Hello all,

Two days ago I purchased a 2001 C5 and wish I would have purchased sooner! I was given two key fobs from the dealer and was told that they would need to be programmed and the sales guy said i'ts a super easy fix and to use youtube to find out how to do it. Said that replacing batteries and other things can cause the fobs to no longer work with the vehicle, so knowing how to do it myself would be beneficial.

I have tried the proper way to sync the fob. Vehicle to ON, options till clear screen, hold reset, hit again, then hold lock and unlock to pair. No success. Figured that maybe there was something wrong with the fobs themselves, but opened them up and did not find any damage, loose connections, or any other problems. I've seen the videos on here about soldering components back that are loose or clearing it out, but there are no issues on that end. The dealer put two new batteries in both of them (watched him do it) and they are on their correct sides. I took that to mean that the fobs themselves had just 'died' and were no longer going to work.

Ordered two new ones off of amazon that would fit the vehicle, but those also will not pair. Once I am on the screen that says hold lock + unlock, I never get a response after that. I have searched this forum and others for answers, but I can not get one. I have seen some people say that if you are having TPMS issues, which I currently am, that can cause an issue. But I have also seen people say that does not matter and have watched videos where people hit reset to clear that code and then go on to pair new fobs. I can hold the fobs for minutes, until the screen will go off that pairing menu and nothing happens. I have tried standing outside of the vehicle and holding lock and unlock as I have read elsewhere, and nothing. I'm at a total loss of what to do at this point and intend on calling the dealer, but didn't know if someone else had experienced this and found a resolution. Thanks all and happy to be part of the club.

 

Moved to C5 Tech.

 

If you are having TPMS issues as well as the FOB's not working the cars receiver module has probably failed. It is located underneath a panel in the roof piller on the drivers side, as the name implies it receives signals from the fob and the TPMS sensors.

 

Thanks for the reply. Is there any way to do a simple diagnostic to determine if this is the cause, or is purchasing a new part and replacing the only way?

Quick google search appears that these are going to be difficult to find. There's a corvette specific shop here locally that I may take it to and see their thoughts/if they have spare parts.

 

Whats the part number on the two fobs the dealer gave you and the two you purchased.

 

Dealer FOB part numbers are 25695954 KOBLEAR1XT

FOBs that I purchased are replacements for 25695954 and/or 25695955 KOBLEAR1XT

I made sure that they were the proper replacements

 

From my 2000 manual.

To match transmitters to your vehicle:

1. Turn the ignition key to ON.

2. Clear any warning messages on the Driver

Information Center (DIC) by pressing the

RESET button.

3. Press the OPTIONS button on the DIC several times

until the blank page is displayed, then press and hold

the RESET button for two seconds.

4. When the message FOB TRAINING is displayed,

push the RESET button once. The message

HOLD LK + UNLK 1ST FOB in the DIC

will be displayed.

5. Press and hold the LOCK and UNLOCK buttons on

the transmitter simultaneously for 15 seconds.

6. When a transmitter is learned (matched), the DIC

will display FOB LEARNED and then prompt you

to learn the next transmitter.

7. Repeat Steps 5 and 6 for each additional transmitter.

8. Remove the key from the ignition.

 

As stated, I have done all of that. Once I get to the HOLD LK + UNLK 1ST FOB in the DIC and I try that process, I get no response. I get no FOB LEARNED or any other message. That applies to not only the FOBs from the dealer, but also the new ones that I purchased. I've held all 4 different FOBs for at least a minute and get nothing.

 

Because the C5 is known for its electrical anomolies, consider disconnecting the negative ground from the battery for 10 minutes and reconnect and do the relearn process again. This disconnect process sometimes works with other stuff in the C5 (like doing for computers to reboot). Just a thought.

 

You are certainly correct on the electrical anomalies!! There are Gremlins in the C5 electronics GM never dreamed of. Sometimes I think the TV show "Ghost Adventures" would learn a few things by locking themselves in my C5 all night!!!!

 

Just make sure you follow the procedure EXACTLY, or it won't work. I once dropped one of my C5s OEM FOBs, and it has never worked again. They're pretty delicate, and can be fussy. I have a 2000 Vert, and my receiver is in the driver's side of the car, behind the front seat/in the trunk area. I remain in the drivers seat when pairing my FOBs to the car......

 

I will give that a shot tonight. This is pretty much the only thing that I have not tried, hopefully it resolves the issue.

 

I spent about an hour last night going through every step carefully. Even read that you have to power off the radio, and have tried that. With all 4 FOBs. Hopefully disconnecting the negative of the battery does the trick.

 

Don't know if following info applies to ALL MY C5s, but it applies to my 2000 Vert. I can never get a TPMS reading on first start of the day, until car has gone at least 10-15mph. I think all years are that way, but not 100% sure. So if you're not getting a TPMS reading while stopped, try driving the car, then check the DIC while moving at 35-40mph. If all you get are xxx, or - - -, as stated earlier, you may have a bad receiver. Hard to believe all 4 remotes won't work, so it's looking like a bad receiver......

 

The TPMS sensors go to sleep after sitting for some time. They wake up after the tires start rotating.

I haven't read it anywhere on the thread, but has the OP stated that his TPMS is reporting tire pressure numbers, or just reporting XXXX's The receiver in the rear hatch area may be disconnected or defective.The key fobs signals are transmitted to this receiver.

 

I was in the same boat with my car until I went to a local locksmith. He couldn’t program my NEW key fobs i had ordered on ebay, they were the correct part numbers. He had a used OEM fob off of another gm vehicle and it worked first try. I slapped the new case onto the old internals and am enjoying my fob. Hope this helps.

 

Yes, I agree. What I'm trying to do is determine how the OP has determined the TPMS isn't working! As we know, you'll get no reading when sitting at a stop on the first start of the day.

 

Sorry for just now getting back, haven't been able to do any further trouble shooting until now. I just disconnected the negative for the battery and am going to let it sit for half an hour and reconnect to see if that does anything based on a comment above.

As for the TPMS sensors...there were no issues with them when I bought the vehicle. I had an hour drive home after purchasing and about 15 minutes before getting home the sensor notification came on. Since then, every single time that I turn the vehicle on, whether it's the first start of the day or the fifth etc, I get the notification that they need serviced.

I have not tried checking and reading the DIC while going 35+mph but I will try that today as well.

I see two different comments that the receiver for the transmitter, if bad, could be in a panel in the roof pillar on the driver side, but also that it could be in the rear hatch? Does anyone have an exact location and how to get access to it? Thanks all

 

Update:

Removing the negative for the battery and waiting half an hour did not change anything. Still unable to pair all 4 FOBs, so I'm going to assume that it has something to do with the transmitter either being bad or disconnected. Any help with that would be greatly appreciated.

What is interesting is that the TPMS service reading was no longer there after putting the vette to ON when trying to pair the FOBs. Whether it comes back after driving or not, I won't know until later today. But that is gone...for now. I'm expecting that it will come back.

 

I belive you ment to say receiver module as it receives signals from the fob and TPMS senders from the tires. The receiver then sends that information on the seriel data system to the BCM. Might try to find out what fuse powers that module, you also can find a used receiver from Vette Nuts a corvette salvage dealer.