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Old 06-27-2015, 02:08 PM   #1 (permalink)
jim z
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service trailer brake system codes?

service trailer brake system comes up on the dic. took it to the dealer and says it has the following codes:C0561 and C0131. they say to replace the brake pressure modulator valve but that may not be the problem. if that doesn't fix it then they will replace the EBCM. truck is 12 denali hd that went out of warranty in jan 2015. does this only effect the trailer brakes or the entire truck brake system? can an aftermarket brake controller be installed? each item installed is about $500 parts and labor. I don't want to just have them start replacing stuff til they figure it out. thanks

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Old 06-27-2015, 05:58 PM   #2 (permalink)
Ron Nielson
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Here is some information about your problem. CO561 says fix C0131 first. It would be good to know more precisely which variant of DTC C0131 they found.



DTC C0131 (Greater than or equal to 8600lb GVW)

Diagnostic Instructions


  • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
  • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
  • Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors

DTC C0131 01: ABS Pressure Circuit Short to Battery
DTC C0131 03: ABS Pressure Circuit Voltage Below Threshold
DTC C0131 06: ABS Pressure Circuit Short to Ground or Open
DTC C0131 0F: ABS Pressure Circuit Erratic
DTC C0131 4B: ABS Pressure Circuit Calibration not Learned
DTC C0131 5A: ABS Pressure Circuit Plausibility Failure
DTC C0131 55: ABS Pressure Circuit Expected Number of Transitions or Events not Reached

Circuit/System Description

The electronic brake control module (EBCM) monitors the brake pressure sensor. The information the EBCM receives from the brake pressure sensor is sent through serial data circuits to the trailer brake control module(TBCM). The TBCM uses this information to perform trailer brake functions. The brake pressure sensor is mounted to the master cylinder.

Conditions for Running the DTC


  • The ignition switch is in the ON position.
  • Ignition voltage is greater than 9.5 volts.
Conditions for Setting the DTC


  • Pressure signal does not correlate to estimated Pressure over time.
  • Signal is erratic and changes faster than physically allowed.
Action Taken When the DTC Sets


  • The EBCM disables the vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
  • A DIC message and/or a warning indicator may be illuminated.
Conditions for Clearing the DTC


  • The condition for the DTC is no longer present.
  • The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Circuit/System Testing


  1. Ignition OFF, disconnect the harness connector at the brake pressure sensor.
  2. Ignition OFF, test for less than 5 ohm between the low reference circuit terminal A and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance.
  1. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal B and ground.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage.
  1. If all circuits test normal, test or replace the brake pressure sensor. If DTC resets, replace the EBCM.


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Old 06-27-2015, 06:09 PM   #3 (permalink)
jim z
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They gave me a copy of document id#2138519. it has a mark next to DTC C0131 01 so I am assuming it is that one.
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Old 07-29-2015, 09:56 AM   #4 (permalink)
Rwj105
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I have an 08 and my service trailer brake comes on with our without trailer attached. But it only does it when I put it in reverse. I've changed or the trailer brake relay but I don't want to spend the money on the module is that isn't the issue either. Does anyone know how I can test the system to so if it is a module or a wire itself
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Old 08-12-2016, 04:57 PM   #5 (permalink)
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I was pulling an excavator the other day and had to hammer on the brakes and my service trailer brake system came on. My truck is a 2008 lmm. I changed the pressure sensor in the master cylinder, nothing changed. FYI, comes on even with out the trailer. I got to looking and notice the J fuse was blown for #56. Changed it, trailer brakes started working. Lasted about 30 seconds went off again but didn't blow the fuse. So next I changed the relay under the bed, nothing changed. I took it to the dealership and a buddy scanned it with a tech 2 and it had the C0131 symptom 04. He couldn't see anything on his GM service site that referenced that. Would this be the same as 4b listed above?
He did use the tech 2 to read the pressure voltage change when pushing the brake, it was fine. Any ideas?
I hate to keep changing parts hoping for the best.
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Old 08-12-2016, 05:20 PM   #6 (permalink)
Ron Nielson
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I don't have any ideas, except if you had a friend with whom you could exchange ECM's to see if a different ECM fixes the problem. Also, I note, that there are several posts from others who have had problems after slamming on their brakes. Perhaps you could search for other threads and see if anyone has solved their problems.
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Old 08-14-2016, 07:28 AM   #7 (permalink)
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I appreciate your help Ron. I will try searching for those threads. It's pretty aggravating when you can't track down the problem.
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Old 08-25-2016, 08:09 PM   #8 (permalink)
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Changed out the module and had it flashed. Made it about 3 miles, service trailer brake system came back on. I have now changed the pressure sensor, relay and module. I can not find and bad places in the wiring or any blown fuses. Rear trailer brake plug on the back of the bumper looks clean, but put diaectric grease in it anyway.
Any thoughts? I am about to pull my hair out.
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Old 08-25-2016, 09:06 PM   #9 (permalink)
heymccall
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We're the front brakes bled after changing the pressure switch? They need to be bled when the switch is changed.
Trailer plug and all the trailer harness under truck are unrelated.
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Old 08-25-2016, 09:41 PM   #10 (permalink)
WvGearhead
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Yes, front brakes were bled.

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