Skip to main content
Skip table of contents

HGM CAN Bus Messaging

Most of HGM’s products use SAE J1939 standard messages as their “native” protocol, usually at a 500 kb data rate.

Attached to this page is a DBC file for the commonly used messages, along with the table below. Some things to be aware of:

  • All of the CAN arbitration ids used are 29 bit, not 11 bit, per J1939.

  • In the table below, the last byte of the CAN id is set to “03”, which is the J1939 address for the first transmission control ECU. 
    If you change this address in the controller setup, you will have to adjust the address accordingly.

  • In the attached DBC file, the last byte of the CAN id is marked as an "XX", indicating a wildcard. 
    If you have to hard code this number, use a "03", which is the J1939 address for the first transmission control ECU. 

  • The upper bits of a J1939 arbitration id are used for priority. In all cases, HGM uses the SAE recommended priority and that is shown in the table below.

  • Not all signals and messages are transmitted for all transmission and engine type combinations.   
    If you are connected to an engine control system over CAN, the messages that correspond to engine information (EEC1, EEC2) aren't sent, as they would be redundant. 

  • In J1939, an all ones bit combination is used to describe the "not available" situation, so if a bit field is all ones, then the system isn’t transmitting that signal.

  • For torque management, you will want to use the "shift in process" bits of ETC1.
    Not all transmission types transmit this signal.

  • Bytes are numbered 1-8, with 1 being the first byte in the CAN frame.

  • Bits are numbered 0 to 7, with 0 being the least significant bit in the byte.

CAN ID

Message Name

Cycle Time [ms]

Signal Byte No.

Signal Bit No.

Signal Name (SPN)

Signal Length [Bit]

Signal Default

Signal Not Available

Value

Name / Phys. Range

Function / Increment Unit

CF00203h

ETC1 Electronic Transmission

10

1

0

Transmission Driveline Engaged 

2

0

 

0

Driveline Disengaged

 

1

Driveline Engaged

2

Error

3

Not Available

1

2

Transmission Torque Converter Lockup Engaged

2

0

 

0

Torque Converter Lockup Disengaged

1

Torque Converter Lockup Engaged

2

Error

3

Not Available

1

4

Transmission Shift in Process

2

0

 

0

Shift is Not in Process

1

Shift in Process

2

Error

3

Not Available

1

6

Transmission Torque Converter Lockup Transition in Process

2

0

 

0

Transition is Not in Process

1

Transition is in Process

2

Error

3

Not Available

2

0

Transmission Output Shaft Speed

16

0

 

0..8031.88

0.125  rpm

6

0

Transmission Input Shaft Speed

16

0

 

0..8031.88

0.125  rpm

CF00303h

EEC2 Electronic Engine Controls

10

2

0

Accelerator Pedal Position 1

8

0

 

 

0..100

0.4  %

5

0

Accelerator Pedal Position 2

8

0

 

0..100

0.4  %

CF00403h

EEC1 Electronic Engine Controls

10

1

4

Actual Engine  Percent Torque High Resolution 4154 

4

0

 

 

0..0.875

0.125  %

2

0

Driver s Demand Engine  Percent Torque 512 

8

0

 

-125..125

%

3

0

Actual Engine  Percent Torque

8

0

 

-125..125

%

4

0

Engine Speed

16

0

 

0..8031.88

0.125  rpm

8

0

Engine Demand  Percent Torque 2 

8

0

 

-125..125

%

18F00503h

ETC2 Electronic Transmission

10

1

0

Transmission Selected Gear

8

0

 

 

-125..125

 

2

0

Transmission Actual Gear Ratio

16

0

 

0..64.255

0.001 -

4

0

Transmission Current Gear

8

0

 

-125..125

5

0

Transmission Requested Range 

16

0

 

ASCII TEXT

7

0

Transmission Current Range

16

0

 

ASCII TEXT

18F00C03h

ETC8 Electronic Transmission

50

1

0

Transmission Torque Converter Ratio

16

0

 

 

0..64.255

0.001 -

3

0

Transmission Clutch Converter Input Speed 5052

16

0

 

0..8031.88

0.125  rpm

18F02D03h

ACCS Acceleration Sensor

10

1

0

Lateral Acceleration Extended Range

16

0

 

 

-320..322.55

0.01  m/s^2

3

0

Longitudinal Acceleration Extended Range

16

0

 

-320..322.55

0.01  m/s^2

5

0

Vertical Acceleration Extended Range

16

0

 

-320..322.55

0.01  m/s^2

18FD9503h

TRF2 Transmission Fluids 2 

1000

1

4

Transmission Overheat Indicator

2

0

 

0

Transmission Overheat Indicator is Off

 

1

Transmission Overheat Indicator is On Continuously

2

Transmission Overheat Indicator is Flashing

3

Not Available

2

0

Transmission Torque Converter Oil Outlet Temperature

16

0

 

-273..1734.97

0.03125  deg C

18FE4A03h

ETC7 Electronic Transmission

50 

 1

0

Transmission Current Range Display Blank State

2

0

 

0

Not Blanked

 

1

Blanked

2

Error

3

Not Supported

1

2

Transmission Service Indicator 

2

0

 

0

Transmission Service Indicator is Off

1

Transmission Service Indicator is on Continuously

2

Transmission Service Indicator is Flashing

3

Not Available

1

4

Transmission Requested Range Display Blank State

2

0

 

0

Inactive; Transmission Requested Range display should NOT be blanked

1

Active; Transmission Requested Range display SHOULD be blanked

2

Reserved

3

No Action

1

6

Transmission Requested Range Display Flash State

2

0

 

