Last post on Dec 11, 2013 at 12:34 PM
You are in the Pontiac Grand Prix
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Pontiac Grand Prix, Car Safety, Sedan
#194 of 215 Re: Traction Control/ABS
Aug 30, 2012 (7:37 pm)
I had the same problem on my daughter’s 2004 GTP. I read that the wheel sensors should have a resistance of 960 to 1040 ohms. I measured all four wheels and they were all about 1,100 to 1,120 ohms. I tried cleaning connectors, and even put four 1000 +/- 23 ohm resistors at the end of all four harnesses. I also cleaned the plug for the harness at the ABS ECM, and also the ABS power relay. None of this turned off the ABS warning message.
I checked the voltage at the end of each harness connector to the wheel speed sensors with the ignition turned on. Three of them were at 4.8 volts, and the RF was varied between 2.1 and 3.6 volts. As I shook the harness next to the RF brake, that voltage at the connector would jump up and down. With the connector still disconnected from the wheel sensor, I probed the length harness with pins and a voltmeter. At the ABS ECM, the RF circuit was 4.8 volts like the other three wheel circuits. As I moved along the harness, it stayed at 4.8 volts until I got to within about a foot of the wheel sensor. Then it dropped off to the lower level I measured at the wheel connector.
I eventually pulled the wires out of the harness guard, and cut open some of the shrink wrap around the wires. Even though the car had not been driven for 5 days, the wires were wet, and the inside of the shrink wrap was full of sand and salt. I think what had happened was that the dirt there eventually degraded the insulation on the wires and was allowing some current leakage that resulted in the voltage drop.
I intended to rewire this part of the harness and replace the end connector. I couldn’t get a new connector at the auto parts stores, but three different stores and a Chevy dealer sold a relatively short section of the harness with a new connector. My conclusion is that this mode of failure must be common, or all of the auto parts stores and GM dealers would not be selling a replacement harness section.
After wiring in the new section on the end of the RF wheel harness, the ABS warning light is no longer coming on.
#195 of 215 Re: Traction Control/ABS [terryq1]
Aug 31, 2012 (5:23 pm)
On further examination of the failed harness, I found a break in one of the wires inside of the insulation a few inches from the connector. This is an area where the wire would be twisted every time the steering wheel would be turned. The only reason I can understand for the wire to have any voltage at all is because the two broken ends must have been touching. The copper wire was also black and corroded.
#196 of 215 brake/track system problem
Oct 23, 2012 (4:24 pm)
hey guys, im going through the exact same thing with my 2004 pontiac grand prix. and i did my research and found a recall that described these issues. I contacted pontiac about this and they advised me to take the car to get a diagnois to make sure its a problem that relates to the recall and they will reimburse me the money it costed to get the dx and pay full cost for the problem. below im going to copy and paste all of the recall info. Hope this helps for all of us
Recall ID # 51199 - SERVICE BRAKES, HYDRAULIC
JUN 23, 2004
2004 Pontiac Grand Prix
CERTAIN PASSENGER VEHICLES WERE PRODUCED WITH LOWER THAN SPECIFIED TORQUE ON BOTH FRONT BRAKE CALIPER TO STEERING KNUCKLE ATTACHMENT BOLTS. WITH IMPROPER TORQUE, THE CLAMP LOAD AT THE JOINT MAY NOT BE ADEQUATE TO PREVENT MOVEMENT BETWEEN THE CALIPER BRACKET AND KNUCKLE.
DEPENDING ON WHETHER ONE OR BOTH BOLTS BACKS OUT OR FRACTURES, THE RESULT CAN BE LOCKING OF THE AFFECTED WHEEL DURING BRAKING AND AN ABRUPT STEERING INPUT IN THE DIRECTION OF THE LOCKED WHEEL, REDUCED BRAKING AND NOISE FROM THE AFFECTED WHEEL, OR SEVERING OF A BRAKE HOSE, INCREASED BRAKE PEDAL TRAVEL, AND REDUCED STEERING CONTROL. REDUCED BRAKING OR STEERING CONTROL COULD CAUSE A CRASH.
DEALERS ARE TO TIGHTEN BOTH BOLTS TO THE SPECIFIED TORQUE. OWNER NOTIFICATION BEGAN ON JUNE 28, 2004. OWNERS SHOULD CONTACT CHEVROLET 1-800-630-2438 OR PONTIAC 1-800-620-7668.
Potential Units Affected:
GENERAL MOTORS CORP.
Read more: http://www.motortrend.com/cars/2004/pontiac/grand_prix/recalls/#ixzz2AAflaNRm
#197 of 215 Re: Service Traction/Stability/ABS System [gmcustsvc]
Jan 02, 2013 (5:47 am)
Hi I Have an 04 Grand Prix GT last 8 numbers of the VIN : 41367899. After a very cold night(i was at the mall and I parked the car outside) the Service the ABS and the Service the Traction messages appeared. After I shot down the car and restarted the messages disappeared. I had to do this multiple times during the last 2 winters. This only happening when it's cold(I'm in MI) and I do a sharp turn. Just this morning (it's cold again) the messages will not go away even if I restarted the car multiple times Please give me an idea what I can do, thanks
#198 of 215 Re: Service Traction/Stability/ABS System [attilabokor]
Jan 02, 2013 (8:00 am)
1 of two things is going on. You either have a bad speed sensor which is built into the hub bearing assembly going out or you have a bad speed sensor cable. First thing first get the car scanned & find out which wheel it is. Once you know which wheel second get under there with the wheel removed & on a jack stand start wiggling the harness from where it plugs into the hub bearing as far as you can follow it. Turn the wheel back & forth & try to duplicate the light coming on while finding the cause. If you find the harness to be good I would change out the hub bearing assembly like $150 at Autozone & pretty simple to do. Good luck!
#199 of 215 Re: Service Traction/Stability/ABS System [eddie71]
Jan 02, 2013 (9:49 am)
Thanks Eddie, I started up again this morning after it was sitting for an hour, now the Service Traction/Stability/ABS System light are not coming on.... what you think?
#200 of 215 Re: Service Traction/Stability/ABS System [attilabokor]
Jan 02, 2013 (4:33 pm)
I think if u want to get rid of this gremlin get it scanned & start checking the speed sensor harness from the suspect wheel.
#201 of 215 Re: Service Traction/Stability/ABS System [eddie71]
Jan 07, 2013 (8:28 am)
I scanned it when it showed the errors, no error codes...
#202 of 215 Re: Service Traction/Stability/ABS System [attilabokor]
Jan 07, 2013 (9:09 am)
U have to have a scanner capable of pulling ABS specific codes. Then go under the ABS section to retrieve the "ABS" code. It will show no codes if you are in the PCM- power train section.
#203 of 215 Re: Traction Control/ABS lights on [ecugirl81]
Jan 18, 2013 (10:10 am)
To the ABS light needing a module. Go to CHEAP ABS. com they repair the module for 99.00 and guaranteed. I just had the same problem and my mechanic said it was 1200 to replace it. I looked on the internet for information and found their web-site. I got the module from my mechanic and sent it to them and they repaired it and it worked great. I have not had another problems with that.