B0-rfa No Comm.
Thread Starter
Racer
Joined: Jan 2000
Posts: 422
Likes: 3
From: Palatine IL
B0-rfa No Comm.
I pulled the 2000 C5 out of storage over the weekend. Over the winter the battery did die so I wasn't surprised that I would have to reprogram my FOB and Tire Pressure. To my surprise, it wouldn't let me. You get to the training selection and neither will start the process when you hit reset. Displayed the codes and I have a B0-RFA NO COMM. Anyone experience this before?
I figured I'd look for loose connections and there appears to be a module located above the left rear insulator panel in the hatch area. The manual says to remove the one retainer but I can't figure out how to remove the panel. Any hints on that or anything else I might check?
I figured I'd look for loose connections and there appears to be a module located above the left rear insulator panel in the hatch area. The manual says to remove the one retainer but I can't figure out how to remove the panel. Any hints on that or anything else I might check?
Thread Starter
Racer
Joined: Jan 2000
Posts: 422
Likes: 3
From: Palatine IL
These are the codes I had before I did a reset on all of them:
SDM B1001 H
PCM P1571 H
LDCM B2284 H. B2262 H. U1064 H. U1096 H
RDCM B2285 H. U1064 H. U1096 H
SCM B0854 H
B0-RFA NO COMM.
I wanted to get to the receiver box to check connections above the left rear wheel but it appears the panel is glued in. Any tips on removing it?
SDM B1001 H
PCM P1571 H
LDCM B2284 H. B2262 H. U1064 H. U1096 H
RDCM B2285 H. U1064 H. U1096 H
SCM B0854 H
B0-RFA NO COMM.
I wanted to get to the receiver box to check connections above the left rear wheel but it appears the panel is glued in. Any tips on removing it?
Racer
Joined: Dec 2001
Posts: 452
Likes: 2
From: Lynnfield MA
Yuck! Just out of curiosity, did you look under the passenger
kickboard to see if you had any "guests" or water drippings
this winter?
Did the car start? All those comms errors sounds ominous...
Thread Starter
Racer
Joined: Jan 2000
Posts: 422
Likes: 3
From: Palatine IL
I get the Service Engine Soon and the Check Tire Pressure messages but the car runs as usual. I was going to dig into the fuse panel on the passenger side but not sure which one's to check. I'll try to reseat connections while I'm there. Hope it's not something like a bad ground. Those can be hell to trace. I still can't believe the panel covering the RFA receiver is glued in. Who the heck thought of that one?
Racer
Joined: Dec 2001
Posts: 452
Likes: 2
From: Lynnfield MA
I get the Service Engine Soon and the Check Tire Pressure messages but the car runs as usual. I was going to dig into the fuse panel on the passenger side but not sure which one's to check. I'll try to reseat connections while I'm there. Hope it's not something like a bad ground. Those can be hell to trace. I still can't believe the panel covering the RFA receiver is glued in. Who the heck thought of that one?
All those "U" codes indicate that two of the computers can't talk to
each other. Each of the computers is a "peer" on the network, so
this sounds like more than a ground fault. It almost sounds like the
bus has been disconnected somewhere. Luckily, all the big-guys that
run the car seem to be happy, but the door computers are out to lunch.
It sure does look like it's a fuse or some other large disturbance in
the force.
I don't think it has anything to do with the RFA receiver.
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Thread Starter
Racer
Joined: Jan 2000
Posts: 422
Likes: 3
From: Palatine IL
After making sure the cables around the brain box next to the fuse panel were secure, the problem still persisted. I disconnected the battery for a few minutes and after reconnecting I was able to train the FOB and Tire Pressure! I'm good to go. Now if I could get my CD player to play CDs...
Racer
Joined: Dec 2001
Posts: 452
Likes: 2
From: Lynnfield MA
Stupid computers.
Glad to hear you're up and running!
Head unit bad? Check EBay - there's a ton of stock GM radios listed.
Thread Starter
Racer
Joined: Jan 2000
Posts: 422
Likes: 3
From: Palatine IL
Yeah. I think we're going to need CTL-ALT-DEL keys on new cars these days. I do check eBay and the for-sale section for the head unit. Got the dimming HVAC control as well. Already touched it up with a soldering iron but it's still not 100%. Thanks again.
Pro
Joined: Sep 1999
Posts: 706
Likes: 38
From: Charlottesville VA
I'm getting the same thing. B0-RFA NO COMM, and the computer won't let me train the FOB nor pressure sensors when I press reset.
I too have a 2000. I tried disconnecting the battery several times for a couple of minutes to no avail. The battery is fresh and the terminals clean. I also located the receiver and disconnected it and pulled it out. It looked fine. I then reconnected it and re-installed it. Same error.
