NHTSA ID Number: 10218844
Manufacturer Communication Number: TT8484
TSB/Document Date: 2022-08-29
Summary
Diagnostic Trouble Code P0658 Actuator Supply Circuit Low ? HSD1.
Revisions to this document are noted
by a stripe in the left-hand margin
SUBJECT:
TT8484EN, Rev. A
July 08, 2022
Page 1 of 4
Diagnostic Trouble Code P0658 Actuator Supply Circuit Low – HSD1
MODELS AFFECTED:
1000, 2000, 3000 and 4000 Series Transmissions with 5th Generation and 6th Generation
Controls
Description of Complaint:
Diagnostic Trouble Code DTC P0658 Actuator Supply Circuit Low – HSD1 remains active after completing all
troubleshooting steps.
Cause:
A short to ground condition in wire 176 may cause a low resistance in the High Side Driver 1 (HSD1) solenoid
circuit, causing DTC P0658 to set. Allison 4th Generation Controls used Trans ID (TID) wire 176 to communicate
the TID to the TCM. During the transition from Allison 4th Generation Controls to 5th Generation Controls, TID was
no longer communicated by wire 176. With this change, wire 176 was no longer required, but some OEMs may
have retained the wire in the chassis harness. The 5th and 6th Generation Allison Transmission troubleshooting
manuals removed the step of verifying a short to ground on wire 176 as a part of the troubleshooting process. As
such, wire 176 was no longer used to detect TID information. The following information identifies each transmission
series and service procedure to follow, should this DTC present itself after following the Allison Transmission
troubleshooting manual procedure for DTC P0658.
1000/2000 Series Transmissions with 4th Generation, 5th Generation and 6th Generation
Controls:
Wire 176 is contained within the OEM chassis wiring harness and communicates the TID signal from the
transmission 24-way connector, pin 24, to the TCM 80-way connector, pin 76.
Allison 4th Generation Controls (Figure 1) uses wire 176 within the OEM chassis wiring harness to communicate
the TID signal from the transmission 24-way connector, pin 24, to the TCM 80-way connector, pin 76.
Allison 5th and 6th Generation Controls (Figure 2) no longer use wire 176 for TID. OEM installed wire 176
is indicated by “(Optional by OEM)” on the Allison Transmission wiring schematic. The connection in those
transmission internal wiring harnesses is in the same location as the 4th Generation transmission internal harness.
This harness contains the same wires as the 4th Generation transmission internal harness, including pin 24, even
though 5th and 6th Generation Controls do not use Trans ID to identify the transmission build configuration.
LRC / TT8484EN
6162906
Copyright © 2022 Allison Transmission, Inc. All Rights Reserved.
TT8484EN, Rev. A
July 08, 2022
Page 2 of 4
20-WAY CONNECTOR
24-WAY CONNECTOR
TRANSMISSION
TRANSID
HSD1
PCS1
MAIN MOD
TCC
PCS2
SS1
SS2
24
L
M
15
S
19
J
N
10
16
P
17
A
1
B
SS3
14
C
2
3
176
76
111
11
155
55
174
178
HSD1
ANALOG
INTERFACE
74
L
78
171
71
136
HSD2
V BATT
36
152
52
133
33
151
L
51
6164837
Figure 1. 4th Generation Wiring Schematic
24-WAY CONNECTOR
TRANSMISSION
TRANSID
HSD1
PCS1
MAIN MOD
TCC
PCS2
24
14
15
19
10
16
17
SS1
SS2
SS3
1
2
3
PCS3
TCM
(Optional by OEM)
13
12
176
111
155
174
178
171
136
152
133
151
131
137
76
11
HSD1
55
74
L
78
71
HSD2
V BATT
36
52
33
L
51
31
HSD3
37
L
6164947
Figure 2. 5th Generation and 6th Generation Wiring Schematic
Service Procedure for 1000 and 2000 Series Transmissions:
Remove pin 24 from the transmission 24-way connector and pin 76 from the TCM 80-way connector. Install
cavity plugs in each of the open connector cavities once the pins are removed. Use cavity plug, part number
12034413 (St. Clair P/N 300008). Eliminating wire 176 removes any potential for an unwanted short to ground
causing DTC P0658.
