c1271 c1273 need info
Thread Starter
1st Gear
Joined: Sep 2015
Posts: 1
Likes: 0
From: Sacramento CA
c1271 c1273 need info
Im brand new here and I need help. Ok so Ive had my 2000 c5 for a while now. Its been throwing the dreaded c1255 for about 6 months. From my research its pointless and impossible to fix. The service AH ABS TCS message and abs light would just come on from time to time when the vehicle was hot so I would just clear the codes and ignore it. But now the lights stay on all the time its pretty annoying. Not to mention detrimental to resale value.
Whats different now is that also throwing c1271 and c1273 as well. which are:
C1271 Front Master Cyl Isolation Valve Malf
C1273 Rear Master Cyl Isolation Valve Malf
They seem to have exasperated the abs light issue further
I looked up the part TCS Valve Solenoid its pretty inexpensive.
My question is can I get some general information on this part? How difficult is it to install? And am I even going in the right direction?
Anything you know about this situation would help. thx
Whats different now is that also throwing c1271 and c1273 as well. which are:
C1271 Front Master Cyl Isolation Valve Malf
C1273 Rear Master Cyl Isolation Valve Malf
They seem to have exasperated the abs light issue further
I looked up the part TCS Valve Solenoid its pretty inexpensive.
My question is can I get some general information on this part? How difficult is it to install? And am I even going in the right direction?
Anything you know about this situation would help. thx
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
Here are the diagnostics for those codes. In my opinion it is just the EBCM causing more issues.
With C1255 you can have no ABS, TC, or AH so I would recommend you try to resolve the EBCM issue before you throw money at these codes.
Remember the solenoid valves are in the EBCM which no one fixes for 97-00 at this point from my understanding.
Even if the BPMV is the problem you still need to deal with the EBCM. With C1255 I don't see how anyone could go through the diagnostics to see if the BPMV is an issue.
https://www.dropbox.com/sh/mcqbsqic2...VFR11Lbqa?dl=0
Sorry for the issue. Personally, I don't care if I have any of those EBCM features but it does affect car value.
What have you done to see if C1255 can be corrected? I have seen one case where it was corrected by addressing a bad connector and ground issue. Normally however when it is a hard locked in code it just can't be fixed on any year C5..
Mr. Sam
With C1255 you can have no ABS, TC, or AH so I would recommend you try to resolve the EBCM issue before you throw money at these codes.
Remember the solenoid valves are in the EBCM which no one fixes for 97-00 at this point from my understanding.
Even if the BPMV is the problem you still need to deal with the EBCM. With C1255 I don't see how anyone could go through the diagnostics to see if the BPMV is an issue.
https://www.dropbox.com/sh/mcqbsqic2...VFR11Lbqa?dl=0
Sorry for the issue. Personally, I don't care if I have any of those EBCM features but it does affect car value.
What have you done to see if C1255 can be corrected? I have seen one case where it was corrected by addressing a bad connector and ground issue. Normally however when it is a hard locked in code it just can't be fixed on any year C5..
Mr. Sam
