No start
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No start
C5 65K. Was running fine then got "service vehicle soon" followed by "security light" No start, several sets of codes each following battery disconnect overnight. Latest codes:40BCM: No Comm., 58SDM
1000HC,U1064HC, 60IPC: U1160HC,U1176HC, 99HVAC: No Comm.
Could it be a faulty BCM? Where is it located?
Thanks for your help
William Mikesell
1000HC,U1064HC, 60IPC: U1160HC,U1176HC, 99HVAC: No Comm.Could it be a faulty BCM? Where is it located?
Thanks for your help
William Mikesell
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
No Comm with the BCM is going to be a serious issue. A couple of things come to mind...Very close to the BCM is flat connector with a bridge shorting type bar in it and tape over it. This is the serial interface connector. You need to insure its on fully. Next, is there any water in, on or around the BCM and passenger footwell area? If so, the BCM probably got water into it from plugged up udders on the HVAC system. Next, check the fuses in both compartments.
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No Comm with the BCM is going to be a serious issue. A couple of things come to mind...Very close to the BCM is flat connector with a bridge shorting type bar in it and tape over it. This is the serial interface connector. You need to insure its on fully. Next, is there any water in, on or around the BCM and passenger footwell area? If so, the BCM probably got water into it from plugged up udders on the HVAC system. Next, check the fuses in both compartments.
William Mikesell
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
Letting the car sit, then it will start is a clue here.
P1626 Theft Deterrent System Fuel Enable Circuit
U1064 Loss of Communications with BCM
U1000 Loss of Communication Undetermined
U1160 Loss of Communications with LDCM
U1176 Loss of Communications with RFA
Two thoughts off the top of the head as such, one: check your battery level with a meter and the ignition off by measuring across the battery. You need at least 12.5vdc there for the computers to work, therefore the age/status of your battery comes into question. two: In the door accordian tubes, there is a connector in which the serial data buss wire is present. That wire can become lose and cause issues so you might want to give the tube a shaking and see if anything changes.
Sorry, I don't have a picture of the serial buss star connector but Bill Curlee does. Hopefully he'll see this thread and offer his expertise to you. I'm still leaning towards that star connector as a possible cause though. Yes, the silver box is the BCM and this star connector is right there close by. You didn't find any water on or near the BCM or the carpet there? The no-start is being caused by the P1626HC which is shutting off the fuel pump and that is happening due to the no BCM comm.
P1626 Theft Deterrent System Fuel Enable Circuit
U1064 Loss of Communications with BCM
U1000 Loss of Communication Undetermined
U1160 Loss of Communications with LDCM
U1176 Loss of Communications with RFA
Two thoughts off the top of the head as such, one: check your battery level with a meter and the ignition off by measuring across the battery. You need at least 12.5vdc there for the computers to work, therefore the age/status of your battery comes into question. two: In the door accordian tubes, there is a connector in which the serial data buss wire is present. That wire can become lose and cause issues so you might want to give the tube a shaking and see if anything changes.
Sorry, I don't have a picture of the serial buss star connector but Bill Curlee does. Hopefully he'll see this thread and offer his expertise to you. I'm still leaning towards that star connector as a possible cause though. Yes, the silver box is the BCM and this star connector is right there close by. You didn't find any water on or near the BCM or the carpet there? The no-start is being caused by the P1626HC which is shutting off the fuel pump and that is happening due to the no BCM comm.
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Letting the car sit, then it will start is a clue here.
P1626 Theft Deterrent System Fuel Enable Circuit
U1064 Loss of Communications with BCM
U1000 Loss of Communication Undetermined
U1160 Loss of Communications with LDCM
U1176 Loss of Communications with RFA
Two thoughts off the top of the head as such, one: check your battery level with a meter and the ignition off by measuring across the battery. You need at least 12.5vdc there for the computers to work, therefore the age/status of your battery comes into question. two: In the door accordian tubes, there is a connector in which the serial data buss wire is present. That wire can become lose and cause issues so you might want to give the tube a shaking and see if anything changes.
Sorry, I don't have a picture of the serial buss star connector but Bill Curlee does. Hopefully he'll see this thread and offer his expertise to you. I'm still leaning towards that star connector as a possible cause though. Yes, the silver box is the BCM and this star connector is right there close by. You didn't find any water on or near the BCM or the carpet there? The no-start is being caused by the P1626HC which is shutting off the fuel pump and that is happening due to the no BCM comm.
P1626 Theft Deterrent System Fuel Enable Circuit
U1064 Loss of Communications with BCM
U1000 Loss of Communication Undetermined
U1160 Loss of Communications with LDCM
U1176 Loss of Communications with RFA
Two thoughts off the top of the head as such, one: check your battery level with a meter and the ignition off by measuring across the battery. You need at least 12.5vdc there for the computers to work, therefore the age/status of your battery comes into question. two: In the door accordian tubes, there is a connector in which the serial data buss wire is present. That wire can become lose and cause issues so you might want to give the tube a shaking and see if anything changes.
