C/7 key fob recognition problem,NEED HELP

Reply Subscribe

Thread Tools

Search this Thread

Dec 17, 2020 | 02:06 PM

stillcrazy

Thread Starter

Burning Brakes

Joined: May 2009

Posts: 1,053

Likes: 194

From: So Cal

C/7 key fob recognition problem,NEED HELP

Ok, got a weird problem with my key fob. After setting overnight, my key fob won't unlock my door. If I unlock the trunk first then the key fob will open the door ,anyone got an answer on my C/7 vert.

Dec 17, 2020 | 02:55 PM

Elk

Le Mans Master

Joined: Dec 2000

Posts: 5,348

Likes: 3,319

Change the battery in the fob.

Also check the condition of the car's battery (what year is your car?).

Dec 17, 2020 | 03:09 PM

eboggs_jkvl

Moderator emeritus

Joined: Jun 2001

Posts: 18,599

Likes: 3,954

From: Jacksonville Florida BWO Dayton, Cincinnati, Bloomsbury NJ, Cincinnati

2015 C7 of the Year Finalist

Quote:

Originally Posted by Elk

Change the battery in the fob.

Also check the condition of the car's battery (what year is your car?).

This and change the battery in your 2nd FOB too. They usually croak at the same time regardless of usage of each.

Elmer

Dec 17, 2020 | 03:13 PM

RacerRik

Drifting

Joined: Sep 2019

Posts: 1,355

Likes: 635

From: St. Louis

The C7 key fobs eat batteries like no other fobs I have owned. Probably only get about two years out of each battery. And the fobs act goofy when the batteries get low. You can press the fob buttons and the functions work. But then the car does not see the fob when you try to start the car. And if you stick the fob in the "fob slot" on the steering column, the car will see it even though the battery is low.

As others said - change the fob batteries.

FYI - I measured the battery in my fob that was working goofy. It was at 2.86 volts. That is not terribly low for a 3 volt battery. The new battery was only 3.15 volts. But all the problems went away with the new battery.

Last edited by RacerRik; Dec 17, 2020 at 03:16 PM.

Dec 17, 2020 | 03:29 PM

stillcrazy

Thread Starter

Burning Brakes

Joined: May 2009

Posts: 1,053

Likes: 194

From: So Cal

2018

Dec 17, 2020 | 03:33 PM

stillcrazy

Thread Starter

Burning Brakes

Joined: May 2009

Posts: 1,053

Likes: 194

From: So Cal

If you replace the battery in the fob ,it will pitch the codes and you have to take it to the dealer to reset the codes and they charge for that.

Dec 17, 2020 | 03:35 PM

eboggs_jkvl

Moderator emeritus

Joined: Jun 2001

Posts: 18,599

Likes: 3,954

From: Jacksonville Florida BWO Dayton, Cincinnati, Bloomsbury NJ, Cincinnati

2015 C7 of the Year Finalist

Quote:

Originally Posted by stillcrazy

If you replace the battery in the fob ,it will pitch the codes and you have to take it to the dealer to reset the codes and they charge for that.

Nope, not true. You can change the FOB batteries daily and you will not need to do anything at the dealer.

Elmer

Last edited by eboggs_jkvl; Dec 17, 2020 at 03:36 PM.

Dec 17, 2020 | 03:38 PM

stillcrazy

Thread Starter

Burning Brakes

Joined: May 2009

Posts: 1,053

Likes: 194

From: So Cal

OK, here goes I am a watch maker and I change boat loads of watch batteries each week. and some times I get car fobs to change the batteries in. When I do them the customers complain they have to go back to the dealer to get the fob recoded.

Corvette Stories

The Best of Corvette for Corvette Enthusiasts

10 Ugly Corvettes That We Still Kinda Love

Joe Kucinski

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

Brett Foote

10 Things Every Corvette Owner Needs (2026 Edition)

Michael S. Palmer

8 Most "Only Corvette Owners Understand" Quirks and Problems

Pouria Savadkouei

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Joe Kucinski

How Much Horsepower Every Corvette Engine "LOST" in 1972

Joe Kucinski

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Michael S. Palmer

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Joe Kucinski

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Joe Kucinski

8 Coolest Corvette Pace Cars (and Replicas) of All Time

Verdad Gallardo

Dec 17, 2020 | 03:38 PM

RacerRik

Drifting

Joined: Sep 2019

Posts: 1,355

Likes: 635

From: St. Louis

My C7 is also a 2018. FOB batteries died already. And no, no codes were thrown. Just replaced the batteries and all was good again.

