison for a new calibration.
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.
SIL 09-TR-24

May 23, 2024

Page 7 of 8
Figure 6. Neutral at Stop Coasting Disabled
Claim Submittal Information:

Warranty:

The actions described in this document will be covered by the standard warranty, supplemental or ETC coverage,

whichever is relevant on your Repair Order Open Date. If the transmission no longer has an active coverage,

this action will not be covered by warranty.

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.
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.
SIL 09-TR-24

May 23, 2024

Page 8 of 8

Table 1. Claim Information

CLAIM TYPE
Machine
PRIMARY FAILED PART
400
PRIMARY FAILED PART SERIAL NUMBER
TCM Serial Number shown in Allison DOC Snapshot
Include reference to this SIL in the 4WARDTM Work Performed Comments field with your normal complaint, cause

and correction narrative as per example shown below:
Table 2. Labor Codes/Hours

LABOR OPERATION CODE
LABOR HOURS
LABOR OPERATIONS
00096501
1.0
RECALIBRATE TCM
00096400
0.5
TEST DRIVE
Any additional parts, labor or net items required to complete this action must be justified in the Work Performed

Comments field of the claim.
Copyright © 2024 Allison Transmission, Inc. All Rights Reserved.

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