I am looking to buy a 99 convertible. The owner told me the ABS light was on so i figured the EBCM has failed on the car. I have searched the threads and have only found links to how its impossible to find for pre 2001. So my question is what exactly no longer works when the EBCM fails in a corvette with the active suspension package and is it still worth buying if i can get it cheap enough. i am gonna hit him at 12k for a 6sp convertible with 86k miles

 

If you need to panic brake the tires can lock up and skid. ABS modulates the brake pressure to prevent this. Doesn't affect daily driving.

 

There are 30 different DTCs that can be causing EBTCM to have an issue. You need to use the DIC and read the DTCS to figure out what is wrong. Could be as simple as a loose connector, bad fuse, bad wheel speed sensor connector,, or as serious as a damaged EBTCM CPU.

If you don't post the DTCs you wont know what the car is complaining about!!

The EBTCM will report diagnostic self test when the IGNITION SWITCH is in RUN. If you turn OFF the ignition switch, those valuable diagnostic Trouble Codes (DTCs) can and will vanish.

Take the car for a drive, when you see the DIC Messages, PRESS RESET until they go away and then press OPTIONS and FUEL and read the DTCs

List those DTCs and we can better point you in the correct repair or purchase direction.

READING YOUR Engine Diagnostic Codes



The Diagnostic Display Mode is entered with the following procedure:

1) Turn on the ignition but don't start the engine. NOTE! You can read the DTCs with the engine running and or driving down the road but it can distract you. BE careful! Some DTCs clear themselves when you turn the ignition OFF!

2) Press the RESET button to turn off any warning messages. (i.e. door open, trunk open ect)
3) Press and hold OPTIONS
4) While holding OPTIONS, press FUEL four times within a 10-second period.


Initially, on-board diagnostics go into an Automatic Mode which shows diagnostic codes in a pre-set sequence: PCM - TCS - RTD - BCM - IPC - RADIO - HVAC - LDCM - RDCM - SCM - RFA. All codes will be displayed for each. ( i.e. PCM = 4 codes) If none are present in a given module, you will see No More Codes on the display.
There are two kinds of diagnostic codes, Current and History designated with a letter suffix, “C” or “H”. A current C code indicates a malfunction is present and active in the module displaying data. A history code indicates a problem existed sometime in the last 40 or 50 ignition cycles. When not accompanied by a current code of the same number, it's potential evidence of a previous problem, now resolved, that was not removed by clearing the codes.
More likely it's an indication of an intermittent malfunction.
Intermittent codes are the most challenging of the diagnostics. An intermittent code may have happened once, may have happened more than once but is inconsistent or may be happening on a regular basis but not at the time the codes are displayed. History codes can also be caused by a current malfunction in a system that is not operating at the time codes are displayed. An example is the rear window defogger which doesn't operate until the Body Control Module detects engine rpm. For history codes set by a module that does not operate with the key on and engine off, a special diagnostic tool called a Scan Tester is necessary to properly diagnose the malfunction.
Once the system has displayed all modules, it goes into the manual mode which allows selection of each module using combinations of Driver Information Center buttons. Manual mode can also be entered during the automatic sequence by pressing any button except English/Metric (E/M). Once the display shows Manual Diagnostics, select a module by pressing the OPTIONS button to go forward or the TRIP button to go back. Once a module is selected, a code is displayed, and if more than one are present; press GAGES to go forward or FUEL to go back.
To exit the diagnostic mode at any time, press E/M. If you want to erase codes in a given module, press and hold the RESET button To reset the codes once in manual mode, press and hold RESET until it displays NO CODES Press OPTIONS to go to the next module. Repeat the steps until you have reset the codes in all the computer modules.
NOTE!! Only reset the codes IF you want to - it is NOT necessary to do this. Clearing a code does not repair a problem. You are simply erasing the evidence of it in the module's memory. If you clear the code/s, and extinguish the Check Engine Light, your emissions status ready will NOT allow you to pass an emissions test until you have completed the required driving cycles.
Once you have the codes, the next question is: What to do with the information?
First, consult the factory service manual. Any serious C5 Do-It-Yourself owner should invest in the Corvette Service Manual of the appropriate model year. The Service Manual is really a requirement if you want to understand and work on your C5. You can GOOGLE the DTC and also find information on it.




Here is very good site that explains the DTCs:


http://www.corvette-web-central.com/C5DTCcode.html


http://www.obd-codes.com/trouble_cod...d-ii-codes.php



Make sure to include the H or C suffix!!

 

The ebcm controls much more than just abs. Traction control, active handling, and magnasteer are all off line. Some people do get along without it. If the ebcm has failed that is way too much money. Like Bill said you need the codes to identity the problem. Could be a simple fix, maybe not.

 

If, like me; you are concerned about critical replacement items, get on-board and vote at the following;

https://www.corvetteforum.com/forums...an-2015-a.html

Vote C5 aftermarket parts.




Dannyman