1>4 Gear Shift Light???
Thread Starter
4th Gear
Joined: Dec 2006
Posts: 4
Likes: 0
1>4 Gear Shift Light???
I just bought a '07 C6 and I notice that @ around 1800 RPM (1st gear) to about 2500 RPM a "1>4" light flashes indicating to change from 1st gear to 4th gear. After 2500 RPM the light turns off. I have also noticed this occurs after the car temperature reaches above 170. I just want to know if there is anyone else who is experiencing this. Is there anything wrong with my Vette or is this a feature for fuel effeciency only?
Intermediate
Joined: Sep 2006
Posts: 29
Likes: 0
From: Houston Texas
You can do a search and find a lot of discussion on this topic. GM did this to boost its mpg ratings and avoid gas guzzler tax. It's annoying but you can purchase and install a little device called shift eliminator. It can be found at the various vendors online for about $20. Alternatively you can rev past the 1-4 shift zone.
Retired & lovin' it!
Joined: Mar 2005
Posts: 4,472
Likes: 545
From: Jackson NJ
I presume you have a manual transmission...did you also notice that when the light comes on, the tranny forces you to shift from 1st to 4th. This is the so-called "CAGS" servo kicking in. This tranny lock out can be real annoying, especially when driving in traffic.....but not to worry, there is a cheap & easy solution. Search the Forum for "CAGS Eliminator". It an inexpensive device (like $20) sold by several of the Forum vendors. Device is connected into the harness atop the trans-axle.....instructions are easy to follow. The tranny lock-out solenoid will be defeated, but the instrument panel light will still come on. The whole purpose of this ridiculous piece of engineering is to allow the C6 to pass the Federal fuel mileage course with a sufficiently high rating to avoid the "gas guzzler" tax, so I guess installing a CAGS Eliminator is a small price to pay. 
Melting Slicks
Joined: Sep 2006
Posts: 2,976
Likes: 1
From: Santee California
I presume you have a manual transmission...did you also notice that when the light comes on, the tranny forces you to shift from 1st to 4th. This is the so-called "CAGS" servo kicking in. This tranny lock out can be real annoying, especially when driving in traffic.....but not to worry, there is a cheap & easy solution. Search the Forum for "CAGS Eliminator". It an inexpensive device (like $20) sold by several of the Forum vendors. Device is connected into the harness atop the trans-axle.....instructions are easy to follow. The tranny lock-out solenoid will be defeated, but the instrument panel light will still come on. The whole purpose of this ridiculous piece of engineering is to allow the C6 to pass the Federal fuel mileage course with a sufficiently high rating to avoid the "gas guzzler" tax, so I guess installing a CAGS Eliminator is a small price to pay.
Burning Brakes
Joined: Aug 2006
Posts: 877
Likes: 0
From: Helotes Texas
I just bought a '07 C6 and I notice that @ around 1800 RPM (1st gear) to about 2500 RPM a "1>4" light flashes indicating to change from 1st gear to 4th gear. After 2500 RPM the light turns off. I have also noticed this occurs after the car temperature reaches above 170. I just want to know if there is anyone else who is experiencing this. Is there anything wrong with my Vette or is this a feature for fuel effeciency only?
Pro
Joined: Dec 2004
Posts: 530
Likes: 2
From: Colorado Springs CO
I just bought a '07 C6 and I notice that @ around 1800 RPM (1st gear) to about 2500 RPM a "1>4" light flashes indicating to change from 1st gear to 4th gear. After 2500 RPM the light turns off. I have also noticed this occurs after the car temperature reaches above 170. I just want to know if there is anyone else who is experiencing this. Is there anything wrong with my Vette or is this a feature for fuel effeciency only?
One-to-Four Shift Light
(Manual Transmission)
When this light comes on,
you can only shift from
FIRST (1) to FOURTH (4)
instead of FIRST (1) to
SECOND (2).
You must complete the shift into FOURTH (4) to turn
off this feature. This helps you get the best possible
fuel economy.
After shifting to FOURTH (4), you may downshift to a
lower gear if you prefer.
Notice: Forcing the shift lever into any gear except
FOURTH (4) when the 1 TO 4 SHIFT light comes
on may damage the transmission. Shift only from
FIRST (1) to FOURTH (4) when the light comes on.
This light will come on when:
• The engine coolant temperature is higher than
169°F (76°C),
• you are going 15 to 19 mph (24 to 31 km/h) and
• you are 21 percent throttle or less.
HTH!
Last edited by fenderowner; Jan 2, 2007 at 06:07 PM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
Get the shift elimnator from southerncarparts.com. It takes five minutes to install and eliminates the shift block, but not the light. It only improves the "corvette experience"!!!
Race Director
Joined: Aug 2005
Posts: 13,592
Likes: 187
From: Hudson WI
NCM Sinkhole Donor
