Global B Network
Thread Starter
Le Mans Master
Joined: Jul 2000
Posts: 6,559
Likes: 4,501
From: North Dallas 40 TX
Global B Network
When Global B was first announced and there was talk of communications encryption, I thought it was the end all mods. However, apparently every think is not encrypted, as we have had several electronic mods come out:
A magnetic shock control unit that adjusts shock response curves.
Exhaust valve fake out.
A module to adjust throttle response.
Throttle body (maybe the electronics are the same?).
So clearly those things did not have encrypted communication. Maybe it is just between the ECU, TCU, BCM?
What other things don't have encrypted communications? Or what does, if that is easier.
A magnetic shock control unit that adjusts shock response curves.
Exhaust valve fake out.
A module to adjust throttle response.
Throttle body (maybe the electronics are the same?).
So clearly those things did not have encrypted communication. Maybe it is just between the ECU, TCU, BCM?
What other things don't have encrypted communications? Or what does, if that is easier.
Le Mans Master
Joined: Feb 2006
Posts: 5,979
Likes: 4,142
From: Kansas City, MO
The encryption is between different modules on the data buses. It's got nothing to do with the signal IO between a module and its sensors and actuators.
Tuners have had some success feeding fake values to the ECM to support some mods. But the question is how far can you push those fake values before you start tripping on the sanity checks the ECM has for those values.
Tuners have had some success feeding fake values to the ECM to support some mods. But the question is how far can you push those fake values before you start tripping on the sanity checks the ECM has for those values.
Last edited by Jeff V.; Feb 4, 2021 at 05:39 PM.
Thread Starter
Le Mans Master
Joined: Jul 2000
Posts: 6,559
Likes: 4,501
From: North Dallas 40 TX
The encryption is between different modules on the data buses. It's got nothing to do with the signal IO between a module and its sensors and actuators.
Tuners have had some success feeding fake values to the ECM to support some mods. But the question is how far can you push those fake values before you start tripping on the sanity checks the ECM has for those values.
Tuners have had some success feeding fake values to the ECM to support some mods. But the question is how far can you push those fake values before you start tripping on the sanity checks the ECM has for those values.
Le Mans Master
Joined: Feb 2006
Posts: 5,979
Likes: 4,142
From: Kansas City, MO
All of them 
There's 11 different CAN buses and an 5 ethernet buses. There's also a bunch of LIN buses, but those are really unlikely to be encrypted.
To add to the fun, there's a gateway module. All the pins on the OBD port go through the gateway. The gateway is a firewall that filters traffic from one bus to another, and also locks down the OBD port.
So if you want to try to program the ECM for example, you're going to have to get permission from the gateway before you can even start to talk directly to the ECM.
Or you can pull the ECM out of the car every time you want to make a change. Just have your jack handy. It's underneath the car in the center tunnel.
There's 11 different CAN buses and an 5 ethernet buses. There's also a bunch of LIN buses, but those are really unlikely to be encrypted.
To add to the fun, there's a gateway module. All the pins on the OBD port go through the gateway. The gateway is a firewall that filters traffic from one bus to another, and also locks down the OBD port.
So if you want to try to program the ECM for example, you're going to have to get permission from the gateway before you can even start to talk directly to the ECM.
Or you can pull the ECM out of the car every time you want to make a change. Just have your jack handy. It's underneath the car in the center tunnel.
Last edited by Jeff V.; Feb 5, 2021 at 10:44 AM.
Melting Slicks
Joined: Aug 2003
Posts: 2,232
Likes: 2,153
From: Cary NC
Thread Starter
Le Mans Master
Joined: Jul 2000
Posts: 6,559
Likes: 4,501
From: North Dallas 40 TX
All of them
There's 11 different CAN buses and an 5 ethernet buses. There's also a bunch of LIN buses, but those are really unlikely to be encrypted.
To add to the fun, there's a gateway module. All the pins on the OBD port go through the gateway. The gateway is a firewall that filters traffic from one bus to another, and also locks down the OBD port.
So if you want to try to program the ECM for example, you're going to have to get permission from the gateway before you can even start to talk directly to the ECM.
Or you can pull the ECM out of the car every time you want to make a change. Just have your jack handy. It's underneath the car in the center tunnel.
There's 11 different CAN buses and an 5 ethernet buses. There's also a bunch of LIN buses, but those are really unlikely to be encrypted.
To add to the fun, there's a gateway module. All the pins on the OBD port go through the gateway. The gateway is a firewall that filters traffic from one bus to another, and also locks down the OBD port.
So if you want to try to program the ECM for example, you're going to have to get permission from the gateway before you can even start to talk directly to the ECM.
Or you can pull the ECM out of the car every time you want to make a change. Just have your jack handy. It's underneath the car in the center tunnel.
Le Mans Master
Joined: Feb 2006
Posts: 5,979
Likes: 4,142
From: Kansas City, MO
So basically we are limited to sensor side adjustments, that work until the ECU has enough and protection decision points move to protect parts, like RPM fuel cutoffs, torque limiting to protect the known trans limits. I am surprised those experimenting with turbos, haven't already hit those. Maybe once GM Parts gets an opportunity for a crate engine, maybe we can get a standalone ECU that can be adjusted.
