Thread: help with abs codes and hiostory

well my abs, sts and tcs light popped up and rented a scanner and here is what i get

B1385 Device Ignition START Circuit = BCM?
B3950 left rear turn signal circut bcm
U1301 not sure about this one

then in history
P0856 traction control input signal

so i needs a little help figureing these out, but i think im about to spend some money. anybody have any good info i will give you a dounut. lol

Having much luck with that gxp? lol just playing but I really have no clue what any of those codes mean. Good luck though and a free bump.

U---- codes are module communication codes. those have to be fixed first, because no communication causes a lot of things to not work. short to battery means short to voltage though, not necessarily the terminal. some open wire on the feed side of any circuit. i'll try to remember to look the code up on service information tomorrow at work and give you an idea as to where to start. you're gonna have to forget the other codes until the U code is fixed though

Start with google and or getting teh actual GM info for the codes. The Diagnostic Aids are usually key in figuring these things out.

didn't get the chance to look today, had a bunch of sh!t going on with my mentor quitting...
couple things - global reset. disconnect the battery terminals and touch them together for about 30 seconds.
if you have a meter, make sure the key is off and test for 60 ohms of resistance at pin 6 and pin 14 of the data link connector to make sure your communication lines are in good shape. it should be GM LAN high speed anyways... if not, key on and check for voltage at pins 1, 2, and/or 5, something between 0-5 volts and changing constantly

data link? any diagrams, im new to the 04+ plus car, i would like to add my DIC seems to not be holding the date

the OBDII port under the steering column

your abs module doesn't have dexcool, it's the computer attatched to your brake master cylinder. if you don't have 60 ohms then you have a problem on a communication line. problem is, it could be any communication line. SI is supposed to work at my house, but it's not letting me log in. basically, you'd be looking for a short to voltage... somewhere in the car. i THINK that the turn signals are module controlled in the newer cars, so that code is probably related to the U code

ok, managed to get on and read through the info. for U1301, you cannot retrieve the code when it's current; the scan tool wouldn't communicate. so that is most likely an intermittent problem.
B3950 - does your left rear turn signal work?
B1385 - this one is kinda interesting. did you ever have a time where your car didn't start?
P0856 - this is kinda interesting, it's a fault on the communication line between the electronic brake control module (EBCM) and engine control module (ECM)

so, like i said, any time the car didn't start? what happened to set these codes?

gotcha lol. seems like you have a damaged communication wire somewhere around your bcm. your turn signals are controlled by the bcm, and the ignition switch is an input to the module as well. a short in that line would cause a no start

there ya go, that's probably it

So after replacing ignition switch random bcm codes went away the. The u1301 ended being a bad connection on the abs module. Thanks for all the help.