2000 corvette
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From: Hickory NC
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Can you provide more details of your security problem?
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Thread Starter
7th Gear
Joined: Nov 2017
Posts: 7
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reply security issue
Hello and thank you further details are
1. Car starts if I disconnect and reconnect the battery
2 If I shut it off, longer than 5 minutes it will not restart (unless I disconnect & reconnect the battery)
3. Codes that came up are:
BORFA- U10968H U1016H and U1064H
Code 28TCS- 1255H
40BCM- B2527
99HVAC-B0446H
These are the codes that came up.
The car sat last winter with the battery connected, the battery went dead and now this is the problem
Thank you for your help :-)
1. Car starts if I disconnect and reconnect the battery
2 If I shut it off, longer than 5 minutes it will not restart (unless I disconnect & reconnect the battery)
3. Codes that came up are:
BORFA- U10968H U1016H and U1064H
Code 28TCS- 1255H
40BCM- B2527
99HVAC-B0446H
These are the codes that came up.
The car sat last winter with the battery connected, the battery went dead and now this is the problem
Thank you for your help :-)
What exactly is happening???
Cranks but does not start??
Does NOT crank??
If the problem is a SECURITY issue then the security light on the dash will remain illuminated when the key is left in the ON position for 10 or 20 seconds
Next time it will not start pull the codes and post them. List the H or C or HC that follows each 5 character code. List the codes under the sensor they show with. ie 10 - PCM or 28 - TCS or 40 - BCM ...... etc ..... If any sensor has NO COMM nest to it post that also.
If you have never pulled codes on your C5 here is how:
https://youtu.be/SviRjIsy9G4
Cranks but does not start??
Does NOT crank??
If the problem is a SECURITY issue then the security light on the dash will remain illuminated when the key is left in the ON position for 10 or 20 seconds
Next time it will not start pull the codes and post them. List the H or C or HC that follows each 5 character code. List the codes under the sensor they show with. ie 10 - PCM or 28 - TCS or 40 - BCM ...... etc ..... If any sensor has NO COMM nest to it post that also.
If you have never pulled codes on your C5 here is how:
https://youtu.be/SviRjIsy9G4
Thread Starter
7th Gear
Joined: Nov 2017
Posts: 7
Likes: 0
further details
Yes I can and thank you
Hello and thank you further details are
1. Car starts if I disconnect and reconnect the battery
2 If I shut it off, longer than 5 minutes it will not restart (unless I disconnect & reconnect the battery)
3. Codes that came up are:
BORFA- U10968H U1016H and U1064H
Code 28TCS- 1255H
40BCM- B2527
99HVAC-B0446H
These are the codes that came up.
The car sat last winter with the battery connected, the battery went dead and now this is the problem
Thank you for your help :-)
Hello and thank you further details are
1. Car starts if I disconnect and reconnect the battery
2 If I shut it off, longer than 5 minutes it will not restart (unless I disconnect & reconnect the battery)
3. Codes that came up are:
BORFA- U10968H U1016H and U1064H
Code 28TCS- 1255H
40BCM- B2527
99HVAC-B0446H
These are the codes that came up.
The car sat last winter with the battery connected, the battery went dead and now this is the problem
Thank you for your help :-)
Thread Starter
7th Gear
Joined: Nov 2017
Posts: 7
Likes: 0
reply security issue
Initially, the vehicle will NOT Crank.. until the battery is disconnected then reconnected after which the car then cranks (fires and will run) and starts. Again, thank you!
Thread Starter
7th Gear
Joined: Nov 2017
Posts: 7
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reply for security issue
Thank you will do this and get back to you :-)
QUOTE=8VETTE7;1596067852]Please try this the next time the car will not crank BEFORE you disconnect the battery.
Pull the codes BEFORE you disconnect the battery and post them again.
With the key in the ignition and in the ON position try to open/close the electric windows. Post back the results please.
The symptoms you have with NO RELATIVE codes being set may point to a BCM that might not be coming out of sleep mode by the normal means (opening a door or inserting the key into the ignition). The BCM is involved in operating the windows and should only do so if the BCM is NOT in sleep mode.
