mrm13

I don't know if this has been covered and I appologize if it has, but I did not see it.
The other day on an exit from the highway I was on a dusty patch. The wheels spun a little, the traction kicked in and then both the traction control and ABS lights came on. The DIC started rotating the "service active handling", "service anti lock brakes" and "service traction control" messages. I parked the car to fill her up at a gas station. When I was done and started her up there were no lights and no messages. Today I just started the car and the same lights and messages appeared again.
Is this common and does anyone know what causes it?

Bill Curlee

When it happens again, immediately read and write down your DTCs:

WHAT YEAR C5????????? Please fill out your avatiar.....

READING YOUR Engine Diagnostic Codes (DTCs)
The Diagnostic Display Mode is entered with the following procedure:
1) Turn on the ignition but don't start the engine.
2) Press the RESET button to turn off any warning messages. (i.e. door open, trunk open etc…)
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 code indicates a malfunction is present 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 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 RESET
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.

Here is very good site of DTC definitions:


http://www.gearchatter.com


Make sure to include the H or C suffix!!

mrm13

Thank you, Bill. I am a newbie here and I am not sure how to edit my avatar, but I'll figure it out.
My car is a 2000 manual.

mrm13

Ok, this is what is showing me now
10-pcm
P0171 H
P0174 H
P1431 H

28-TCS
C1243 H

99-hvac
B0361 H C
B0367 H
AO-ldcm
B2252 H
B2282 H
B2284 H
U1255 H
U1064 H
U1016 H
U1096 H

A1-Rdcm
B2283 H
B2286 H
U1255 H
U1064 H
U1016 H
U1096 H

BO-rfa
U1096 H
U1064 H
U1016 H

Should I clear them all and then see what comes back?

Bill Curlee

Hell yes!!! PLEASE Do.

Report back what returns during a drive.

BC

mrm13

I did and I will go for a ride in a little bit. Two questions:
First on the site you provided I found all the Pxxxx codes, but none of the Cxxxx, Bxxxx or Uxxxx codes. Where do I look up those? I will invest in a manual, but I would like to know what is going on meanwhile.
Second, you mentioned if the trac/abs/handling thing happens again, to check right away. Do I follow the same procedure above or there is a different one while engine is running?
Thanks for the help. It is greatly appreciated.

mrm13

Oh, and I forgot!
Where do I find what the modules stand for? HVAC is pretty self explanatory, but the rest are Chinese to me.

Bill Curlee

Here is the list of codes:

http://www.stengel.net/diccodes.htm

PCM Power Train Control Module
BCM Body Control Module
SDM Sensing Diagnostic Module (Air Bags)
SCM Seat Control Module
LDCM Left Door Control Module
RDCM Right " " "
RFA Remote Function Actuator FOBs and Tire Pressure sensors

TCM Traction Control Module EBTCM

IPC Instrument Panel Console

RTD Real Time Dampening F45 suspension

mrm13

Thank you soooo much. So basically nothing serious with this history.
I bought the car out of state and drove it back. On the way back I got a check engine light, so I pulled in a gas station and popped the hood. It did not take long to see that the accordion connecting the MAF and the air bridge had popped out a little on one side. I plugged everything back and tightened the clamp. Then the engine light disappeared.
I guess that puts to rest the PCM codes. Now that traction control code is what bugs me.
"BPMV pump motor stalled" - What is the BPMV pump?

Bill Curlee

Read this post. It describes what the Brake Pressure Moulator Valve is... The motor BOOST brake pressure when you actuate the Antilock Brake System or Active Handling.

Yours is gummed up frpm NON USE!

- C5 SJBROTHERS, EBTCM DTC 1243 DC Current: http://forums.corvetteforum.com/c5-t...post1572045355

Your going to end up running the motor from an external power source to exercize the motor and loosen it up.

Bill

mrm13

Thank you very much.
Now where do I find the part and also how do you flush it?

Bill Curlee

The resolve is to remove the EBTCM from the BPMV and run the BPMV pump motor until it frees up.

If you have never changed your brake fluid, do that first and then run the pump motor.

BC

lionelhutz

Just running the motor doesn't get new fluid into the BPMV assembly. Best is to flush the fluid and then put the car on stands and run it in 1st gear so the TC comes on and tries to brake the rear wheels. This will also operate the valves inside the BPMV and move the fluid around inside the BPMV assembly. You can also remove the rear wheels, put the nuts back on to hold the rotors and then open the rear brake bleeders while doing the above so it pumps new fluid from the master through the BPMV and out to the rear brakes.

If the motor won't run you'll have to get it running first by removing the EBTCM and powering the motor.

Actually, the best is to get a dealer to use a TECHII and open the valves and run the motor when bleeding the fluid but you may not want or trust them to do this.

You can also use a wet or sand covered road and brake hard enough to kick the ABS in to exercise the system.