I am at a loss on getting my speed brake to work. I have tried everything recommended by tech support to date and am still having issues. The entire system has been installed and removed 3 times and all Banks parts replaced and the problem still exists.


The speed brake is installed on:

2006 Chev 2500HD, Duramax LBZ
Six gun tuner installed for about 7 months, upgraded to IQ with Speed Brake

Aftermarket radio, with Bluetooth and backup camera.

The problem is as follows:

1.When the speed brake is enabled and actively stopping the truck, the ID display freezes (all data static) and must be rebooted to work again. This happens about 30% of the time. When this occurs the speed brake and six gun still works and the control modules both have a solid green light. The IQ interface module (banks to GM buss) has a single light flashing.
2.When driving the truck the transmission will suddenly go to neutral, the truck display will display “shift pattern inhibited” and the shift selector light will flash. On several occasions, when the transmission will goes into natural, a large clunk can be heard and it feels like the transmission fell out of the truck.
oThis problem is cleared by shifting to neutral and then back into drive
oTruck is OK afterwards, no limp mode and no power cycle required
oThis problem appears to be independent of speed, load, RPM or anything else I can identify. It has happened driving on the interstate, stopping, starting off from a red light
oThis problem occurs even when the speed brake is not enabled (mode=off) , although it is not as frequent. I pulled the fuse on the speed brake last week and have not had any troubles with the truck. I plugged the fuse in this morning and the error came up again, so I am driving with the fuse out now (no problems).


Any one else had problems getting it to work? Banks has no idea and I am ready to give up on the whole thing!

In my past experience, flaky codes, sudden loss of function, etc, are commonly caused by poor ground connections. Can't tell specifically if this is your problem, but I would find all the ground wire connections on the speed brake controller and route them (without twiston wire nuts or crimped connectors - solder everything) to a good chassis. Don't ground to the engine. Go to the chassis.

Just a thought...

-AC

Thanks for the advise. I think the speed brake only has one ground point under the fuse box. I am going to run an additional ground wire from that point to the chassis and retest.
Thanks

Ran additional grounding from banks grounding wire to firewall of truck and soldered power connection to fuse but still having same issue.

So, you're talking about two problems here right... 1, the truck pops into neutral while drving, and 2, the Dash IQ display freezes up.

Do these things always happen at the same time?

They have never happened together. Banks recently sent me a new control control module and since then the display has not locked up, but the transmission still is screwing up.

When the error occurs it's like it shifts to neutral and occasionally then tries to shift to too low of a gear or reverse; loud bang and it feels like I hit a stump with the differential. It only hits once and the truck coasts along ok. I shift to neutral then back into drive and it is fine. only happens with the speed brake is powered.

I can't get anything out of Banks. So far their technical support leaves a lot to be desired, which surprised me. To date they have sent me every replacement part for the system, one part at a time, but really has not spent ant time troubleshooting the problem.

I am at a point where I am willing to say it just does not like me or my truck, but Banks will not take it back until their chief troubleshooter approves it. Spent the last 2 weeks trying to speak to him but no luck. Posted on this forum to see if anyone had a similar problem or troubleshooting tips.

They have never happened together. Banks recently sent me a new control control module and since then the display has not locked up, but the transmission still is screwing up.

When the error occurs it's like it shifts to neutral and occasionally then tries to shift to too low of a gear or reverse; loud bang and it feels like I hit a stump with the differential. It only hits once and the truck coasts along ok. I shift to neutral then back into drive and it is fine. only happens with the speed brake is powered.

I can't get anything out of Banks. So far their technical support leaves a lot to be desired, which surprised me. To date they have sent me every replacement part for the system, one part at a time, but really has not spent ant time troubleshooting the problem.

I am at a point where I am willing to say it just does not like me or my truck, but Banks will not take it back until their chief troubleshooter approves it. Spent the last 2 weeks trying to speak to him but no luck. Posted on this forum to see if anyone had a similar problem or troubleshooting tips.


I have a 2007 LBZ dually with the banks speedbrake. When I had it on for 2weeks with no problems and then bang it happened. I was coming to a stop light and had the Speedbrake on speed control mode at 35mph. It shifted down to 2nd and stayed there. I pulled over ,shut the speedbrake off, looked at all the wiring,pulled the Speedbrake fuse,and took off without any problems. I checked all wiring again the next day,and found the Speedbrake fuse wiring was pinched under the fusebox. I then freed it and cut a small place in the fusebox to fish the fuse wire through. I fixed the wire and reinstalled it and no more problems.