Sorry, I don't have a picture of the serial buss star connector but Bill Curlee does. Hopefully he'll see this thread and offer his expertise to you. I'm still leaning towards that star connector as a possible cause though. Yes, the silver box is the BCM and this star connector is right there close by. You didn't find any water on or near the BCM or the carpet there? The no-start is being caused by the P1626HC which is shutting off the fuel pump and that is happening due to the no BCM comm.
I did Bill Curlee's repair on the 2 ground circuits under the hood. Re checked all fuses good.
Thanks again
William
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Pull the codes again and report them under the sensor that they are associated with.
For example:
10 PCM
P1626HC
40 BCM
B2721
A0 LCDM
U1064
Here is a link on reading the codes:
Ok; Here are the codes, back up key used. 40 BCM No Comm, 58-SDM
(2) U1000HC, U1064HC 60-IPC (2) U1160HC, U1176HC 99HVAC No Comm, AO-LDCM U1064H, A1-RDCM U1064H, BO-RFA (3) U1096H,
U1000H, U1016H No interior lights, or Security message did display "Service Vehicle Soon" message
Thanks so very much, pretty frustrating for me.
William
http://www.c5forum.com/ayc/dtcdic.php
Pay attention to the procedure to follow once the system goes into MANUAL mode and step thropugh each sensor and each code for that sensor.
Also get your backup key out and use it when pulling the codes.
For example:
10 PCM
P1626HC
40 BCM
B2721
A0 LCDM
U1064
Here is a link on reading the codes:
Ok; Here are the codes, back up key used. 40 BCM No Comm, 58-SDM
(2) U1000HC, U1064HC 60-IPC (2) U1160HC, U1176HC 99HVAC No Comm, AO-LDCM U1064H, A1-RDCM U1064H, BO-RFA (3) U1096H,
U1000H, U1016H No interior lights, or Security message did display "Service Vehicle Soon" message
Thanks so very much, pretty frustrating for me.
William
http://www.c5forum.com/ayc/dtcdic.php
Pay attention to the procedure to follow once the system goes into MANUAL mode and step thropugh each sensor and each code for that sensor.
Also get your backup key out and use it when pulling the codes.
U1064H, A1-RDCM: U1064H, BO-RFA: u1096H,U1000H,U1016H. No interior light, security message but did display"Service Vehicle Soon"
Thanks so very much for kind help.
William
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
Did you ever check all of the fuses in both fuse boxes? The next step will be to start disconnecting various modules then run the codes again to see if the BCM starts talking. I would start with the SCM which is the seat control module under the driver's seat.
Last edited by dgrant3830; Jul 3, 2011 at 08:07 PM.
Thread Starter
Intermediate
Joined: Mar 2010
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Thanks
William
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Tech Contributor
Joined: Dec 2006
Posts: 10,962
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From: Van Buren Arkansas
Wounded Warrior Escort '11
I can't see the car starting up after 30 minutes if the BCM is bad. Not saying it can't happen but who knows. I think it would be prudent to send a PM to either/both Bill Curlee or Lucky131969 about this thread and ask for assistance. 8VETTE7 might be just as good too and be able to assist. About the only thing I can do is to point a possible direction.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
To the LEFT of the BCM,,, there are TWO thin connectors. They are the STAR Serial Buss connectors. The connector with the least number of wires is the serial buss for the Door modules and the seat module. The TOP of the connector is a shorting strip. Remove the top of the connector with the least numper of wires.
Once its removed,, CLEAR ALL THE DTCs and then see if the car will start. You will get door module and seat module NO COMMS (expected)
Post results!
BC
Once its removed,, CLEAR ALL THE DTCs and then see if the car will start. You will get door module and seat module NO COMMS (expected)
Post results!
BC
Thread Starter
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To the LEFT of the BCM,,, there are TWO thin connectors. They are the STAR Serial Buss connectors. The connector with the least number of wires is the serial buss for the Door modules and the seat module. The TOP of the connector is a shorting strip. Remove the top of the connector with the least numper of wires.
Once its removed,, CLEAR ALL THE DTCs and then see if the car will start. You will get door module and seat module NO COMMS (expected)
Post results!
BC
Once its removed,, CLEAR ALL THE DTCs and then see if the car will start. You will get door module and seat module NO COMMS (expected)
Post results!
BC
(2) B2284H, U1064H, A1DCM (2) B2285H, U 1064H.
Thanks so much for helping me.
