2007 Chevrolet Silverado ABS and emergency light on

Tiny
PICCOR
  • MEMBER
  • 2007 CHEVROLET SILVERADO
  • 6.6L
  • V8
  • TURBO
  • 4WD
  • AUTOMATIC
  • 55,000 MILES
My 07 new body style is showing service trailer brakes in the DIC window and the ABS and Emergency brake lights are on all the time. Problem started at the begging of a 1200 mile trip from western Or. To Eastern Colo. Towing a 10,000 pound load on my gooseneck trailer. Just prior to starting my trip I did notice a few drops of water dripping from under the dash in the area of the factory installed brake controller it had been raining extremely hard that day and I paid little attention to the leak. When I got home from the trip I started searching the forums for ideas and I did the following, I checked all the wiring, grounds, and connectors I checked for play in the front hubs I pulled the hubs of and cleaned and reinstalled the speed sensors During all this inspection I found a leaking oil cooling line, a leaking axel seal (right rear) and cracks in the brake pads Which was probably a result of driving with out ABS or trailer brakes.(The trip started late on Friday and ended late on Sunday in very rural parts of both states=no mechanics available) Nothing I did resolved the problem so I took it to the dealer to have the problem diagnosed and for $102.00 they gave me 2 codes and no explanation. First code is DTC C0558 s00 set current in EBCM second code is DTC C0561 sf1 set in trailer brake control module. Also says checked ED power and ground circuits to ECBM for wiring faults OK found ECBM to be internally malfunctioning causing concern. I replaced the brake controller with an after market brake controller part #90195 following instructions that required running a new 12 ga blue wire from new controller to back of truck and cutting old blue wire and connecting new wire to the blue wire going to the trailer plug, and using the factory wires supplied by GM for after market controller. Nothing changed still have all the same problems that I started with. Can you help? Thanks R.P.
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Monday, May 25th, 2015 AT 8:17 PM

5 Replies

Tiny
HMAC300
  • EXPERT
They did give you an answer but just one that is hard to understand. The ebcm is the abs unit and it says it has an internal malfunction so it either has to be replaced or rebuilt. Both codes are for the abs unit and when it goes out it knocks out other systems as well like your trailer brake as well as stability because they all have to work together. By putting the system you did on the truck won't work as far as abs or having any of your lights go out. You will have brakes but no abs because when you have the trailer all of that has to work together. The abs unit will also control the trailer brake so it will have abs as well but now it won't. Like most dealers you don't get to talk to the mechanic who would explain and you just get the bill with what they decided to put on it.
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Tuesday, May 26th, 2015 AT 6:20 AM
Tiny
2CARPROS MIKE
  • ADMIN
Piccor

I did put a new BCM on the truck and it made no difference. I also had the rotors turned and bought new brake pads and rear inner seals that I will install this weekend. I hoped this would be something I could fix myself but its looking like I'm going to have to take it to a shop and let them take a look at it but from what I've read they end up doing a lot of guessing and charging hundreds if not thousands of dollars (scary thought)
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Monday, June 1st, 2015 AT 11:24 AM
Tiny
HMAC300
  • EXPERT
If you put a new abs unit on the truck then you need a pro to erase the codes as they will onl go away by doing that so have them erased and see if they come back if they do it's a wiring or connection problem. Any garage with a scanner can erase the codes for you
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Monday, June 1st, 2015 AT 12:38 PM
Tiny
PICCOR
  • MEMBER
When installing the new pads and E-brake shoes I found a small leak in the right rear caliper and I ordered a new that I will install asap and then I will have the codes erased. Could the leaking caliper be the source of the original problem?
Thanks R.P.
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Monday, June 1st, 2015 AT 6:47 PM
Tiny
HMAC300
  • EXPERT
No not at all check all around the sensors for rust on them as the sensor is magnetic and if it has some rust on it will screw it up. But I really think this problem lies elsewhere.
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Tuesday, June 2nd, 2015 AT 6:20 AM

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