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September, 2018
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SUBJECT:

Allison Transmission 5th Generation Controls 2018 BC 181 – New/Updated Diagnostic Trouble
Codes (DTCs)

MODELS AFFECTED:

1000, 2000, 3000 and 4000 Series Product Families (Including B and T Models)

Introduction:
Allison Transmission, Inc. released 5th Generation Controls 2018 BC 181 software on, April 19, 2018. For
1000/2000 Series Product Families, this release includes two new Diagnostic Trouble Codes (DTCs), two updated
DTCs, and seven DTCs intended for the General Motors Silverado 4500HD, 5500HD and 6500HD models, as well
as the NAVISTAR CV model. For 3000/4000 Series Product Families, this release includes four updated DTCs.

1000/2000 DTCs (refer to Appendix A)
The two new DTCs:
• P0600 Internal Serial Peripheral Interface (SPI) Diagnostics
• P07CE Neutral At Stop (NAS) Not Functioning
The two updated DTCs:
• P071A Neutral At Stop (NAS) Input Failed On
• P0703 Brake Switch Circuit
The seven DTCs intended for the General Motors Silverado 4500HD, 5500HD and 6500HD models, as well as
the NAVISTAR CV model:
• P060C Main Processor Monitor (MPM)
• P0600 Internal Serial Peripheral Interface (SPI) Diagnostics
• P0965 Pressure Control Solenoid 2 (PCS2) Control Circuit – Performance
• P2534 Ignition Switch Run/Start – Circuit Low
• P2535 Ignition Switch Run/Start – Circuit High
• P2728 Pressure Control Solenoid 1 (PCS1) Control Circuit – Performance
• P2762 Torque Converter Clutch (TCC) Pressure Control Solenoid (PCS) Control Circuit - Performance

WBD / SL8163EN

4188524

Copyright © 2018 Allison Transmission, Inc. All Rights Reserved.

SIL 14-TR-18
September, 2018
Page 2 of 72

3000/4000 DTCs (refer to Appendix B)
The four updated DTCs:
• P0600 Internal Serial Peripheral Interface (SPI) Diagnostics
• P07CE Neutral At Stop (NAS) Not Functioning
• P071A Neutral At Stop (NAS) Input Failed On
• P0703 Brake Switch Circuit

Additional Information:
For additional information regarding the Allison Transmission 5th Generation Controls 2018 BC 181 software
updates outlined in this document, refer to Allison 5th Generation Controls publications available on the Allison
Hub under the Tech Data link or contact your Allison representative.

Copyright © 2018 Allison Transmission, Inc. All Rights Reserved.

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September, 2018
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Appendix A. 1K2K Troubleshooting

Copyright © 2018 Allison Transmission, Inc. All Rights Reserved.

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September, 2018
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DTC P060C Main Processor Monitor (MPM) Monitor
Circuit Description
This DTC detects when the main processor microprocessor faults as well as the ability for the main processor
monitor (MPM) to take action.
Action Taken When the DTC Sets
When DTC P060C is active, the following conditions occur:
• The MALFUNCTION INDICATOR LAMP illuminates on first occurrence.
• The Service Transmission message is displayed in the vehicle message center on the Silverado 4500HD,
5500HD, 6500 HD and the Navistar CV models.
• The DTC is stored in the TCM history.
• Transmission operates in hydraulic default: R (Reverse), N (Neutral), and 3 (Third Range).
NOTE: When connecting the Allison DOC® software to a General Motors Silverado 4500HD, 5500HD
and 6500HD models or a NAVISTAR CV model use the J-48624 NEXIQTM USB-LinkTM (Superceded by
124032) Translator and the J-41788 OBD II Connector.
Conditions for Clearing the DTC
Replace the TCM.
NOTE: The J-39700 Universal Breakout Box, adapter harnesses, jumpers, and the J-46708
Digital Multimeter leads add a few ohms of resistance to a circuit. Refer to BEGINNING THE
TROUBLESHOOTING PROCESS for the procedure to determine the tool resistance that is added to a
test circuit.

