Help!!!
Thread Starter
3rd Gear
Joined: Dec 2022
Posts: 3
Likes: 1
Help!!!
Hello everyone I am in need of some help please.
00 C5
New BCM from Cardone
New Coil packs
New injectors
What started as a TDR issue has turned into a nightmare.
I have no comm to BCM and the following codes. Car runs good after about 5 minutes into start up but P0300 comes in.
SDM U1000 C H
IPC U1160
RFA U1000
All three are current and history.
Rewired the accordion wires both sides, cleaned all grounds. Battery is charged. I do lose PCM comms on occasion and it comes in on its own. Any ideas???
00 C5
New BCM from Cardone
New Coil packs
New injectors
What started as a TDR issue has turned into a nightmare.
I have no comm to BCM and the following codes. Car runs good after about 5 minutes into start up but P0300 comes in.
SDM U1000 C H
IPC U1160
RFA U1000
All three are current and history.
Rewired the accordion wires both sides, cleaned all grounds. Battery is charged. I do lose PCM comms on occasion and it comes in on its own. Any ideas???
.
Joined: Apr 2013
Posts: 5,025
Likes: 1,151
From: Oregon
St. Jude Donor '14-'15-'16-'17-'18-'19-'20-'21-'22-'23
Did you do this to get the pcm talking to the bcm?
BCM/PCM RELEARN PROCEDURE
You will need to conduct the PCM/BCM relearn process. This matches their handshake ID's and allows them to talk to each other.
Do this before you worry about VATS issues:
1. Turn on the key for 11 minutes.
2 Turn off the key for 30 seconds.
3. Repeat 1&2 two more times.
4. Turn on the key for 30 seconds.
The car should start and run with the new BCM
BCM/PCM RELEARN PROCEDURE
You will need to conduct the PCM/BCM relearn process. This matches their handshake ID's and allows them to talk to each other.
Do this before you worry about VATS issues:
1. Turn on the key for 11 minutes.
2 Turn off the key for 30 seconds.
3. Repeat 1&2 two more times.
4. Turn on the key for 30 seconds.
The car should start and run with the new BCM
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,498
Likes: 3,999
From: Cape Coral, Florida
Hello everyone I am in need of some help please.
00 C5
New BCM from Cardone
New Coil packs
New injectors
What started as a TDR issue has turned into a nightmare.
I have no comm to BCM and the following codes. Car runs good after about 5 minutes into start up but P0300 comes in.
SDM U1000 C H
IPC U1160
RFA U1000
All three are current and history.
Rewired the accordion wires both sides, cleaned all grounds. Battery is charged. I do lose PCM comms on occasion and it comes in on its own. Any ideas???
00 C5
New BCM from Cardone
New Coil packs
New injectors
What started as a TDR issue has turned into a nightmare.
I have no comm to BCM and the following codes. Car runs good after about 5 minutes into start up but P0300 comes in.
SDM U1000 C H
IPC U1160
RFA U1000
All three are current and history.
Rewired the accordion wires both sides, cleaned all grounds. Battery is charged. I do lose PCM comms on occasion and it comes in on its own. Any ideas???
Last edited by C5 Diag; Feb 14, 2023 at 05:48 PM.
Thread Starter
3rd Gear
Joined: Dec 2022
Posts: 3
Likes: 1
Is a shop handling this diagnosis or are you ??…why were the coil packs and injectors changed ??…if you have a P0300 I would suspect your new injectors and coil packs…if you have a BCM with a “no comm” you check the BCM’s powers and grounds first !!…why was the DDM and PDM connector wiring redone ??…what was your initial concern with the car ???
It is not at a shop. Husband and I are...
New packs and injectors because we wanted them, and they were the originals with over 100k
All grounds cleaned and checked through the entire vehicle
Initial issue was it was in vats mode would not start, called a mechanic whom cut wires and attempted to install a vats bypass only to cause more issues.
Please elaborate on the DDM and PDM question, did I state this on my thread?
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,498
Likes: 3,999
From: Cape Coral, Florida
It is not at a shop. Husband and I are...
New packs and injectors because we wanted them, and they were the originals with over 100k
All grounds cleaned and checked through the entire vehicle
Initial issue was it was in vats mode would not start, called a mechanic whom cut wires and attempted to install a vats bypass only to cause more issues.
Please elaborate on the DDM and PDM question, did I state this on my thread?
New packs and injectors because we wanted them, and they were the originals with over 100k
All grounds cleaned and checked through the entire vehicle
Initial issue was it was in vats mode would not start, called a mechanic whom cut wires and attempted to install a vats bypass only to cause more issues.
Please elaborate on the DDM and PDM question, did I state this on my thread?
Last edited by C5 Diag; Feb 16, 2023 at 04:56 AM.
Thread Starter
3rd Gear
Joined: Dec 2022
Posts: 3
Likes: 1
The “accordion wires” you rewired are the wiring for driver (DDM) and passenger door module (PDM)…and as previously stated for the BCM “no comm” check power and grounds…what does your mechanic think is wrong ??…I’d find another mechanic…things seem to be getting progressively wrong…don’t know what your initial concern was with the car so it may be difficult to offer advise !!
mechanic was fired. Live in a small town and many don’t work on these. It was on theft mode. Bays bypass module was to be installed. He fried my bcm. Hence the new one. And there was issues with the wires and we found several wires needed repair.
The car has gone from a no start to starting. Bcm relearn hasn’t been completed due to the serial data issues. Low voltage.
