Hi all. my 1997 c5 vette in the past two days has flashed the "service traction control, abs off" message followed by the two orange lights on the dash. I noticed today there is something leaking (dripping) towards the rear of the car. I put my finger there and a dark brownish fluid came off. Any ideas? I know the tranny fluid is back there. The car is running fine. No loss of steering, brakes, tranny slip, or acceleration. Before i post the codes up, just know that I bought the car at a dealer auction and later i found out that the previous owner bypassed the whole tranny so it wouldnt come up with error codes. Long story short I had a rebuilt tranny put in with a 2 year warranty. Ok so here are the codes I got: 10 PCM P0719H and P1571H
28 TCS C1225H and C1226H
60 IPC V1016H and V1064H and V1040H
80 RADIO V1064H and V1096H and V116H
AO LDCM B2252H and B2262H and B2264H and V1064H
A1 RDCM B2253H and B2283H and B2285H and V1064H
A6 SCM B0851H and B0856H and B2606H and V1664H and V1016H
BO RFA V1255H and V1096H and V1064H and C2100HC
Like i said car is runnign fine. I also have a hypertechIII powertunner in there just to let you know. Only other modification is ram air. Thanks for all your help.

 

You need to clear the history codes and see whats left.

 

Then after you clear the all the codes drive it for a while and check the codes again. Here is a link to all the codes. Put this in a safe place.

http://forums.corvetteforum.com/show....php?t=1625418

 

First of all fill out your profile so members can target information to your specific Vette.

The leak at the rear is probably the dreaded diff seal leaking. Here's the TSB that explains that

http://www.corvetteactioncenter.com/...over+Flange%29

If you just had transmission work thay could have overfilled the fluid and it would vent off.

Check where the leak is from. Diff case bad, transmission probably OK.

Wrt the codes, the only current code you have is C2100HC which is the left front tire pressure sensor. If you check the DIC for tire pressures you'll probably have a XXX code/flag on that wheel. If so you'll probably need to replace the sensor. If its working you can ignore the code.

All the rest are history codes which means you've had a problem and it has gone away. Jot them down but if they don't come back you can rest easy.

 

DeeGee and the others are right, clear ALL the codes, and drive the car to see what pops up again.

The codes you list as starting with "V" actually start with a "U" (put your glasses on ..... ) and are communication errors between the different computers in the car. They are common in a Vette, and you can just go ahead and delete/ignore them.

Once you have a "clean" list of codes, post them and good folks like DeeGee will help you in diagnosing/fixing the problem.

 

OK so i cleared the codes and ran the car for two days. Here are the codes that i have now.
10PCM P1571H
40BCM B2527H
BO-RFA C2100 HC


Any ideas? Also I dont see any more of that fluid leaking on the floor towards the rear of that almost at where the wheels are. I live in NY and it has been pretty cold here... maybe the cold shrunk the seal slightly? Thanks for all your help

 

P1571 .... The Electronic Brake Control Module (EBCM) manages Traction Control (TC) to prevent rear wheel slip. One way it does this is it communicates with the Powertrain Control Module (PCM) to limit engine torque. The EBCM sends a signal to the PCM that is the "REQUESTED TORQUE" signal, and the PCM sends a "DELIVERED TORQUE" signal back to the EBCM. This code is thrown when the PCM receives either no requested torque signal, or the value requested is out-of-range.

Most often this is caused bt a wiring problem. Check the connectors to the EBCM for loose wires and/or corrosion. Also check that the EBCM is properly grounded and that the ground contact is clean and tight. The EBCM is grounded at G103 and G108. See Bill Curlee's excellent sticky at the top of this forum on electricla issues. On the wiring harness to the EBCM look at the ORN/BLK wire carefully, that is the "requested torque" signal wire.

B2527 .... The Body Control Module (BCM) is detecting an open or short-to-ground in the horn wiring when the BCM wants to energize the horn. If the relay control circuit is shorted to ground the horn will sound continuously. If it is open, the BCM cannot sound the horn, but the horn button on the steering wheel will still work.

C2100 ... Left Front Tire Pressure Monitor (TPM) Sensor malfunction. How old are the sensors? This may be a battery going flat in the sensor. If these are the original sensors on a 1997 you will need to replace the sensor. There are threads on here about replacing the batteries, you could search for those if you don't want to buy new sensors ..... the new ones are GM part number 10438853 and can be bought from supporting vendors such as gmpartsdirect or gmpartshouse ...

 

No need to worry about the P1571H code. This is a persistent code in 97s and here is the GM tech bulletin describing the problem.
History DTC P1571 Stored and Will Not Clear #PI00219 - (Jul 2, 2002)
History DTC P1571 Stored and Will Not Clear.

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

Condition/Concern:
Vehicle may have a DTC P1571 [ASR (Automatic Slip Regulation) Desired Torque Circuit] stored in history that cannot be cleared. DTC C1277 (Requested Torque Signal CKT Malfunction) is NOT present and there is No Service Vehicle Soon lamp or powertrain related lamps on.

Recommendation/Instructions:
This is a normal condition. All 1997 YBs will have a DTC P1571 stored as history in the PCM that cannot be cleared. If P1571 is current, follow the trouble table in SI Document Number 101551. It should be noted that the schematic in this document incorrectly lists a ckt 449 dk blu/wht and calls it Real Time Dampening. This ckt is not present and should be ignored for both 97 and 98 (Document Number 203769) model year SI. A Service Information Update has been submitted.

As for your intermittent TC/ABS issue the 97s had a tendency to throw a code which disabled the system every now and then. The code would get thrown when exiting hard turns under throttle. I had this problem consistently when I autocrossed my 97 and after a fair number of flat spotted tires, quite a few trips to the dealer finally found out through a GM contact there was a design issue in the 97 EBTCM which resulted in a new part number that became available in late 98.

Bill

 

As for your intermittent TC/ABS issue the 97s had a tendency to throw a code which disabled the system every now and then. The code would get thrown when exiting hard turns under throttle. I had this problem consistently when I autocrossed my 97 and after a fair number of flat spotted tires, quite a few trips to the dealer finally found out through a GM contact there was a design issue in the 97 EBTCM which resulted in a new part number that became available in late 98.

Bill[/QUOTE]

The EBTCM is an expensive part. Is that the only cure? I have this exact problem with my 97 only it happens when I take sharp turns at low speeds. It happens going into my driveway at home and sometimes if I start the car and immedietly back out (turning) of a parking space. Its sporatic too. Usually I don't see it for weeks but sometimes I see it a couple of times a day. I thought that maybe there was a sensor failing in the steering wheel or column.

Also, I'm ashamed to admit that I get all of this stuff mixed up. Is the EBTCM the body control module or is the antilock brake control? My body control module was replaced last summer. Anyway, I was wondering if it was the same part that is located under the hood (and fails frequently) of the 99 and up cars. If it is the part that I'm thinking of, it's attached to the rear end...yes?

I'm relatively new to working on C5's. Thanks.