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.
Before repairing or replacing these components or circuits that caused a transmission issue, always
contact the vehicle OEM call center and/or the vehicle OEM or bodybuilder service representative to
verify the warranty coverage and proper payment arrangements, arrange an alternate sublet or repair
plan (if needed), and get troubleshooting assistance for the repair (such as vehicle schematics, DTC
trees, parts assistance, etc.).

Copyright © 2018 Allison Transmission, Inc. All Rights Reserved.

SIL 14-TR-18
September, 2018
Page 5 of 72

DTC P060C Main Processor Monitor (MPM) Monitor (cont'd)
Step

Action

1

Yes

No

Connect the Allison DOC® software using
J-48624 Translator and J-41788 OBD II
Connector.
2. Start engine.
3. Using the Allison DOC® software, record
snapshot showing active or inactive DTC(s).
4. Review failure records report from snapshot
to determine conditions when DTC occurs.
Is DTC active?

Go to Step 3

Troubleshoot
any other active
DTCs if present.
If no other DTCs
are active, go
to Step 2

2

1.
2.
3.

Go to Step 3

System OK.
Clear inactive
DTCs and return
vehicle to service

Begin the
diagnosis again.
Go to Step 1

Repair complete.

1.

Clear the DTC.
Start the engine and test drive the vehicle.
Attempt to duplicate the same conditions
observed in the failure records (range
attained, temperature, etc.).

Value(s)

NOTE: This DTC is intended to detect an
internal TCM failure.
Did DTC P060C return?
3

1.
2.

Turn ignition OFF.
Install new TCM and tighten the bolt to 2.0
– 3.2 N·m (18-28 lb in).
3. Install or reconnect OEM components and
connectors.
4. Start engine.
5. Using the J-48624 Translator device with
the J-41788 OBD II Connector and the
Allison DOC® software, check for active
DTCs.
Is DTC P060C active with new TCM?

Copyright © 2018 Allison Transmission, Inc. All Rights Reserved.

SIL 14-TR-18
September, 2018
Page 6 of 72

DTC P0600 Internal Serial Peripheral Interface (SPI) Diagnostics
Circuit Description
This DTC is set when the TCM detects an internal communication fault between the microprocessor and the
solenoid control integrated circuits internal to the TCM.
Actions Taken When the DTC Sets
When DTC P0600 is active, the following conditions occur:
• The MALFUNCTION INDICATOR LAMP illuminates on first occurrence.
• The Service Transmission message is displayed in the vehicle message center on the Silverado 4500HD,
5500HD, 6500 HD and the Navistar CV models.
• The DTC is stored in the TCM history.
• Transmission operates in hydraulic default: R (Reverse), N (Neutral), and 3 (Third Range).
NOTE: When connecting the Allison DOC® software to a General Motors Silverado 4500HD, 5500HD
and 6500HD models or a NAVISTAR CV model use the J-48624 NEXIQTM USB-LinkTM (Superceded by
124032) Translator and the J-41788 OBD II Connector.
Conditions for Clearing the DTC
Replace TCM.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
1. This step tests for an active DTC.
2. Validate the DTC.
3. Replace the TCM.
NOTE: The J-39700 Universal Breakout Box, adapter harnesses, jumpers, and the J-46708
Digital Multimeter leads add a few ohms of resistance to a circuit. Refer to BEGINNING THE
TROUBLESHOOTING PROCESS for the procedure to determine the tool resistance that is added to a
test circuit.

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.
Before repairing or replacing these components or circuits that caused a transmission issue, always
contact the vehicle OEM call center and/or the vehicle OEM or bodybuilder service representative to
verify the warranty coverage and proper payment arrangements, arrange an alternate sublet or repair
plan (if needed), and get troubleshooting assistance for the repair (such as vehicle schematics, DTC
trees, parts assistance, etc.).

Copyright © 2018 Allison Transmission, Inc. All Rights Reserved.

SIL 14-TR-18
September, 2018
Page 7 of 72

DTC P0600 Internal Serial Peripheral Interface (SPI) Diagnostics (cont'd)
Step

Action

1

Yes

No

Connect the Allison DOC® software.
Start engine.
Using the Allison DOC® software, record
snapshot showing active or inactive DTC(s).
4. Review failure records report from snapshot
to determine conditions when DTC occurs.
Is DTC P0600 active?

