I serviced my 2004 yukon for abs light came on they told me it was the right front abs speed sensor wire , which is sold sepratly or with wheel hub cost$ 300 or 57$ for just sensor wire, i did all brakes changed sensor and for awhile the stayed off but comes on and at about 20 mph it turns off ?
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from the sounds of it it either had a voltage drop to the chassis or a ground connection fault, my guess is a the ground to chassis went bad, reason is grounds usually cause multiple systems failures, its time consuming to check the all , but first check all fuses
C0550 is the code for the ABS module. It is on the frame under the vehicle around the drivers door area. It is a module with all the brake lines coming from it. Reset the trouble codes and see if the problem returns. If it does, the module is not serviceable and will need to be replaced.
it should come on at intial start up and immediately go off, its' in self check mode... if it is staying on longer than it should then have it scanned with a abs scan tool at you dealer or trusted independant repair shop, please rate my help, thanks...
check under vehicle on frame rail drivers side, should see abs assembly, disconnect red wire buzzing will stop, will have to replace assembly, will not have abs braking, will have base brakes, if red brake light comes on do not drive vehicle, have towed to repair shop
The dealer will charge you $1300 - $2000. Contact Module Masters. They are great to deal with. You have to ship it to Moscow, Idaho. It cost me about $15 to ship it (with box, packing, and insurance at a UPS store). They charged me $130 to rebuild it and gave me a 5 year warranty. It cost $8 to ship it back. To in total, it cost me $153....totally turn-key.