14TR21Rev A Service Bulletin/Repair Instructions

Revisions to this document are noted

by a stripe in the left-hand margin
SUBJECT:
SIL 14-TR-21, Rev. A

September 16, 2021

Page 1 of 7
Allison Transmission 6th Generation Controls Release
MODELS AFFECTED:
1000, 2000, 3000, and 4000 Series (Including B and T Models)
Introduction:

Allison Transmission, Inc. (ATI) has released Allison 6th Generation Controls as of October 15, 2021. The

purpose of this release is to add support of functional safety (ISO 26262) compliance, improve cybersecurity, and

add CAN-FD capability.

This SIL is organized into the following sections that describe the enhancements included in 6th

Generation Controls:

I. New Components:

• Transmission Control Module (TCM) Variants

• Servicing 6th Generation TCMs

• Shift Selectors

• Hall Effect Speed Sensors

II. New or Modified DTCs:

• 1000 and 2000 Series

• 3000 and 4000 Series

III. Cybersecurity Requirements:

• Offline Authentication USB Dongle
Section I – New Components:

TCM Variants:

New TCMs are used with 6th Generation Controls. The 6th Generation TCMs look similar and have the same

mounting footprint and same electrical connector as the 5th Generation TCMs. The 6th Generation TCM is 10mm

longer and can be visually differentiated from the 5th Generation TCM by looking for the raised rectangular

section between the cooling fins as shown in Figure 1.
DH / SL8881EN
5706217
Copyright © 2021 Allison Transmission, Inc. All Rights Reserved.
SIL 14-TR-21, Rev. A

September 16, 2021

Page 2 of 7
Figure 1. 6th Generation and 5th Generation TCMs

Table 1 shows the new TCM variants and a description of each.

Table 1. 6th Generation TCM Model

6th

Generation

TCM Model
Type
Part Number (Blank)
5th Generation Equivalent
C71M
12 volt, all 6-speed
29562546
29556882 (A61)
C72M
12 volt, all 6-speed and 7-speed, retarder
29562547
29556883 (A62)
C73M
12 volt and 24 volt, all transmissions and

features
29562548
29556884 (A63)
Servicing 6th Generation TCMs

5th Generation and 6th Generation TCMs are not compatible. As a result, 5th Generation TCMs will still be

serviced by A63 and A6C TCMs. Similar to 5th Generation, only the 12/24 volt C73M will be available as a service

replacement. Table 2 shows a table of the service TCM part numbers for 4th Generation, 5th Generation, and

6th Generation Controls.

Table 2. 4th Generation, 5th Generation, and 6th Generation Service TCMs

TCM Model
Description
Part Number (Blank)
TCMs Serviced
C73M
6th Generation Service TCM
29562548
C71M, C72M, C73M
A63
5th Generation Service TCM
29556884
A61, A62, A63
A6C
5th Generation Service TCM
29558100
A6A, A6B, A6C
A59
4th Generation Service TCM
29551869
A41, A42, A43, A51, A52,

A53, A59
Copyright © 2021 Allison Transmission, Inc. All Rights Reserved.
SIL 14-TR-21, Rev. A

September 16, 2021

Page 3 of 7

Shift Selectors:

6th Generation push button shift selectors (PBSS) are offered in Standard, Common, and Compact. The 6th

Generation PBSS have the same mounting footprint and electrical connector as their 5th Generation counterparts.

The 6th Generation PBSS cannot be visually differentiated from 5th Generation unless looking at the part label.

The 6th Generation label shows a prominent “G6” on the right-hand side of the label, as is shown in Figure 2.

Additionally, when installed and powered, all 6th Generation models have a software feature that when pushing the

up and down arrows, the last menu (after oil level display, DTCs, etc.) will display the selector type as “6th Gen”, as

is shown in Figure 4. 6th Generation push button shift selectors are not backward compatible with 5th Generation

TCMs. 5th Generation bump-lever and strip (3-button and 6-button) selectors are forward compatible with 6th

Generation TCMs. The installed shift selector must match the selector specified in the TCM calibration.
Figure 2. 6th Generation PBSS Label
Figure 3. 5th Generation PBSS Label
Figure 4. 6th Generation PBSS Display showing “6th Gen” Text
Copyright © 2021 Allison Transmission, Inc. All Rights Reserved.
SIL 14-TR-21, Rev. A

September 16, 2021

Page 4 of 7

Table 3. Service Shift Selectors

6th Generation Shift

Selector Model
Push Button (PBSS)
Type
Part Number
Compact
29563388
Compact, Alternate Mount
29563389
Common
29563384

29563383 w/ kit
Standard
29563387

29563386 w/ kit
Hall Effect Speed Sensors:

6th Generation Controls require the use of a new Hall Effect (HE) Output Speed Sensor, which is needed to meet

Functional Safety Requirements. Engine and Turbine Speed Sensors remain of the Variable Reluctance (VR)

type and are unchanged from 5th Generation Controls. The HE Sensor uses the same access bore as the VR

Sensor, but the clamp configuration and connector are different to prevent installation of an incorrect sensor. The

HE sensor orientation with respect to the target (tone wheel) and the wire polarity are both critical, unlike with

the 5th Generation VR sensors.

The HE Output Speed Sensor is not backward compatible with 5th Generation Controls. The VR Output Speed

Sensor is not forward compatible with 6th Generation Controls.

