J1939 EV implementation for GO compatibility

Learn how to use J1939 signals to support an EV integration.

For Medium-duty and Heavy-duty OEMs

This guide aims to help OEMs implement the J1939 signal set for GO device compatibility, and includes both mandatory and optional signal sets. For questions about the information in this document, or for additional clarification on how to implement a parameter, please reach out to your Geotab point of contact or send an email to evsoleng@geotab.com.

Note:

✱ NOTE: All parameters discussed in this document fall under the EV signals subset in the J1939 Digital Annex as set by SAE. The GO device also supports non-EV related parameters in J1939 Standard. If there is a particular parameter that you wish to implement and is not on this list, please reach out to your Geotab point of contact to check whether the parameter is supported with the GO device.

Glossary

Review the terms used in this guide.


Term	Meaning
AC	Alternating Current
BAM	Broadcast Announce Message
CAN	Controller Area Network
DC	Direct Current
Dec	Decimal
DT	Data Transfer
ECU	Engine/Electronic Control Unit
EV	Electric Vehicle
EVSE	Electric Vehicle Supply Equipment
FAQ	Frequently Asked Questions
Hex	Hexadecimal
HV	High Voltage
HVES	High Voltage Energy Source
HVESP1	High Voltage Energy Source Pack 1
HVESP2	High Voltage Energy Source Pack 2
HVESS	High Voltage Energy Storage System
Hz	Hertz
OBDII	On-board Diagnostic v2
OEM	Original Equipment Manufacturer
PGN	Parameter Group Number
RMS	Root Mean Square
SLI	Starting, Lighting, and Ignition
SPN	Suspect Parameter Number
VIN	Vehicle Identification Number

Version notes

Review the changes made to this guide.


Version number	Summary of change	Main contributor to the change
1.12	The first version to be tracked via Version notes
1.13	Clarified VIN request CAN ID 18EAFFxx	Muyun Cai

Implementation process

Learn the steps to set up, test, and check the EV signal set.

The J1939 EV implementation process typically takes 4 to 6 weeks. A public-facing list of electric vehicles (EVs) supported by Geotab are found here.

As an overview, the following steps will be taken to implement the J1939 EV signal set:

OEM agrees to adopt the J1939 EV signal set.
OEM sets up a test database in MyGeotab with assistance from an EV Solutions Engineer or Geotab point of contact, and creates user accounts for individuals who require access to the database.
OEM installs the GO device in the vehicle and adds the device to the test database with assistance from an EV Solutions Engineer or Geotab point of contact.

Note: Depending on the type of diagnostic port on your vehicle, you may require a harness. Please ensure you notify the Geotab point of contact that ships the test device to you. Geotab has various straight and T-harnesses for standard diagnostic ports.

Note: If your vehicle has a non-standard diagnostic port, please reach out to your Geotab point of contact or the EV Solutions Engineering team to determine the best method of integration.
OEM sets up their CAN network on the vehicle based on the J1939 EV signal set.

Note: Do not hesitate to reach out to your Geotab point of contact if you require additional test devices or additional resources during this step.
Once the vehicle has fully conformed to the signal set, please reach out to your Geotab point of contact or the EV Solutions Engineering team to initiate the data validation process (details here). Also, please inform the Geotab point of contact or EV Solutions Engineering team if you would like additional devices during this step to verify compliance on more than one vehicle or platform.
The Geotab team completes the data validation process and adds the vehicle to the public-facing list of fully supported electric vehicles. Please see here for more details.