1>4 shift light
Thread Starter
Heel & Toe
Joined: Nov 2015
Posts: 19
Likes: 0
1>4 shift light
I have a C6 2011 Grand Sport...When driving sometimes, If I'm in first gear and only go about 15 miles per hour the 1>4 shift light flashes on and it won't allow me to shift to second gear, third or fifth gear. How do I disengage this feature when it activates?
Instructor
Joined: Jul 2000
Posts: 242
Likes: 33
From: MN
Pro
Joined: Dec 2016
Posts: 626
Likes: 118
From: Indianapolis
A very annoying feature, IMO. The skip shift eliminator was my very first mod I did when I got my 08Z.
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Race Director
Joined: Jul 2007
Posts: 17,736
Likes: 1,210
From: Aiken, SC
St. Jude Donor '13 thru '26
I had a Compliance Parts one on my C5 and it turned off the annoying light as well. Does the Mid America model turn off the light? Doesn’t say in the listing so I’m assuming not.
Le Mans Master
Joined: May 2016
Posts: 7,107
Likes: 1,546
From: Florida
With a tune option, CAGS is eliminated so the ECU never sees a threshold met to generate both the signal voltage and the light. The six parameters that all need to be met are:
Disable TPS
Min Coolant
Enable speed
Disable speed
Enable baro
Disable baro
The easiest tune method to disable CAGS so it'll never send a voltage signal or light is to change the Min coolant temp threshold. The factory setting is 171*F. Most tuners set this to the maximum 493*F, which is never met, of course, so CAGS never functions. Manipulating one or more of these 6 parameters is the only way to disable both CAGS' light and voltage signal.
Last edited by BlindSpot; Jun 25, 2018 at 10:23 AM.
Burning Brakes
Joined: Apr 2015
Posts: 1,106
Likes: 192
From: El Cajon Ca.
The OM explains it all. If you want to shift to second, give it a little more gas and when the light goes out, shift to any gear you want.
I've owned my manual C6 for almost four and a half years and have seldom been locked out of shifting to second. Definitely not a big a deal for me.
I've owned my manual C6 for almost four and a half years and have seldom been locked out of shifting to second. Definitely not a big a deal for me.
Last edited by Batman75; Jun 25, 2018 at 10:23 AM.
Team Owner
Joined: May 2004
Posts: 82,175
Likes: 1,319
From: McKinney TX
St. Jude Donor '21-'22-'23-'24
Read your owner's manual:
Page 5-22:
Page 5-22:
This light comes on when:
. The engine coolant temperature
is higher than 76°C (169°F),
. The vehicle is going 24 to
31 km/h (15 to 19 mph) and
. The vehicle is 21 percent throttle
or less.
. The engine coolant temperature
is higher than 76°C (169°F),
. The vehicle is going 24 to
31 km/h (15 to 19 mph) and
. The vehicle is 21 percent throttle
or less.
Last edited by Vette_DD; Jun 25, 2018 at 11:46 AM.
Melting Slicks
Joined: Jan 2017
Posts: 2,706
Likes: 897
From: CONCORD CA.
cags
a lot of questions presented here, on in the manual.
with this being the C6 section, I'm guessing that most the cars were purchased used.
as such, the manual may or may not have made the transfer to the "new' owner.
regardless, picking up a manual is easy enough, and has valuable info.
changing the cags fuse takes about 2 seconds.
the only benefit of the cags, is supposedly better mileage.
if that's what you want, then no changes.
if it bugs you, spend the $15 and switch it out.
with this being the C6 section, I'm guessing that most the cars were purchased used.
as such, the manual may or may not have made the transfer to the "new' owner.
regardless, picking up a manual is easy enough, and has valuable info.
changing the cags fuse takes about 2 seconds.
the only benefit of the cags, is supposedly better mileage.
if that's what you want, then no changes.
if it bugs you, spend the $15 and switch it out.
Advanced
Joined: Oct 2014
Posts: 72
Likes: 18
From: South Carolina
If you are OK with having the light but being allowed to shift any way you want, you should do a search for "cags fuse method". It is replacing your CAGS fuse under the hood with a blown LED fuse (sometimes called Smart Glow). The LED allows enough current to make your ECU think everything is fine, but not enough current to activate the solenoid in your transmission. This cost me $2.50 and I didn't have to get under the car. It worked great.
If you really don't like the light, you have to get the ECU tuned to disable it. Much more than $2.50 but worthwhile if you have other mods.
If you really don't like the light, you have to get the ECU tuned to disable it. Much more than $2.50 but worthwhile if you have other mods.
Safety Car
Joined: Feb 2016
Posts: 4,425
Likes: 1,377
From: SC
If you are OK with having the light but being allowed to shift any way you want, you should do a search for "cags fuse method". It is replacing your CAGS fuse under the hood with a blown LED fuse (sometimes called Smart Glow). The LED allows enough current to make your ECU think everything is fine, but not enough current to activate the solenoid in your transmission. This cost me $2.50 and I didn't have to get under the car. It worked great.
If you really don't like the light, you have to get the ECU tuned to disable it. Much more than $2.50 but worthwhile if you have other mods.
If you really don't like the light, you have to get the ECU tuned to disable it. Much more than $2.50 but worthwhile if you have other mods.
Le Mans Master
Joined: Jan 2017
Posts: 6,134
Likes: 1,962
From: Morris County New Jersey
I with you. I don't agree with the more throttle method. I want to shift when I want to shift. End of story. Even though it would not happen very often, why should I have to adjust the way I drive to try an avoid the skip-shift when I can just eliminate it and never have to worry about it again.
Burning Brakes
Joined: Jan 2017
Posts: 1,122
Likes: 199
From: TX
I with you. I don't agree with the more throttle method. I want to shift when I want to shift. End of story. Even though it would not happen very often, why should I have to adjust the way I drive to try an avoid the skip-shift when I can just eliminate it and never have to worry about it again.
Le Mans Master
Joined: May 2016
Posts: 7,107
Likes: 1,546
From: Florida
The fuse or the trans resistor bypass harness are the two more economical ways of eliminating the CAGS but the dash light will still illuminate (no big deal). The tune option is the cleanest, but the most expensive if that is all you are doing. I'd have to charge $100 to do just that BC tune credits cost that much. However, if you're getting a tune anyway, just ask the tuner if he can add the CAGS delete to the tune. I don't think many tuners will charge extra for it. If I were doing a tune and already there, I could change one of the CAGS parameters in less than 2 minutes....but not worth $100 on its own.
Last edited by BlindSpot; Jun 25, 2018 at 06:56 PM.