Table 4. Output Speed Sensor Part Numbers

Transmission Model
Rear Cover Part Numbers
VR Speed Sensor Part

Numbers
HE Speed Sensor

Part Numbers
3000 SeriesTM

Non-Retarder
29540393, 29541001, 29546599
29544139
29566163
3000 SeriesTM Retarder
29546672
29543434
29566225
TM
Universal
29540394, 29506122
29543432
29566221
TM
Retarder
29551547, 29551653
29544139
29566223
4000 SeriesTM
29540134, 29542565, 29540139,

29548961
29544139
29566224
4000 SeriesTM w/

Dropbox Provision
29542550
29543432
29566222
1000 and 2000 Series
29537009, 29551580, 29559870
29536408
29562542
3000 Series
4000 Series
Copyright © 2021 Allison Transmission, Inc. All Rights Reserved.
SIL 14-TR-21, Rev. A

September 16, 2021

Page 5 of 7
Section II – New or Modified DTCs:

6th Generation Controls include new DTCs and modifications to existing DTCs. The following tables show the

affected DTCs.

1000 and 2000 Series

Table 5. 1000 and 2000 Series Modified and Added DTCs

Description
DTC

P0600
Solenoid Controller Serial Peripheral Interface Communication Bus Off
P0604
Control Module Random Access Memory (RAM)
P060C
Internal Control Module Main Processor Performance
P0652
Sensor Reference Voltage B Circuit Fault
P0720
Output Shaft Speed Sensor Circuit
P0721
Output Shaft Speed Sensor Circuit - Performance
P0722
Output Shaft Speed Sensor Circuit - No Signal
P0965
Pressure Control Solenoid (PCS) 2 System Performance
P0969
Pressure Control Solenoid (PCS) 3 System Performance
P2728
Pressure Control Solenoid (PCS) 1 System Performance
P2762
Torque Converter Clutch (TCC) Pressure Control Solenoid (PCS) Control Circuit Range/Performance
P27B2
Internal Control Module Transmission Range Control Performance
P27B4
Internal Control Module Transmission Gear Direction Control Performance
P27B6
Internal Control Module Transmission Speed Sensor Performance
U0103
Lost Communication with Gear Shift Module 1
U0304
Gear Shift Module 1 Incompatible
U0404
Gear Shift Module 1 Invalid Data
U1401
J1939 TSC1 Engine Message Impostor Detected
U1402
J1939 TSC1 Compression Brake Message Impostor Detected
U1403
J1939 TSC1 Exhaust Brake Message Impostor Detected
Copyright © 2021 Allison Transmission, Inc. All Rights Reserved.
SIL 14-TR-21, Rev. A

September 16, 2021

Page 6 of 7

3000 and 4000 Series

Table 6. 3000 and 4000 Series Modified and Added DTCs

Description
DTC

P0600
Solenoid Controller Serial Peripheral Interface Communication Bus Off
P0604
Control Module Random Access Memory (RAM)
P060C
Internal Control Module Main Processor Performance
P0652
Sensor Reference Voltage B Circuit Fault
P0720
Output Shaft Speed Sensor Circuit
P0721
Output Shaft Speed Sensor Circuit - Performance
P0722
Output Shaft Speed Sensor Circuit - No Signal
P085D
Gear Shift Module 1 Performance
P085E
Gear Shift Module 2 Performance
P0965
Pressure Control Solenoid (PCS) 2 System Performance
P0969
Pressure Control Solenoid (PCS) 3 System Performance
P2719
Pressure Control Solenoid (PCS) 4 System Performance
P2728
Pressure Control Solenoid (PCS) 1 System Performance
P2762
Torque Converter Clutch (TCC) Pressure Control Solenoid (PCS) Control Circuit Range/Performance
P27B2
Internal Control Module Transmission Range Control Performance
P27B4
Internal Control Module Transmission Gear Direction Control Performance
P27B6
Internal Control Module Transmission Speed Sensor Performance
P2813
Pressure Control Solenoid (PCS) 6 System Performance
U0103
Lost Communication with Gear Shift Module 1
U0291
Lost Communication with Gear Shift Module 2
U0304
Gear Shift Module 1 Incompatible
U0333
Gear Shift Module 2 Incompatible
U0404
Gear Shift Module 1 Invalid Data
U0592
Gear Shift Module 2 Invalid Data
U1401
J1939 TSC1 Engine Message Imposter Detected
U1402
J1939 TSC1 Compression Brake Message Imposter Detected
U1403
J1939 TSC1 Exhaust Brake Message Imposter Detected
Copyright © 2021 Allison Transmission, Inc. All Rights Reserved.
SIL 14-TR-21, Rev. A

September 16, 2021

Page 7 of 7
Section III – Cybersecurity Requirements:

6th Generation Controls provide improved cyber security to:

• Prevent unauthorized software from operating on Allison hardware

• Prevent unauthorized tools from programming Allison hardware

• Prevent unauthorized on-vehicle messaging from impacting vehicle operation

• Protect Allison intellectual property

Offline Authentication USB Dongle

Allison’s 6th Generation TCMs require TCM Reflash and Allison DOC® software to “authenticate” with the TCM in

order to perform reflashing events, reprogramming, and certain action requests. Authentication can be achieved in

two ways: 1) online with an active internet connection to Allison Product Cybersecurity System (PCS) or 2) offline

with a USB dongle. The offline authentication USB dongle requires Allison HUBTM user ID or Allison TCM Reflash

user ID to activate and is good for set number of signing tokens (signs). During reflashing, reprogramming, and

performing action requests, the sign count is decremented. Once the signs are depleted or near depletion, the USB

dongle must be refreshed/recharged using a computer that has an active internet connection.

USB dongles are considered an essential tool and can be purchased from Noregon Systems’ Allison Web Store

(https://allisonstore.noregon.com/collections/cybersecurity-e-tools).

More information relating to the USB dongle will be included in future Allison DOC® and TCM Reflash SILs.
Copyright © 2021 Allison Transmission, Inc. All Rights Reserved.

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