William
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
If your serial buss isn't compromised,, you must be missing a voltage. Most common issue is a bad /dirty ignition switch. Follow this post and read the the voltages at the "Hot in Run & Start" supplied fuses and make sure that you have full battery voltage on those fuses:
-C5 ignition Switch repair - http://forums.corvetteforum.com/c5-t...ch-repair.html
-C5 ignition Switch repair - http://forums.corvetteforum.com/c5-t...ch-repair.html
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Ok Voltage #19=12.1, 18=12.1,17=12.1,22=12.1,16=12.1 13=12.1 inside #21=11.9 #22=11.9 # 19=12.0
Battery voltage 12.1 It has dropped over the last 5 hrs. at about 4;30 it was 12.5. Also every now and then the interior lights come on and the car will start normally. The last time that happened 2 days ago I thought the "problem resolved itself" but when I touched the BCM I heard a distinct "click" the lights went off, no start ever since? Could it be a bad BCM?
Thanks for you kind help.
William
Battery voltage 12.1 It has dropped over the last 5 hrs. at about 4;30 it was 12.5. Also every now and then the interior lights come on and the car will start normally. The last time that happened 2 days ago I thought the "problem resolved itself" but when I touched the BCM I heard a distinct "click" the lights went off, no start ever since? Could it be a bad BCM?
Thanks for you kind help.
William
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Disconnect the battery.. Pull the BCM (all three connectors) and inspect the BCM, Plugs and wires for damage. Make sure that all the connectors are fully connected and reconnect the battery and see what happens. Clear ALL the DTCs. Carefully move the wires and connectors and see if you get the same intermittent problems.
BC
BC
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OK as instructed. Codes: 40 BCM No Comm., 58 SDM (2) U 1000C, U1064HC, 60 IPC (2)
U1160HC, U1176HC 99HVAC NO Comm, AO LDCM U1064H A1RDCM U1064H. Carefully wiggled each wire of all 3 connectors & the star connectors No Change No Start. I had slow charged the battery overnite, new readings #19 13.1, 18 13.1,17,13.1,22 13.1, 16 13.1, # 21 12.5,22 12.5 19 12.5.
Thanks againfor your help it is VERY much appreciated.
William
U1160HC, U1176HC 99HVAC NO Comm, AO LDCM U1064H A1RDCM U1064H. Carefully wiggled each wire of all 3 connectors & the star connectors No Change No Start. I had slow charged the battery overnite, new readings #19 13.1, 18 13.1,17,13.1,22 13.1, 16 13.1, # 21 12.5,22 12.5 19 12.5.
Thanks againfor your help it is VERY much appreciated.
William
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OK as instructed. Codes: 40 BCM No Comm., 58 SDM (2) U 1000C, U1064HC, 60 IPC (2)
U1160HC, U1176HC 99HVAC NO Comm, AO LDCM U1064H A1RDCM U1064H. Carefully wiggled each wire of all 3 connectors & the star connectors No Change No Start. I had slow charged the battery overnite, new readings #19 13.1, 18 13.1,17,13.1,22 13.1, 16 13.1, # 21 12.5,22 12.5 19 12.5.
Thanks againfor your help it is VERY much appreciated.
William
U1160HC, U1176HC 99HVAC NO Comm, AO LDCM U1064H A1RDCM U1064H. Carefully wiggled each wire of all 3 connectors & the star connectors No Change No Start. I had slow charged the battery overnite, new readings #19 13.1, 18 13.1,17,13.1,22 13.1, 16 13.1, # 21 12.5,22 12.5 19 12.5.
Thanks againfor your help it is VERY much appreciated.
William
Thanks for your kindness.
William
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U 1000Hc, U1064HC, 60 IPC (2) U1160HC, U 1176HC, 99 HVAC No Comm, AO LDCMU 1064H,
A1 RDCM U1064H " Service Vehicle Soon" Please Help
Thanks
William
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Still no start, no interior lights. Battery voltage 12.5, fuses all good, wiggle test wires on BCM and star connectors no change, no evidence of water or corrosion. Todays codes: 40 BCM No Comm.,58-SDM (2)
U 1000Hc, U1064HC, 60 IPC (2) U1160HC, U 1176HC, 99 HVAC No Comm, AO LDCMU 1064H,
A1 RDCM U1064H " Service Vehicle Soon" Please Help
Thanks
William
U 1000Hc, U1064HC, 60 IPC (2) U1160HC, U 1176HC, 99 HVAC No Comm, AO LDCMU 1064H,
A1 RDCM U1064H " Service Vehicle Soon" Please Help
Thanks
William
Check the fuses FIRST! Use a METER and see if theres battery voltage on each fuse..
BC
Bill
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Bill: Thanks for all of you help. I replaced the BCM with a used one from a 2000. Completed the re-learn procedure, started ok. Deleted the existing code, ran diagnostics, " no codes". Everthing works normally except when you release the E brake the headlights come on, I will take it to the dealer for reprogamming. I would be happy to send you the old BCM if you would like to check it out. Again a heartfelt thanks.
William
William