A8 TCM module removal - is car still driveable?

Jarek · Yesterday, 05:49 AM

Hello,

I have a situation where I want to remove a TCM from SS with A8 in order to unlock it and be able to minimize the shudder (by changing lock-up speed delta) however in the meantime I need to leave the car in at the shop to fix some body work issues.

Question can a car without TCM move around the parking lot at mechanic's (in an emergency or service mode)?
I have info that the older transmissions were able to work without TCM just allowing you using 3rd gear and reverse. Is that the case for A8?
I will appreciate a feedback.

BR,
Jarek

dmcmahan60 · Yesterday, 09:04 AM

I just paid the extra money to buy the unlocked TCM from HPTuners because my car was my daily and could not have it down for a week waiting on the TCM to be unlocked. I don't think if it does not communicate with the TCM that it will move or even start? I could be wrong. I paid $400 for the TCM unlocked and programmed from HPTuners. But you have to copy some of the calibration files from the stock TCM and put them on the new one.

Jarek · Yesterday, 09:39 AM

Thank you dmcmahan60.
In my case (as I am based in EU) I am actually travelling to US with my TCM to send it to HPTuners (to avoid any customs/taxation discussions and delay) so my options are limited.

Like I have said in my 1st message - my mechanic told me that old transmission were able to go in emergency/service mode.
I am curious if anybody had a similar situation.

Efi69Cam · Yesterday, 02:00 PM

The a8 will not function without the tcm, similar to how the engine will not run without the ecm.

Jarek · Today, 02:45 AM

Thank you Efi69Cam.
Again was that tested or is just assumed?
Sorry to be a bit harsh but looking for hard data.

dmcmahan60 · Today, 05:12 AM

I am pretty confident in saying that if the TCM is not there it will not start just like if there was no ECM it would not start.

Jarek · Today, 06:14 AM

Thank you dmcmahan60.
In that case I will need to test that.

Yesterday, 05:49 AM	#1
Jarek Drives: 2017 2SS Convertible Join Date: Mar 2021 Location: Warsaw, Poland, EU Posts: 94	A8 TCM module removal - is car still driveable? Hello, I have a situation where I want to remove a TCM from SS with A8 in order to unlock it and be able to minimize the shudder (by changing lock-up speed delta) however in the meantime I need to leave the car in at the shop to fix some body work issues. Question can a car without TCM move around the parking lot at mechanic's (in an emergency or service mode)? I have info that the older transmissions were able to work without TCM just allowing you using 3rd gear and reverse. Is that the case for A8? I will appreciate a feedback. BR, Jarek __________________ Camaro SS 2017 Convertible, 2SS trim, V8 6.2L 455HP 618Nm, A8, Silver Mods so far: K&N oil air filter, rear lamps EU conversion with sequential turn signal, exhaust modification to 4 tips (non-NPP), LED rear fog light (EU requirement), side-markers conversion to LED Mods planned: Morimoto LED lamps set (front)

Yesterday, 09:39 AM	#3
Jarek Drives: 2017 2SS Convertible Join Date: Mar 2021 Location: Warsaw, Poland, EU Posts: 94	Thank you dmcmahan60. In my case (as I am based in EU) I am actually travelling to US with my TCM to send it to HPTuners (to avoid any customs/taxation discussions and delay) so my options are limited. Like I have said in my 1st message - my mechanic told me that old transmission were able to go in emergency/service mode. I am curious if anybody had a similar situation. __________________ Camaro SS 2017 Convertible, 2SS trim, V8 6.2L 455HP 618Nm, A8, Silver Mods so far: K&N oil air filter, rear lamps EU conversion with sequential turn signal, exhaust modification to 4 tips (non-NPP), LED rear fog light (EU requirement), side-markers conversion to LED Mods planned: Morimoto LED lamps set (front)

Today, 02:45 AM	#5
Jarek Drives: 2017 2SS Convertible Join Date: Mar 2021 Location: Warsaw, Poland, EU Posts: 94	Thank you Efi69Cam. Again was that tested or is just assumed? Sorry to be a bit harsh but looking for hard data. __________________ Camaro SS 2017 Convertible, 2SS trim, V8 6.2L 455HP 618Nm, A8, Silver Mods so far: K&N oil air filter, rear lamps EU conversion with sequential turn signal, exhaust modification to 4 tips (non-NPP), LED rear fog light (EU requirement), side-markers conversion to LED Mods planned: Morimoto LED lamps set (front) Last edited by Jarek; Today at 04:34 AM.

Today, 06:14 AM	#7
Jarek Drives: 2017 2SS Convertible Join Date: Mar 2021 Location: Warsaw, Poland, EU Posts: 94	Thank you dmcmahan60. In that case I will need to test that. __________________ Camaro SS 2017 Convertible, 2SS trim, V8 6.2L 455HP 618Nm, A8, Silver Mods so far: K&N oil air filter, rear lamps EU conversion with sequential turn signal, exhaust modification to 4 tips (non-NPP), LED rear fog light (EU requirement), side-markers conversion to LED Mods planned: Morimoto LED lamps set (front)

Yesterday, 09:04 AM	#2
dmcmahan60 Drives: 2017 SS Join Date: Jan 2018 Location: Arab, AL Posts: 757 View My Garage	I just paid the extra money to buy the unlocked TCM from HPTuners because my car was my daily and could not have it down for a week waiting on the TCM to be unlocked. I don't think if it does not communicate with the TCM that it will move or even start? I could be wrong. I paid $400 for the TCM unlocked and programmed from HPTuners. But you have to copy some of the calibration files from the stock TCM and put them on the new one.

Yesterday, 02:00 PM	#4
Efi69Cam Drives: 2016 Camaro SS 2017 Yukon Denali Join Date: Jan 2020 Location: Colorado Posts: 112	The a8 will not function without the tcm, similar to how the engine will not run without the ecm.

Today, 05:12 AM	#6
dmcmahan60 Drives: 2017 SS Join Date: Jan 2018 Location: Arab, AL Posts: 757 View My Garage	I am pretty confident in saying that if the TCM is not there it will not start just like if there was no ECM it would not start.

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