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  1. #1
    Member
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    Corvette(s)
    '00 Torch Red Cpe, 6spd, '90 Red/Saddle ZR-1 #279

    Default SOS!!! Serious electrical problems on my 2000???

    Help!!!

    I was out cruising to a client's site from my office today in my 2000 coupe when all heck broke loose. I started getting error messages in the DIC and the Check Engine and other lights came on. I pulled over as soon as I could and started copying down DTCs. With the number of codes (gotta be 40 or so) and the percentage of them that start with "U" (most), I'm guessing it has to be something electrical or computer-related.

    The right-side door is completely unresponsive-- the window won't budge, the door lock switch won't work, the mirror doesn't move. The left door is doing some of the same, but not all the time. I was able to roll the right window up all the way and drive for a few hundred feet without errors to a gas station after clearing all the DTCs. One other thing I noticed is that I had started to roll up my windows (had them down to aid the A/C in getting rid of the hot air built up) when the right one stopped on its own about an inch from the top, and then I got all of the errors. Some of the error messages in the DIC are:

    CHECK TIRE PRESSURE
    SERV. TIRE MON. SYS
    SHOCKS INOPERATIVE
    REDUCED ENGINE POWER
    SERVICE VEHICLE SOON
    SERVICE ACTIVE HANDLING
    LOW FUEL


    Here is the list of DTCs:

    PCM
    P1626 Theft Deterrent System Fuel Enable Circuit

    TCS
    U1016 Loss of Communications with PCM
    U1301 Class 2 Circuit Shorted to Battery

    RTD
    U1016 Loss of Communications with PCM

    BCM
    B2583 LF Turn Signal Monitor Circuit (Short to Voltage)
    U1255 Serial Data Line Malfunction
    U1016 Loss of Communications with PCM
    U1096 Loss of Communications with IPC

    SDM
    U1301 Class 2 Circuit Shorted to Battery
    U1000 Loss of Communication Undetermined
    U1064 Loss of Communications with BCM

    IPC
    U1255 Serial Data Line Malfunction
    U1016 Loss of Communications with PCM
    U1040 Loss of Communications with TCS
    U1056 Loss of Communications with RTD
    U1064 Loss of Communications with BCM
    U1176 Loss of Communications with RFA
    U1088
    U1160 Loss of Communications with LDCM

    Radio
    U1064 Loss of Communications with BCM
    U1016 Loss of Communications with PCM
    U1096 Loss of Communications with IPC

    HVAC
    U1064 Loss of Communications with BCM
    U1096 Loss of Communications with IPC
    U1160 Loss of Communications with LDCM
    U1255 Serial Data Line Malfunction

    LDCM
    B2284 Battery #2 Fault
    U1255 Serial Data Line Malfunction
    U1064 Loss of Communications with BCM
    U1016 Loss of Communications with PCM
    U1096 Loss of Communications with IPC

    RDCM
    No Comm.

    SCM
    B2187 Seat Rear Down Switch Shorted to GND
    U1300 Class 2 Circuit Shorted to Ground
    U1255 Serial Data Line Malfunction
    U1160 Loss of Communications with LDCM
    U1016 Loss of Communications with PCM

    RFA
    U1255 Serial Data Line Malfunction
    U1016 Loss of Communication with PCM
    U1064 Loss of Communication with BCM
    U1096 Loss of Communication with IPC

    Some details about the car: It's a 6spd coupe with most of the available options: Active Handling, Selective Real-Time Damping, HUD, memory package. It just turned 70000 miles (and apparently decided to pout rather than celebrate!). I washed it on Saturday, but didn't get any excessive water under the hood or inside, and was able to drive it with no trouble Saturday night. Since I got it nearly a year ago, the seat movement with memory settings has been dodgy-- I usually have to manually scoot up the last little bit (I believe that's where the SCM B2187 comes from).

    Does anyone know where I should start here? c4c5, seen this one before? I'm going to start looking through my service manuals, but if anybody has any thoughts or experiences with this, I'd be most grateful if you'd share.

    Thanks,
    Fred

  2. #2
    Technical Advisor c4c5specialist's Avatar
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    Corvette(s)
    Nope, but someday.

    Default

    HI there,
    You have 2 clues that are very important here.
    First, RDCM, NO COMM. This tells us that the door control module is not talking at all.
    Second, the U1301 in SDM and TCS tells us that for some reason, there is more voltage on the communications line then there should be.
    First suggestion, remove the 3 connectors from the passenger side door control module. You will NOT be able to use the power feature on the door, BUT, your problems may go away and NOT come back until you connect the door module again.
    Next, clear all your codes, and let us know how you make out.
    I am suspecting the door control module, but your test will help confirm this.
    Allthebest, c4c5
    GM World Class Certified Technician.
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  3. #3
    Member
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    Jul 2004
    Location
    Charlton, New York
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    93
    Corvette(s)
    2001 Pewter coupe

    Default question for fhturner

    I'm sorry to hear about you problems with your '00. I hope the responses that you get will help.