Go to Step 2

Troubleshoot
any other active
DTCs if present.
If no other DTCs
are active, go
to Step 2

2

1.
2.
3.

Go to Step 5

System OK.
Clear inactive
DTCs and return
vehicle to service

Begin the
diagnosis again.
Go to Step 1

Repair complete.

1.
2.
3.

Clear the DTC.
Start the engine and test drive the vehicle.
Attempt to duplicate the same conditions
observed in the failure records (range
attained, temperature, etc.).

Value(s)

NOTE: This DTC is intended to detect an
internal TCM failure.
Did DTC P0600 return?
3

1.
2.

Turn ignition OFF.
Install new TCM and tighten the bolt to 2.0
– 3.2 N·m (18-28 lb in).
3. Install or reconnect OEM components and
connectors.
4. Start the engine.
5. Using the Allison DOC® software, check for
active DTCs.
Is DTC P0600 active with new TCM?

Copyright © 2018 Allison Transmission, Inc. All Rights Reserved.

SIL 14-TR-18
September, 2018
Page 8 of 72

DTC P07CE Neutral At Stop Not Functioning
Description:
This DTC is set when the Neutral At Stop (NAS) is not functioning. This test monitors the inputs that affect the NAS
functionality. This DTC is enabled when the Neutral At Stop: Emissions Credit Vehicle is enabled.
How to Determine “NEUTRAL At Stop: Emission Credit Vehicle” Calibration Setting in the TCM:
The setting for “Neutral At Stop: Emission Credit Vehicle” can be found using the Allison DOC® Premium
software version 2018.1 or later by choosing “Additional Calibration Information” on the Calibration Information
screen.

The setting for “Neutral At Stop: Emission Credit Vehicle” can also be found in the FuelSense® section
of Allison Calibration Configuration Tool (ACCT), which can be found in the Engineering section of the
http://hub.allisontransmission.com/. The ACCT Calibration Summary Report will display this new parameter and
calibration setting only if the answer is set to YES in the calibration.

Copyright © 2018 Allison Transmission, Inc. All Rights Reserved.

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September, 2018
Page 9 of 72

DTC P07CE Neutral At Stop Not Functioning (cont'd)

When viewing or editing service calibration requests in ACCT, a green leaf icon
will appear next to the “Neutral
At Stop: Emission Credit Vehicle” and “Neutral At Stop” parameters if the answer to “Neutral At Stop: Emission
Credit Vehicle” parameter is set to YES. In this case, these parameters can only be modified by Allison service
personnel upon receipt of OEM authorization.
Action Taken When the DTC Sets
When DTC P07CE is active, the following conditions occur:
• The CHECK TRANS indicator is illuminated.
• The DTC is stored in the TCM history.
• TCM inhibits Neutral at Stop operation.
Conditions for Clearing the DTC/CHECK TRANS Light
Use the Allison DOC® software to clear the DTC from TCM history. The TCM automatically clears the DTC from
TCM history if the vehicle completes 40 warm-up cycles without the DTC recurring.
Diagnostic Aids
Setting one or more of the following conditions will cause NAS not to function and DTC P07CE to set:
• The Service Brake Input has failed setting DTC(s)
• U0400 Invalid Communication Link Data Received
• P0703 Brake Switch Circuit
• Engine Speed
• P0725 Engine Speed Sensor Circuit
• P0726 Engine Speed Sensor Circuit - Performance
• P0727 Engine Speed Sensor Circuit - No Signal
• NAS input fails
• When NAS is configured as a wired input, will set a P071A in addition to the P07CE
• Transmission Sump Temperature
• P0711 Transmission Fluid Temperature Sensor Circuit – Performance
• P0712 Transmission Fluid Temperature Sensor Circuit – Low Input
Copyright © 2018 Allison Transmission, Inc. All Rights Reserved.