If the windows do function then there are likely other things that are causing the symptoms of NO Crank until you effectively reboot the BCM. (removing the battery cable or pulling and reinserting fuse #25 in the passenger foot well fuse box will reboot the BCM)[/QUOTE]
QUOTE=8VETTE7;1596067852]Please try this the next time the car will not crank BEFORE you disconnect the battery.
Pull the codes BEFORE you disconnect the battery and post them again.
With the key in the ignition and in the ON position try to open/close the electric windows. Post back the results please.
The symptoms you have with NO RELATIVE codes being set may point to a BCM that might not be coming out of sleep mode by the normal means (opening a door or inserting the key into the ignition). The BCM is involved in operating the windows and should only do so if the BCM is NOT in sleep mode.
If the windows do function then there are likely other things that are causing the symptoms of NO Crank until you effectively reboot the BCM. (removing the battery cable or pulling and reinserting fuse #25 in the passenger foot well fuse box will reboot the BCM)[/QUOTE]
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Thread Starter
7th Gear
Joined: Nov 2017
Posts: 7
Likes: 0
reply security issue
Please try this the next time the car will not crank BEFORE you disconnect the battery.
Pull the codes BEFORE you disconnect the battery and post them again.
With the key in the ignition and in the ON position try to open/close the electric windows. Post back the results please.
The symptoms you have with NO RELATIVE codes being set may point to a BCM that might not be coming out of sleep mode by the normal means (opening a door or inserting the key into the ignition). The BCM is involved in operating the windows and should only do so if the BCM is NOT in sleep mode.
If the windows do function then there are likely other things that are causing the symptoms of NO Crank until you effectively reboot the BCM. (removing the battery cable or pulling and reinserting fuse #25 in the passenger foot well fuse box will reboot the BCM)
Pull the codes BEFORE you disconnect the battery and post them again.
With the key in the ignition and in the ON position try to open/close the electric windows. Post back the results please.
The symptoms you have with NO RELATIVE codes being set may point to a BCM that might not be coming out of sleep mode by the normal means (opening a door or inserting the key into the ignition). The BCM is involved in operating the windows and should only do so if the BCM is NOT in sleep mode.
If the windows do function then there are likely other things that are causing the symptoms of NO Crank until you effectively reboot the BCM. (removing the battery cable or pulling and reinserting fuse #25 in the passenger foot well fuse box will reboot the BCM)
New codes are as follows:
BO RFA U1096 H
U1016 H
U1064 H
28 TCS C1255 H
40 BCM B2527 HC
99 HVAC B 0446 H
Thank you!
Thread Starter
7th Gear
Joined: Nov 2017
Posts: 7
Likes: 0
OK the answer to both questions is "yes" we also thought that there may be a problem with the chip in the key BUT tried both keys and get the same results...EVERY single time the battery is disconnected and reconnected the car starts right up ...no problems. The car was stored in a damp garage for about a year. There was some mildew on seats so I know that there was moisture could I have a corrosion of wires or could the computer have been affected by moisture?
None of those codes are related to starting issues.
One more set of test to try to determine if the issue is BCM failing to come out of sleep.
When you go to start the car turn the key to the ON position (NOT start position) and leave it there for about 10 seconds.
The gauges should sweep all the was clockwise and then back to resting position. Do they do that???
The SECURITY light on the dash should come on solid for a few seconds and then go out. Does it do that???
If they answers to the two questions are YES then the problem is NOT the BCM coming out of sleep mode and we will have to look at other possibilities like ignition switch, starter/starter solenoid or poor connections at major battery connection points.
One more set of test to try to determine if the issue is BCM failing to come out of sleep.
When you go to start the car turn the key to the ON position (NOT start position) and leave it there for about 10 seconds.
The gauges should sweep all the was clockwise and then back to resting position. Do they do that???
The SECURITY light on the dash should come on solid for a few seconds and then go out. Does it do that???
If they answers to the two questions are YES then the problem is NOT the BCM coming out of sleep mode and we will have to look at other possibilities like ignition switch, starter/starter solenoid or poor connections at major battery connection points.