Copyright © 2022 Allison Transmission, Inc. All Rights Reserved.
TT8484EN, Rev. A
July 08, 2022
Page 3 of 4
NOTE: The Allison Transmission warranty, or the extended coverage for parts and labor, does not cover
the repair or replacement of OEM or bodybuilder-provided components or any external wire harnesses not
provided by Allison Transmission, Inc.
3000/4000 Series Transmissions with 4th Generation, 5th Generation and 6th Generation
Controls (TIDA and TIDB):
TIDA, 4th Generation Controls (Figure 3) uses wire 176 in the OEM chassis wiring harness to communicate the
TID signal from the transmission 20-way connector, pin 20, to the TCM 80-way connector, pin 76.
TID A and TIDB, 5th and 6th Generation Controls (Figure 4) no longer uses wire 176 for TID. Instead, it uses two
5KΩ resistors wired in series between the High Side Driver 1 (HSD1) and HSD2 circuits to communicate TID to the
TCM. OEM installed wire 176 is indicated by “(Optional by OEM)” on the Allison Transmission wiring schematic.
Regardless of how the TCM recognizes TID, the TIDB internal wiring harness has the same TRANS ID (TID) to
HSD1 connection (including pin 20) as the TIDA internal wiring harness. Therefore, the internal wiring harness
troubleshooting and repair procedure is the same regardless of TID type in Allison 5th Generation Controls.
TRANSMISSION
TRANSID
HSD1
PCS4
PCS6
MAIN MOD
TCM
20
1
2
7
8
176
111
155
178
174
ANALOG
INTERFACE
76
11
HSD1
V BATT
55
78
74
6165867
Figure 3. TIDA 4th Generation Wiring Schematic
Copyright © 2022 Allison Transmission, Inc. All Rights Reserved.
TT8484EN, Rev. A
July 08, 2022
Page 4 of 4
TRANSMISSION
TIDA
TRANSID
HSD1
PCS4
TCM
(Optional by OEM)
20
1
2
PCS6
MAIN MOD
HSD2
PCS1
7
8
6
4
PCS2
PCS3
SS1
5
9
10
NOMINAL 5K Ω
HSD1
PCS4
MAIN MOD
HSD2
PCS1
PCS3
SS1
20
1
7
8
6
4
PCS2
155
174
178
171
136
152
133
151
76
11
HSD1
V BATT
55
74
78
71
HSD2
V BATT
36
52
33
51
(Optional by OEM)
2
PCS6
111
TRANSMISSION
TIDB
TRANSID
176
5
9
10
176
111
155
174
178
171
136
152
133
151
76
11
HSD1
V BATT
55
74
78
71
HSD2
V BATT
36
52
33
51
6166187
Figure 4. TIDA/TIDB 5th Generation and TIDB only 6th Generation Wiring Schematic
Service Procedure for 3000 and 4000 Series Transmissions:
Remove pin 20 from the transmission 20-way connector and pin 76 from the TCM 80-way connector. Install cavity
plugs in each of the open connector cavities once the pins are removed. Use cavity plug, P/N 12034413 (St. Clair
P/N 300008). Eliminating wire 176 removes any potential for an unwanted short to ground causing DTC P0658.
NOTE: The Allison Transmission warranty, or the extended coverage for parts and labor, does not cover
the repair or replacement of OEM or bodybuilder-provided components or any external wire harnesses not
provided by Allison Transmission, Inc.
Copyright © 2022 Allison Transmission, Inc. All Rights Reserved.
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TSB/Document ID: TT8484
Replacement Service Bulletin Number:
MFR Communication Date: 2022-07-08
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
MFR Component System:
MFR Component Subsystem:
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