SIL 14-TR-18
September, 2018
Page 10 of 72

DTC P07CE Neutral At Stop Not Functioning (cont'd)
• P0713 Transmission Fluid Temperature Sensor Circuit – High Input
• Throttle Input failed when input is over the CAN bus
• Verify throttle signal is present on the Data Bus using the Data Bus Viewer found in the Allison DOC®
software
• Throttle Input failed when input is an analog signal or a Pulse Width Modulation (PWM) signal
• P0122 Pedal Position Sensor Circuit – Low Voltage
• P0123 Pedal Position Sensor Circuit – High Voltage
• P1891 Throttle Position Sensor (TPS) PWM Signal – Low Input
• P1892 Throttle Position Sensor (TPS) PWM Signal – High Input
Tool Requirements:
• Allison DOC® software
Test Description
Each item number description in this list correlates to the identical number shown in the DTC table "Step" column
and is meant to briefly describe the "Action" column procedures for a particular step in the table. The DTC
troubleshooting step descriptions examine the following:
1. Check for active DTC.
4. Recalibrate a TCM with updated version of original calibration.
5. Install test a TCM.
NOTE: The J-39700 Universal Breakout Box, adapter harnesses, jumpers, and the J-46708
Digital Multimeter leads add a few ohms of resistance to a circuit. Refer to BEGINNING THE
TROUBLESHOOTING PROCESS for the procedure to determine the tool resistance that is added to a
test circuit.

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.
Before repairing or replacing these components or circuits that caused a transmission issue, always
contact the vehicle OEM call center and/or the vehicle OEM or bodybuilder service representative to
verify the warranty coverage and proper payment arrangements, arrange an alternate sublet or repair
plan (if needed), and get troubleshooting assistance for the repair (such as vehicle schematics, DTC
trees, parts assistance, etc.).

Copyright © 2018 Allison Transmission, Inc. All Rights Reserved.

SIL 14-TR-18
September, 2018
Page 11 of 72

DTC P07CE Neutral At Stop Not Functioning (cont'd)
Step

Action
Connect the Allison DOC® software.
Start engine.
Record a snapshot using the Allison DOC®
software showing active or inactive code(s).
4. Review failure records report from snapshot
to determine conditions when DTC occurs.
Is DTC P07CE active?

1

1.
2.
3.

2

1.
2.

Clear the DTC.
Start the engine and test drive the vehicle.

Value(s)

Yes

No

Troubleshoot
any other active
DTCs, if present.
If no other DTCs
are active, go
to Step 6

Go to Step 2

Go to Step 5

System OK.
Clear inactive
DTCs and
return vehicle
to service.

NOTE: This DTC is intended to detect NAS not
functioning due to a failed input.
3.

Attempt to duplicate the same conditions
observed in the failure records (range
attained, temperature, etc.).
Did DTC P07CE return?

3

NOTE: In most cases the TCM is not at fault.
Investigate thoroughly before replacing the
TCM. Refer to 4-6. TCM Diagnostic Procedure.

Go to Step 4

4

1.

Go to Step 5

Go to Step 6

5

1.
2.

Install a new
TCM. Go to
Step 6 after
repairs are made.

If DTC is active
with both the test
TCM and the
original TCM, do
not replace the
TCM. Review
Diagnostic Aids
for this DTC.
Begin diagnosis
again. Go to
Step 1

If the service outlet is authorized to use
the TCM Reflash software, recalibrate the
original TCM with the latest calibration and
software.
2. Once the TCM recalibration is complete,
use the Allison DOC® software to check for
active DTCs.
Is DTC P07CE active after recalibrating the
TCM?
Turn ignition OFF.
Install test the TCM and tighten the bolt to
2.0 – 3.2 N·m (18-28 lb in).
3. Install or reconnect OEM components and
connectors.
4. Start engine.
5. Using the Allison DOC® software, check for
active DTCs.
6. If DTC are not active with test the TCM
installed, then turn ignition off and reinstall
the original TCM.
7. Restart engine and check again for active
DTCs.
Is DTC P07CE active with original TCM and
inactive with test TCM?

Copyright © 2018 Allison Transmission, Inc. All Rights Reserved.

SIL 14-TR-18
September, 2018
Page 12 of 72

DTC P07CE Neutral At Stop Not Functioning (cont'd)
Step

Action

6

Acquire new a Allison DOC® snapshot while
driving vehicle under same conditions,
if possible, noted in failure records from
Step 1.
Did DTC P07CE return?
1.

Value(s)

Yes

No

Begin the
diagnosis again.
Go to Step 1

Repair complete.

Copyright © 2018 Allison Transmission, Inc. All Rights Reserved.

SIL 14-TR-18