Dec 17, 2020 | 03:42 PM

#10

eboggs_jkvl

Moderator emeritus

Joined: Jun 2001

Posts: 18,599

Likes: 3,954

From: Jacksonville Florida BWO Dayton, Cincinnati, Bloomsbury NJ, Cincinnati

2015 C7 of the Year Finalist

Quote:

Originally Posted by stillcrazy

Dude, I'm telling you straight up, you can change the battery in the FOB and never need to see the dealer. If they are going to the dealer, they have other issues but it isn't relacing the FOB battery that caused the problem. You can get bad batteries out of the box, you can put them in upside down but just a simple battery replacement does NOT require any programming.

This information that I am giving is for the Corvette. Other cars are other cars and I don't know jack squat about them. I DO know about the C6 and C7 Corvette FOB.

Elmer

Last edited by eboggs_jkvl; Dec 17, 2020 at 03:46 PM.

Dec 17, 2020 | 03:44 PM

#11

stillcrazy

Thread Starter

Burning Brakes

Joined: May 2009

Posts: 1,053

Likes: 194

From: So Cal

Elmer, thank you and I will replace the battery. I know exactly which batter it is.

Dec 17, 2020 | 03:50 PM

#12

RacerRik

Drifting

Joined: Sep 2019

Posts: 1,355

Likes: 635

From: St. Louis

By the way, if you put the battery in upside down, it kills the battery. Don't ask me how I know.........

Dec 17, 2020 | 04:05 PM

#13

stillcrazy

Thread Starter

Burning Brakes

Joined: May 2009

Posts: 1,053

Likes: 194

From: So Cal

Ok, just replaced the battery and it still won't open the door on the first attempt. After several attempts it will finally open.

Dec 17, 2020 | 04:07 PM

#14

Elk

Le Mans Master

Joined: Dec 2000

Posts: 5,348

Likes: 3,319

If you have a voltmeter, a new 3V fob battery reads around 3.3V. Once it gets anywhere below 3V, car response is flaky.

An oddity I have run into is off-brand batteries can measure fine, but not work due to minute size irregularities. They appear to fit but do not make adequate contact. Thus I stick with brand name batteries for the fobs.

Dec 17, 2020 | 04:08 PM

#15

RacerRik

Drifting

Joined: Sep 2019

Posts: 1,355

Likes: 635

From: St. Louis

Assuming you have two fobs, do they both act the same way? If so, better check the cars battery.You should have at least 12.7 volts. More would be better....

Dec 17, 2020 | 04:09 PM

#16

Elk

Le Mans Master

Joined: Dec 2000

Posts: 5,348

Likes: 3,319

Quote:

Originally Posted by stillcrazy

Ok, just replaced the battery and it still won't open the door on the first attempt. After several attempts it will finally open.

Is this true with both fobs with new batteries?

Dec 17, 2020 | 04:11 PM

#17

stillcrazy

Thread Starter

Burning Brakes

Joined: May 2009

Posts: 1,053

Likes: 194

From: So Cal

Sounds like a trip to the dealer, QUESTION , what is the warranty life of a 2018 corvette battery.

Dec 17, 2020 | 04:18 PM

#18

Elk

Le Mans Master

Joined: Dec 2000

Posts: 5,348

Likes: 3,319

What is the resting voltage of the car's battery? The car's battery could be bad, but this is uncommon at this age.

Do both fobs act the same?

Any gremlins when you drive the car?

Dec 17, 2020 | 04:21 PM

#19

RacerRik

Drifting

Joined: Sep 2019

Posts: 1,355

Likes: 635

From: St. Louis

Quote:

Originally Posted by stillcrazy

Sounds like a trip to the dealer, QUESTION , what is the warranty life of a 2018 corvette battery.

It is not listed in the warranty manual. Therefore the default is there is no warranty coverage. It is considered a "wear / consumable" item.

Dec 17, 2020 | 04:29 PM

#20

Elk

Le Mans Master

Joined: Dec 2000

Posts: 5,348

Likes: 3,319

The car's battery may have its own separate warranty however.

Reply Share

First
Prev
1 / 2
Next
Last

Forum Jump