Also, fuse #27 in the passenger footwell checks ok. I'm stumped...
I too have a 2000. I tried disconnecting the battery several times for a couple of minutes to no avail. The battery is fresh and the terminals clean. I also located the receiver and disconnected it and pulled it out. It looked fine. I then reconnected it and re-installed it. Same error.
Also, fuse #27 in the passenger footwell checks ok. I'm stumped...
Racer
Joined: Dec 2001
Posts: 452
Likes: 2
From: Lynnfield MA
I'm getting the same thing. B0-RFA NO COMM, and the computer won't let me train the FOB nor pressure sensors when I press reset.
I too have a 2000. I tried disconnecting the battery several times for a couple of minutes to no avail. The battery is fresh and the terminals clean. I also located the receiver and disconnected it and pulled it out. It looked fine. I then reconnected it and re-installed it. Same error.
Also, fuse #27 in the passenger footwell checks ok. I'm stumped...
I too have a 2000. I tried disconnecting the battery several times for a couple of minutes to no avail. The battery is fresh and the terminals clean. I also located the receiver and disconnected it and pulled it out. It looked fine. I then reconnected it and re-installed it. Same error.
Also, fuse #27 in the passenger footwell checks ok. I'm stumped...
Next step is to check if voltage is actually reaching that receiver,
and if the ground lead shows low resistance to ground.
If that checks out, then I'd say you're in the market for a new
receiver. If not, then some more quality time with the wiring
harness is the order of the day.
Le Mans Master
Joined: Jun 2002
Posts: 8,352
Likes: 103
From: In the pit, trying to love someone.
Pardon my ignorance but why is there so much computer crap on this car?! My 99 SS has the same engine my C5 does, or had, and it doesnt have any of this other computer bs!
Racer
Joined: Dec 2001
Posts: 452
Likes: 2
From: Lynnfield MA
Digital computers are the easiest way to implement all the toys.
Le Mans Master
Joined: Jun 2002
Posts: 8,352
Likes: 103
From: In the pit, trying to love someone.
Like what? What is it all there for? My car is in a million pieces right now and I don't see anything that won't work without that crap. I don't have active handling or any of that crap by the way.
Racer
Joined: Dec 2001
Posts: 452
Likes: 2
From: Lynnfield MA
One man's trash is another man's treasure.
Active handling is the classic case. I thought it was crap at first,
too, until it saved my bacon on a coolant slick out on the racetrack.
Another case: the coupes have antennas in the glass, front and rear.
Normally, having two antennas creates destructive interferance,
which is why most antennas-in-the-glass cars just have one.
But with one, you get lousy reception. With two, you have to do
some digital signal processing to properly combine the two signals,
and then you get *better* signal quality than with just one antenna,
but you need a DSP, i.e. a computer.
I do think the computers in the doors are excessive, but by making
them large-format and hanging them in the door, it's probably
cheaper than trying to minaturize them and stick one under the
dash somewhere.
And just for the record, there are plenty of cars running around
with LS1s out there with all the "crap" flashed out of them.
But guess what? They're not Corvettes.
Le Mans Master
Joined: Jun 2002
Posts: 8,352
Likes: 103
From: In the pit, trying to love someone.
One man's trash is another man's treasure.
Active handling is the classic case. I thought it was crap at first,
too, until it saved my bacon on a coolant slick out on the racetrack.
Another case: the coupes have antennas in the glass, front and rear.
Normally, having two antennas creates destructive interferance,
which is why most antennas-in-the-glass cars just have one.
But with one, you get lousy reception. With two, you have to do
some digital signal processing to properly combine the two signals,
and then you get *better* signal quality than with just one antenna,
but you need a DSP, i.e. a computer.
I do think the computers in the doors are excessive, but by making
them large-format and hanging them in the door, it's probably
cheaper than trying to minaturize them and stick one under the
dash somewhere.
And just for the record, there are plenty of cars running around
with LS1s out there with all the "crap" flashed out of them.
But guess what? They're not Corvettes.
Active handling is the classic case. I thought it was crap at first,
too, until it saved my bacon on a coolant slick out on the racetrack.
Another case: the coupes have antennas in the glass, front and rear.
Normally, having two antennas creates destructive interferance,
which is why most antennas-in-the-glass cars just have one.
But with one, you get lousy reception. With two, you have to do
some digital signal processing to properly combine the two signals,
and then you get *better* signal quality than with just one antenna,
but you need a DSP, i.e. a computer.
I do think the computers in the doors are excessive, but by making
them large-format and hanging them in the door, it's probably
cheaper than trying to minaturize them and stick one under the
dash somewhere.
And just for the record, there are plenty of cars running around
with LS1s out there with all the "crap" flashed out of them.
But guess what? They're not Corvettes.