0

Inactive; Transmission Requested Range display should NOT be flashing

1

Active; Transmission Range display SHOULD be flashing

2

Reserved

3

No Action

2

2

Active Shift Console Indicator

2

0

 

0

Primary Shift Console is Active

1

Secondary Shift Console is Active

2

Reserved

3

Not Available

2

4

Transmission Engine Crank Enable 

2

0

 

0

Cranking Disabled; engine cranking is prohibited by the transmission

1

Cranking Enabled; engine cranking is allowed by the transmission

2

Error

3

Not Available

2

6

Transmission Shift Inhibit Indicator

2

0

 

0

Inactive; shift is not inhibited

1

Active (on continuously); shift is inhibited

2

Active (flashing)

3

No Action

3

0

Transmission Mode 4 Indicator

2

0

 

0

Transmission Mode 4 Not Active

1

Transmission Mode 4 Active

2

Error

3

Not Available

3

2

Transmission Mode 3 Indicator

2

0

 

0

Transmission Mode 3 Not Active

1

Transmission Mode 3 Active

2

Error

3

Not Available

3

4

Transmission Mode 2 Indicator

2

0

 

0

Transmission Mode 2 Not Active

1

Transmission Mode 2 Active

2

Error

3

Not Available

3

6

Transmission Mode 1 Indicator

2

0

 

0

Transmission Mode 1 Not Active

1

Transmission Mode 1 Active

2

Error

3

Not Available

4

0

Transmission Requested Gear Feedback

8

0

 

-125..125

5

0

Transmission Mode 5 Indicator

2

0

 

0

Disable

1

Enable

2

Reserved

3

No Action

5

2

Transmission Mode 6 Indicator

2

0

 

0

Disable

1

Enable

2

Reserved

3

No Action

5

4

Transmission Mode 7 Indicator

2

0

 

0

Disable

1

Enable

2

Reserved

3

No Action

5

6

Transmission Mode 8 Indicator

2

0

 

0

Disable

1

Enable

2

Reserved

3

No Action

6

0

Transmission Reverse Gear Shift Inhibit Status

2

0

 

0

Reverse Gear Shifts are Currently Allowed

1

Reverse Gear Shifts are Currently Inhibited

2

Error

3

Not Available

6

2

Transmission Warning Indicator

2

0

 

0

Transmission Warning Indicator is Off

1

Transmission Warning Indicator is On Continuously

2

Transmission Warning Indicator is Flashing

3

Not Available

18FE8D03h

VEP2 Vehicle Electrical Power

100

1

0

Battery Potential Power Input 2

16

0

 

 

0..3212.75

0.05  V

3

0

ECU Power Output Supply Voltage 1

16

0

 

0..3212.75

0.05  V

5

0

ECU Power Output Supply Voltage 2

16

0

 

0..3212.75

0.05  V

7

0

ECU Power Output Supply Voltage 3

16

0

 

0..3212.75

0.05  V

18FEA403h

ET2 Engine Temperature 2

1000

3

0

ECU Temperature

16

0

 

 

-273..1734.97

0.03125  deg C

18FEAB03h

ETC6 Electronic Transmission

100

1

0

Recommended Gear

8

0

 

 

-125..125

 

2

0

Highest Possible Gear

8

0

 

-125..125

3

0

Lowest Possible Gear

8

0

 

-125..125

18FEF103h

CCVS1 Cruise Control Vehicle

100

2

0

Wheel Based Vehicle Speed 

16

0

 

 

0..250.996

0.00390625  km/h

18FEF803h

TRF1 Transmission Fluids 1 

1000

1

0

Clutch Pressure

8

0

 

 

0..4000

16  kPa

2

0

Transmission Oil Level 1

8

0

 

0..100

0.4  %

4

0

Transmission Oil Pressure

8

0

 

0..4000

16  kPa

5

0

Transmission Oil Temperature 1

16

0

 

-273..1734.97

0.03125  deg C

7

0

Transmission Oil Level 1 High Low

8

0

 

-62.5..62.5

0.5  L

8

0

Transmission Oil Level 1 Countdown Timer

4

0

 

0

Less than 1 Minute

1

One Minute

2

Two Minutes

3

Three Minutes

4

Four Minutes

5

Five Minutes

6

Six Minutes

7

Seven Minutes

8

Eight Minutes

9

Nine Minutes

10

Ten Minutes

11

Eleven Minutes

12

Twelve Minutes

13

Thirteen Minutes

14

Error

15

Not Available

8

4

Transmission Oil Level 1 Measurement Status

4

0

 

0

Conditions Valid for Transmission Oil Level Measurement

1

Conditions Not Valid - Setting Timer Still Counting Down

2

Conditions Not Valid - Transmission in Gear

3

Conditions Not Valid - Transmission Fluid Temperature Too Low

4

Conditions Not Valid - Transmission Fluid Temperature Too High

5

Conditions Not Valid - Vehicle Moving; Output Shaft Speed Too High

6

Conditions Not Valid - Vehicle Not Level

7

Conditions Not Valid - Engine Speed Too Low

8

Conditions Not Valid - Engine Speed Too High

9

Conditions Not Valid - No Request for Reading

10

Not Defined

11

Not Defined

12

Not Defined

13

Conditions Not Valid - Other

14

Error

15

Not Available

DBC File

HGM Standard Messages

JavaScript errors detected

Please note, these errors can depend on your browser setup.

If this problem persists, please contact our support.

Contact Support Close