What next after finding codes?
Thread Starter
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Joined: Dec 2013
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From: west coast of Canada
What next after finding codes?
I'm looking at buying a 2002 vert from which I get the following codes: 40- BCM shows 5 codes, AO-LDCM shows 3 codes and A1-RDCM shows 5 codes. Which tells me there is a possible problem with the: body control module, left door control module and right door control module. I like to do my own work, so hopefully I'm only looking at buying parts.
What is my next step?
Thanks in advance.
Mark
What is my next step?
Thanks in advance.
Mark
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,319
Likes: 3,927
From: Cape Coral, Florida
First off you NEVER change a part because of a code…first determine what the code is and if it’s a current or history code…you then need to determine what sets that code and go from there !!
Thread Starter
Pro
Joined: Dec 2013
Posts: 627
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From: west coast of Canada
Thanks for your help guys.
How do I determine what the code is?
How do I determine whether it is a current or history code?
How do I determine what set the code.
Can I get the preceding info from the car's computer?
There is no check engine light.
Is the next step getting a diagnostic instrument?
How important are the door modules? The door locks and power windows seem to work fine. The trunk pops up and the fuel door opens with no problem.
The car starts with no issues.
My problem is that I really want to buy this car but not until I find out if the codes are significant.
Cheers,
Mark
How do I determine what the code is?
How do I determine whether it is a current or history code?
How do I determine what set the code.
Can I get the preceding info from the car's computer?
There is no check engine light.
Is the next step getting a diagnostic instrument?
How important are the door modules? The door locks and power windows seem to work fine. The trunk pops up and the fuel door opens with no problem.
The car starts with no issues.
My problem is that I really want to buy this car but not until I find out if the codes are significant.
Cheers,
Mark
Thread Starter
Pro
Joined: Dec 2013
Posts: 627
Likes: 181
From: west coast of Canada
Please ignore most of my last post. Just found out how to determine what the code is and whether it is history or current.
I have yet to find out what set the code.
cheers,
Mark
I have yet to find out what set the code.
cheers,
Mark
Race Director
Joined: Oct 2004
Posts: 12,795
Likes: 4,614
Thanks for your help guys.
How do I determine what the code is?
How do I determine whether it is a current or history code?
How do I determine what set the code.
Can I get the preceding info from the car's computer?
There is no check engine light.
Is the next step getting a diagnostic instrument?
How important are the door modules? The door locks and power windows seem to work fine. The trunk pops up and the fuel door opens with no problem.
The car starts with no issues.
My problem is that I really want to buy this car but not until I find out if the codes are significant.
Cheers,
Mark
How do I determine what the code is?
How do I determine whether it is a current or history code?
How do I determine what set the code.
Can I get the preceding info from the car's computer?
There is no check engine light.
Is the next step getting a diagnostic instrument?
How important are the door modules? The door locks and power windows seem to work fine. The trunk pops up and the fuel door opens with no problem.
The car starts with no issues.
My problem is that I really want to buy this car but not until I find out if the codes are significant.
Cheers,
Mark
Last edited by grinder11; Aug 20, 2021 at 06:50 PM.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,319
Likes: 3,927
From: Cape Coral, Florida
Last edited by C5 Diag; Aug 20, 2021 at 07:04 PM.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,319
Likes: 3,927
From: Cape Coral, Florida
And another video !!…by the way if a shop has a scope they can do a “relative compression test “ which takes 5 minutes to do vs. a few hours removing the plugs and doing one with a gauge !!
Last edited by C5 Diag; Aug 20, 2021 at 06:57 PM.
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Joined: Dec 2013
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From: west coast of Canada
Thanks for the input guys. I just got back from checking the car again but more thoroughly this time. Didn't know that once you had found a code, you had to push gages to find out the code number. I found that all the codes are history. Problem with codes is solved.
Thanks again for the input.
Cheers,
Mark
Thanks again for the input.
Cheers,
Mark
Thread Starter
Pro
Joined: Dec 2013
Posts: 627
Likes: 181
From: west coast of Canada
I tried to erase the codes by tapping the "reset" button, it did not work. I'll do some further checking on another approach. The dealer let me take the Vette out a couple of times, for a total of about 1 hour with some highway driving. Runs beautifully. If all goes well I'll be buying it on Monday.. Been looking for a Vette like this all over the US and Canada for the best part of the year (Covid19 didn't help), then this car shows up a 5 minute drive from my house. Go figure.
Cheers,
Mark
Cheers,
Mark
Tech Contributor
Joined: Oct 1999
Posts: 40,995
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From: Charlotte, NC (formerly Endicott, NY)
Do the codes start with U or some other character such as P, B or C? U codes generally mean nothing unless there are a lot of them. If there are a lot of them you could have a battery issue or battery connection issue. Since you mentioned door codes there are several door codes that relate to battery voltage which point to checking out the battery and it's connections. Remember Corvettes have plastic bodies so clean and tight ground points and junctions become very important. As mentioned before a code doesn't mean a specific part needs to be replaced it only tells you where to look for the problem. There are diagnostic procedures for each code that help you find the problem.
Bill
Bill
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Pro
Joined: Dec 2013
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From: west coast of Canada
Thanks Bill.
Both codes begin with a "B". I was thinking that checking and cleaning the grounds should be the first thing to do for my new Vette, now you've given me a good reason to get at it right away. I've got a couple of overviews of the locations of the grounds for a C5 from a Bill Curlee post some time ago so I should be able to locate most if not all of them. I'll buying a manual as soon as possible.
Before starting on the grounds, should I disconnect both battery terminals?
What should I use to clean the grounds?
After cleaning the grounds, should I coat the grounds with regular grease or dielectric or something else?
Cheers,
Mark
Both codes begin with a "B". I was thinking that checking and cleaning the grounds should be the first thing to do for my new Vette, now you've given me a good reason to get at it right away. I've got a couple of overviews of the locations of the grounds for a C5 from a Bill Curlee post some time ago so I should be able to locate most if not all of them. I'll buying a manual as soon as possible.
Before starting on the grounds, should I disconnect both battery terminals?
What should I use to clean the grounds?
After cleaning the grounds, should I coat the grounds with regular grease or dielectric or something else?
Cheers,
Mark
Thread Starter
Pro
Joined: Dec 2013
Posts: 627
Likes: 181
From: west coast of Canada
Thanks for the input. Time for me to do a Mea Culpa, the codes didn't erase because I didn't read the directions thoroughly. The directions say "push and hold the reset button", I pushed the reset button but did not hold it. Went back to the dealer's yesterday and did it again properly and presto, the codes have vaporized. I've checked for codes after driving the Vette and there are none. Did a battery drain test and it came out to 0.02 amps which from what I've read is where it is supposed to be. Today, I laid down my money and am now the happy owner of a 2002 Corvette.
Cheers,
Mark
Cheers,
Mark
