I searched everyone. I am getting alot of different solutions. I have a 03 Blazer LS and I am pulling several abs codes (C0241, 242, 245, 246, 251, 252 and 265). I believe i do have a ground issue somewhere that is hiding when it does go to a mechanic. 2 yrs ago fuel pump went. Replaced with a new one. checked the old one no problem. Wired everything back up right checked everything would not start. Had it rigged for about a year till my brother and a friend hooked everything back up as factory and miracle it runs. Changed the fuse box under the hood. When this happened the RPM jumps when i floor it. About to change the crank sensor that i am pulling a code for. I do have many more issues put working on one thing at a time. Just wondered if anyone else had this problem and what they did to fix it.

Maria

 

With those codes more then likely you're going to have to replace the ebcm and possibly the brake pressure modulator valve. All the codes except for C0265 lead to replacing the ebcm if after the codes are cleared they come back and more then likely the bpmv is all coroaded up and wont be able to work with the new ebcm. Not a very cheap fix!

 

Thank you so much. yea they do come back on when the codes are cleared. Sometimes right after clearing other times a day or so later. Thanks again

 

As for the crankshaft position sensor: DTC's never tell you to replace a part. If you followed the flow chart for the exact DTC that you retrieved, and it specifically instructed you to replace the crank sensor, fine. If not, don't replace it. If the sensor is moved, removed, replaced, or disturbed in any way, the crankshaft position sensor relearn MUST be performed. If it's not performed, the engine should still start and run, but not properly. Each crankshaft position sensor is unique and the PCM will use data from the last relearn. With the new sensor, the data is incorrect. The relearn requires a capable scan tool to initiate it. The el cheapo $500 jobbies that the auto parts stores use are not capable of initiating it.

 

All good info thank you

 

I have these exact same codes, however, I did not replace the fuel pump. According to 05BlackJimmy, it appears I should replace EBCM. Any advice for my issue would be appriciated.

 

Vacuum lines...

 

Please explain why you think vacuum lines can affect the ABS.

 

Because I replaced the crumbling hose and the warning lights went out....

Sounds like you guys don't know how the brake work.
Power brakes use vacuum to boost the brake pedal force.
A vacuum leak means no (or little) boost.
If the boost doesn't work, the ABS can't work.
That's a brake problem.

It cost $3 to fix a $1000 problem.
Try it.

HowStuffWorks "How Power Brakes Work"
or

 

The video does a pretty fair job explaining how the booster works. However, there are no vacuum lines associated with the ABS system. A vacuum leak in the booster supply line could/would cause engine DTC's to set, but not ABS DTC's. Hydraulic pressure is applied to the ABS unit from the master cylinder, it doesn't matter if the vehicle is equipped with power or manual brakes.

I'd look for a problem with the EBCM, possibly a power or ground issue.