    I am a new owner of an '01 coupe (my second 'vette) and any time I hear of these types of problems I get the jitters. I am not a wrench head (just a devoted 'vette lover and if I had that kind of problem, I wouldn't know what to do.

    My question is, how did you clear the DTC's??? Also, did this probelm effect the drivability of the car?

  4. #4
    SLICKMAN
    Guest

    Default

    I'm not sure about all the codes but, based on my past exposure to these types of problems. I would check your battery and make sure its not leaking. Most of the battery's leak after some time. Mine did and it was screwing up everything!! I had to replace the following because of it: Battery (of course), Alt, all the battery cables including the cables going to the starter and removing the PCM to perform MAJOR cleaning..

    Just my two cents..

  5. #5
    Member
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    Birmingham, AL
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    Corvette(s)
    '00 Torch Red Cpe, 6spd, '90 Red/Saddle ZR-1 #279

    Default

    Quote Originally Posted by c4c5specialist
    First suggestion, remove the 3 connectors from the passenger side door control module. You will NOT be able to use the power feature on the door, BUT, your problems may go away and NOT come back until you connect the door module again.
    Thanks for the replies, guys!

    c4c5, I suspect the RDCM as well, because of the "NO COMM" error, as well as the fact that I can almost make the problem come back at will by trying to lower the passenger side window. That said, I've only had the problem come back twice since the initial post. It is definitely just electrical/computer-related, as I ran my last 2 autocross "fun runs" with the darned thing "dinging" at me, yet still had my best 2 times of the day.

    Also, a buddy of mine with a '99 is having the exact same problem, and you can open the passenger door to make the "NO COMM" error go away, but close it, and no more comm. So, seems to be a short or other electrical problem in the RDCM causing the whole system to freak out.

    I will unhook the RDCM and see what happens. Unfortunately (for testing), the problem is currently intermittent. I'll see if I can goad it into flaring up by playing with the window switch. c4c5, can you give me any tips on how to disconnect the RDCM, or point me to the right place in my service manuals?

    Thanks!
    Fred

  6. #6
    T's 99
    Guest

    Default

    Hey Fred, just tug on the darm wires, who knows it may work !
    Quote Originally Posted by fhturner
    Thanks for the replies, guys!

    c4c5, I suspect the RDCM as well, because of the "NO COMM" error, as well as the fact that I can almost make the problem come back at will by trying to lower the passenger side window. That said, I've only had the problem come back twice since the initial post. It is definitely just electrical/computer-related, as I ran my last 2 autocross "fun runs" with the darned thing "dinging" at me, yet still had my best 2 times of the day.

    Also, a buddy of mine with a '99 is having the exact same problem, and you can open the passenger door to make the "NO COMM" error go away, but close it, and no more comm. So, seems to be a short or other electrical problem in the RDCM causing the whole system to freak out.

    I will unhook the RDCM and see what happens. Unfortunately (for testing), the problem is currently intermittent. I'll see if I can goad it into flaring up by playing with the window switch. c4c5, can you give me any tips on how to disconnect the RDCM, or point me to the right place in my service manuals?

    Thanks!
    Fred

  7. #7
    Member
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    Corvette(s)
    1999 MagRed Coupe

    Default

    Had a similar problem, the wiring harness inside the passanger door came loose and was snagged by the window when it came down I traced the loose wires to the connector at the passenger door

  8. #8
    T's 99
    Guest

    Default

    where is the connector, in the passenger door itself ?

  9. #9
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    Corvette(s)
    1999 MagRed Coupe

    Default

    Open the door you will see a black flexable piece of rubber, the connector is inside, it just pulls away from each side You may have to gently pull the wiring to get to it

  10. #10
    T's 99
    Guest

    Default

    Thanks, rubber pulled away from door side with little effort, can not find connector inside rubber. By pulling on wires I am now making a good connection,door lights are now working, but for how long.

    Will try again tomorrow

  11. #11
    Member
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    Corvette(s)
    1978, 2001, 2001, 2003

    Default

    Fred, did you get your problem fixed? I have experience a LDCM communication problem that has caused the instrument panel to light up like yours.

  12. #12
    1askiker
    Guest

    Default my 2 cents

    i just had the same problem i disconected my battery + cable it was loose maby where my problem started ?when i did that my lights and lock & unllock slarted working i tuged on wires on passanger door all is well once again

  13. #13
    Moderator Toms007's Avatar
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    Corvette(s)
    2007 Atomic Orange Coupe

    Default

    jrhott...you do realize that this thread is over 5 years old don't you?

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