P0690- No Crank/No Start

[Mixer99]

Hey all! First post! I have a 2005 GT Coupe that has had a plethora of issues since I got it from CoPart, Here is what I have done so far, and what the current situation is:

-Tail lights, some front lights, turn signals worked sporadically
-Replaced Smart Junction Box- All electrical gremlins FIXED!
-However, Car immediately got a no crank/no start situation
-Had a locksmith come out, and the car will not store keys
-All keys forgotten
-PATs light flashes like crazy
-Autel will let you program keys, but they will not store...always says ZERO keys stored

Read DTC codes
-P0690- PCM Voltage detected high
-B1213- PATS Anti theft numbers of keys is below minimum
-B1681- PATS transceiver module not received
-B2103 PATS transceiver fault

Next steps taken:
-Replaced PCM with a programmed PCM from a reputable online vendor (My VIN stored)
-Replaced all fuses and relays under hood...checking all PCM-related fuses carefully
-Cleared all codes, tried to marry keys...NADA...all the same, all the same codes came back instantly

I am really at a loss now. I have a 3000 lb paperweight that I've been trying to fix for a month now. This all started when I disconnected and replaced the Smart Junction Box. And yep, I even put in the old, broken SJB to see if that would fix...and yep, old PCM as well. Nothing, nada, all the same codes.

Humbly asking, nay begging for any help or insight! Also, any Nashville-area folks, I would welcome you with open arms if you would like to come by

 

[86GT351]

Hey all! First post! I have a 2005 GT Coupe that has had a plethora of issues since I got it from CoPart, Here is what I have done so far, and what the current situation is:

-Tail lights, some front lights, turn signals worked sporadically
-Replaced Smart Junction Box- All electrical gremlins FIXED!
-However, Car immediately got a no crank/no start situation
-Had a locksmith come out, and the car will not store keys
-All keys forgotten
-PATs light flashes like crazy
-Autel will let you program keys, but they will not store...always says ZERO keys stored

Read DTC codes
-P0690- PCM Voltage detected high
-B1213- PATS Anti theft numbers of keys is below minimum
-B1681- PATS transceiver module not received
-B2103 PATS transceiver fault

Next steps taken:
-Replaced PCM with a programmed PCM from a reputable online vendor (My VIN stored)
-Replaced all fuses and relays under hood...checking all PCM-related fuses carefully
-Cleared all codes, tried to marry keys...NADA...all the same, all the same codes came back instantly

I am really at a loss now. I have a 3000 lb paperweight that I've been trying to fix for a month now. This all started when I disconnected and replaced the Smart Junction Box. And yep, I even put in the old, broken SJB to see if that would fix...and yep, old PCM as well. Nothing, nada, all the same codes.

Humbly asking, nay begging for any help or insight! Also, any Nashville-area folks, I would welcome you with open arms if you would like to come by

Programming prior to install does not really work. The PCM needs to be programmed to the specific vehicle.

 

[Mixer99]

Update- I have sent the car to a local, car electrical specialist who does PCM and entire car electronics as their main focus. Will see how simple or complicated the fix is.

 

[Mixer99]

Final update- electrical specialist said it had been in water...so, I brought it home....cleaned all electrical harnesses on the Smart Junction box with vinegar, then baking soda....THEN cleaned each pin individually with DeOxIt....let it all dry, put it back together, and was able to program keys.....and bam, it runs great now!!!

 

[86GT351]

Final update- electrical specialist said it had been in water...so, I brought it home....cleaned all electrical harnesses on the Smart Junction box with vinegar, then baking soda....THEN cleaned each pin individually with DeOxIt....let it all dry, put it back together, and was able to program keys.....and bam, it runs great now!!!

That's good news. Look into replacing your SJB though. They are not repairable and once water gets in, it is done.

 

[Mixer99]

Oh, I did! That is what started this whole thing! i hope between replacing SJB, cleaning all connectors thoroughly, and cleaning PCM connectors, too...I should be good for a while!

 

[86GT351]

Oh, I did! That is what started this whole thing! i hope between replacing SJB, cleaning all connectors thoroughly, and cleaning PCM connectors, too...I should be good for a while!

Once replaced, was it programmed to the vehicle?

 

[Mixer99]

yessir, it was! And luckily, I was able to send back the replacement PCM and put the original back in as well...saving those $$$$.

 

[pass1over]

I've read about multiple people using a different SJB without needing any programming.

Did they just get lucky?

 

[bambam 06]

Final update- electrical specialist said it had been in water...so, I brought it home....cleaned all electrical harnesses on the Smart Junction box with vinegar, then baking soda....THEN cleaned each pin individually with DeOxIt....let it all dry, put it back together, and was able to program keys.....and bam, it runs great now!!!

Buying a car from Copart, is taking a big chance! Your car probably was in a flood, Copart does not tells you what is wrong with the car. Not good.

 

[86GT351]

Buying a car from Copart, is taking a big chance! Your car probably was in a flood, Copart does not tells you what is wrong with the car. Not good.

I believe by law they are not liable to disclose info on the vehicle.

 

[bambam 06]

I believe by law they are not liable to disclose info on the vehicle.

According to Copart's website, you should not rely on a condition report to decide how much to bid on a vehicle. You should research, inspect, and confirm the vehicle before buying it

 

[86GT351]

According to Copart's website, you should not rely on a condition report to decide how much to bid on a vehicle. You should research, inspect, and confirm the vehicle before buying it

That's at any auction. And you can't always go by Car Fax because not everything is reported.

 

[Hotcorner]

I've read about multiple people using a different SJB without needing any programming.

Did they just get lucky?

Thoughts?

 

[Hotcorner]

Thoughts?

Beuller? I am not clear about a plug and play swap if the donor SJB came from same car, e.g., same year GT with a manual transmission. If it has to be programmed has anyone tried a BCM cloning service instead of a dealer? I’m thinking dealer might balk at installing and programming a used one.

 

[86GT351]

Beuller? I am not clear about a plug and play swap if the donor SJB came from same car, e.g., same year GT with a manual transmission. If it has to be programmed has anyone tried a BCM cloning service instead of a dealer? I’m thinking dealer might balk at installing and programming a used one.

The cloning service might work as long as they have the appropriate equipment. The reason it is not plug and play is it comes from a different VIN. That's what the modules see when they talk to each other. Wrong vin creates confusion.

 

[Hotcorner]

Will a dealerships transfer the vin to a used SJB?