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alright fellas my truck was up on stands for about 2 months doing my t56 swap. Since finishing the install my service brake system light is on, abs light on, and emergency brake light on. I checked all the emergency brake stuff out and even took the dums off outback to check everything out. came up with nothing. What could be the problem with my truck. brakes seem to work fine. It bogging my truck down and making it run like crap. help me out here...:(
alright update so far iv tried this... tried unplugging the master cylinder brake fluid level sensor and also tried unplugging the brake light switch... problem still occurs. i also tried holding the reset button when the light comes on, hoping maybe it will reset. no luck. and i also unhooked the battery for more than 30 min. no luck as well.... someone help!
i changed the brakes on my girlfriends saturn and it did that, i never figured it out. around the same time this happened her trans. started messing up, it had a bad shutter and shifted up and down violently when it didnt need to be shifting, vss sensor?
i also cleaned the grounds on the drivers side for the e brake and all that good stuff at the front of the cab. i have no idea what is going on with this thing. 6 gear also shutters but im guessing thats from such high gearing in the rear 3:73 keeping it at around 1000 r's driving around. 5th is the sweet spot at 1700. vss? would that be in the trans or something electrical on the actual truck? no1 has had this problem but me?
Vehicle Speed Sensor, check the part number compatability on the sensor, if you have the wrong sensor installed it may be sending the wrong signal to your pcm which will really screw with the abs system. thats where i would start, you might just need a new/different sensor
x2Quote:
Originally Posted by molitor
was there a recall on this? i keep reading online that this could be a recall on my truck??? anyone have this happen to them?
tried a new vss .... still have the codes. now i also have a engine misfire code ontop. i really cant win. i cleaned and inspected the abs sensors in the front both looked fine to me. i also dont hear the abs pump humming when i turn the truck off and brakes seem fine to me. someone HELP!!!!!
what truck/year is it and what did you have b4 the t56?
2005 gmc sierra and it had a 4.8 5 speed which is now converted to a 4.8 6 speed via the t56
:nutz:, is it linked to a computer like an auto? every thing my avy. dose is linked to a computer, the difference in gear ratios and the extra gear might be throwing something into safe mode, might need a tune? or a really big hammer.
really big hammer... ha but from what iv been told by numerous local shops is that the abs system on our trucks runs completely seperate from everything else. it even has its own computer. so with that, a regular code scanner cant come up with the correct codes to pull for the abs system. so i have to either go to the dealer, find a shop with one of them expensive scanners, or get reallly lucky and find a buddy who has one. unless, hptuners can read abs codes? anyone know about this? the reason asking is i have to already get a tune for the t56 and theres the possibility that the tuner can pull the code? does this sound correct?
hptuners cannot read ABS, SIR, BCM, HVAC codes etc.. only PCM codes.
I also have autoenginuity and it can read all the above.
i think autozone loans the abs scanners out, just have to pay the deposit
ill have to look into that. i got the engine lights to go away and it runs awesome now. having this abs light on tho is kind of sketchy...
my truck was a auto before i put my 6 speed in. i have the same problem. i thought it was because my speddo is way off now. im pretty sure its the spped sensor on the tranny not seeing the same signal from the front abs sensor
i hope thats what it is. i mean mine was a 5 speed at first but as stated the speedo is waaaay off. I hope it doesnt hurt anything. gonna have a tune done as soon as i put my cam and gears in. But i LOVE the t56 such a huge difference
You need a tune for the T-56, the speed sensors operate differently, the ABS gets its speed readings from the PCM.
FINALLY i definate answer! thats exactly what i was looking for. alright cool sounds good to me. next weekend will be the cam swap, ill get a tune right after... thanks