My Gosh my C5 must be the Da Vinci Code vehicle of the Corvette Forum. As I have the notorious service ABS and Traction Control messages and lights on (intermittant but increasingly staying lit)...I finally did a code scan on the vehicle. To my surprise I got 22 stinkin codes from the DIC, none of which is a 1214 code i was expecting to find. First off should I try to clear all the codes, how is this done? My thinking is the car had previous issues that were addressed but the car is still storing the info. How long should I drive the car after ressetting codes-as soon as it flashes problems again? For anyone wanting to help out and start letting me know what some of this means here you go...:

A6-SCM No Codes
10-PCM No Codes
A6-ACM No Codes
28-TCS C1243 H
40-BCM No Codes
58-SDM No Codes
60-IPC U1160 H
99-HVAC B0361 H C
A0-LDCM B2252 H
B2282 H
B2284 H
B2262 H
B2264 H
U1064 H
A1-RDCM B2239 H
B2203 H
B2283 H
B2285 H
B2263 H
B2265 H
U1255 H
U1064 H
U1016 H
U1096 H
B0-RFA U1096 H
U1064 H
U1016 H

After looking at these does the H symbolize History? If so I don't see too many C-Current issues.....I may need to go back and make sure that the U and B prefixes are correct and that the H and C are correct. Any heads up on any of these issues is GREATLY APPRECIATED! Hopefully i'm not in as much trouble as it looks like.

Kevin

 

The way DTC codes are structured is

Axxxx CH

where position A is either a P (Powertrain), B (Body), C (Chassis) and U for communication issues on the data bus.

The xxxx are numbers, and then at the end is either a C (Current) or H (History). Some codes can have both an H and a C.

The Uxxxx codes can be deleted. They pop up occasionally when one of the computers can't talk to another at th4e moment that it wants to. This is usually due to the data bus being busy. These occur on every C5 and even the Service Manual has no diagnostic for them ... it says to delete them.

I'd delete ALL the codes from the car, and then check it again after driving it for an hour or so. If there are any problems the codes will have posted again.

To delete the codes go here for instructions ...

https://www.corvetteforum.com/techti...D=26&TopicID=1

 

Thanks a bunch for the clarifications...hopefully then I don't have too many issues going on at once...

K

 

Hmm...def need to recheck my list...doesn't make sense why I'd get the Service ABS and Traction Control warnings if my only current issue is an HVAC code...

K

 

The C1243 from the TCS module is indicating a problem with the EBCM. Clear it, but it will probably return the next time you get the SERVICE AH etc. messages.

 

That link is for C6, here is the correct one.

corvetteforum.shelor.net/Docs/C5%5FOn%2DBoard%5FDiagnostics/

 

This is from a code book...

C1243 BPMV Pump Motor Stalled (not EBCM)

Any thoughts???

K

 

I just posted a new thread regarding ABS c1226 problems. Where did you get your codes? The service manual is not much good. What is the source of your codes.
For months I was getting a C1226 code...an internet source who printed all the codes indicated that it was a LF wheel bearing/abs sensor. Wrong! C1226(even number) refers to the right side. Odd numbers are left.
I can fax you the codes I have if you wish, but I would like to know where your source for the codes is.

 

I should have looked up the code ... but here's the deal ....

The EBCM (Electronic Brake Control Module) is the "brain" that handles functions of the braking system, such as ABS, and decides when to engage or disengage the brakes. The BPMV (Brake Pressure Modulation Valve) is the "muscle" of the system, it is the pump that actually applies and releases brake pressure at the command of the EBCM.

If you look under your hood the two units are directly bolted together. The BPMV is the unit with the brake lines for each wheel coming out of it, and the EBCM is the attached unit with the wiring bundles attached to it.

If the C1243 re-appears, unfortunately, the service manual shows that after checking for a bad wiring coonection to the EBCM, replacement of the BPMV is the fix.

 

Try this link for codes ....

http://www.davidfarmerstuff.com/c5-dtc.pdf

GM changes the "meaning" of some codes over model years, so be aware of which year/model the code list is for. Codes that start with a zero .... for example a P0300, are mandated (locked) by the rules of OBD2, but codes that start with a higher digit .... such as a P1153 are manufacturer defined, and can be used in any way the OEM wants.

 

Sorry i've got 2 screen names but...use this link Z06 provided earlier...

http://forums.corvetteforum.com/show....php?t=1791731

and click the link that says downloadable word document file of IPC codes...along with davids stuff you will get descriptions of acronims (SP?) as well. Big helps! Thanks

Kevin

 

Correction, use this link:

https://www.corvetteforum.com/techtip...D=26&TopicID=1

K

 

OMG! Didn't work...so just click the link in the 2hnd reply to this topic and you'll find the next link for the word doc file.

K