I also found a transmission leak coming through the main transmission connector at the same time. So when I pulled the main trans. connector there was fluid inside the connector,which would end up on the wiring harness outside of the transmission. I cleaned the fluid out and off of everything then put the trans. connector back on. I'm not sure if this had anything to do with my problem,but I don't think so. I think it was the pinched Speedbrake fuse wiring. The dealer did replace the internal wiring harness in the tranny. Of course ,I took off the Speedbrake before the warranty work. I don't have a warm place to work so I'll put the Speedbrake on in the spring. I won't need it until my new 5/w arrives in the spring anyway.

I don't know if this is your problem,but thought it wouldn't hurt to post it anyway. Hope you can fix your problems, because I think the Speedbrake is a good idea for saving your truck brakes. Also a safe way to tow a heavy 5/w through the mountains like I'm going to next summer.

Good Luck! orkirk

The speedbrake with iQ has to have version 2 on the six gun to work correctly. You can download that from our website.

Thank for the info JBarker, but the problem exists even when only the speed brake is installed (six gun unwired).


http://www.scosche.com/ecom/images/product/538.12632.600x400.inteerface_box_5.jpg Speed Brake Killer !


Played around this weekend and got the speed brake to work. I have an aftermarket radio and it appears the Banks speed brake does not like the interface module for the radio.

I had a Scosche GMLAN2SR installed on the radio to generate the chime and interface the radio with the GM OBDII. Apparently there is a compatibility issue between this module and the speed brake, because without it the speedbrake works fine. Replaced the Scosche with a Metra and now I have radio, speed brake and six gun.

Seems crazy that the speed brake would get interference from this module and decide to shift the transmission to an inappropriate gear.:banghead:

Had 1 problem with "shift pattern Inhibited". The Allison went to Neutral and "D" indicator flashing while towing my 14,000 lb. trailer at 68 mph with stock cruise control on and Banks Speed Brake turned on. I pulled all of the electrical plugs used to connect the Banks power Pack and Banks Brake apart and inspected the pins I found several pins pushed back into the plug at the "male" side of the connector going back to the GM ECU. I think the "short" pins could have caused a problem because they where not making a good connection into the female plug. I found at least 15 pins that had to be snappen back into place but only on one plug. It must be done very carefully with long nose pliers, if you break a pin you will have a much worse problem. I have been running my Banks Brake for about 2 years and this is the 1st real problem I have had with it on all kinds for terrain and towing. To clear the condition temporarily I shifted back to "N" and back to "D". I did not check the electrical connectors until I returned home and the truck cooled.

2007 GMC Sierra LBZ 3500 SWR Ext Cab
Banks Air Cleaner, Banks exhaust, Banks Ottomind, Banks Speed Brake and Banks IQ

i have tried 2 harnesses and still have a problem. It is saying service 4 wheel drive and doesnt have the bar under the gear selected, therefore i cant start the truck. If i unplug the trans harness and plug the fgactory back in then its fine. Even left all other connections done. Kind of baffled on it and not getting any other answers other than it must be a harness. I have efi live and stuff but was assured it would work. Kinda dissapointed. Really wanted to use it but also out 1ooo bucks now...IDEAS??????????

i have tried 2 harnesses and still have a problem. It is saying service 4 wheel drive and doesnt have the bar under the gear selected, therefore i cant start the truck. If i unplug the trans harness and plug the fgactory back in then its fine. Even left all other connections done. Kind of baffled on it and not getting any other answers other than it must be a harness. I have efi live and stuff but was assured it would work. Kinda dissapointed. Really wanted to use it but also out 1ooo bucks now...IDEAS??????????


http://www.dieselplace.com/forum/showthread.php?t=393932

All fixed now:D Have you had a chance to try it on high yet?

Thank for the info JBarker, but the problem exists even when only the speed brake is installed (six gun unwired).


http://www.scosche.com/ecom/images/product/538.12632.600x400.inteerface_box_5.jpg Speed Brake Killer !


Played around this weekend and got the speed brake to work. I have an aftermarket radio and it appears the Banks speed brake does not like the interface module for the radio.

I had a Scosche GMLAN2SR installed on the radio to generate the chime and interface the radio with the GM OBDII. Apparently there is a compatibility issue between this module and the speed brake, because without it the speedbrake works fine. Replaced the Scosche with a Metra and now I have radio, speed brake and six gun.

Seems crazy that the speed brake would get interference from this module and decide to shift the transmission to an inappropriate gear.:banghead:

Is your speedbrake still working. Mine is doing the exact same thing as far as the shift range inhibited. I don't have the scosche and I don't have the six gun. It has worked fine for about 18 hours of use until tonight. I don't use it except when I tow my camper. I don't like what I'm reading so far.