Where is the ebcm located?

Electronic Brake Control Module Replacement

Removal Procedure

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1. Turn OFF the ignition.
2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
3. Remove the left front wheel. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
4. Remove the left front wheelhouse extension. Refer to Fascia Extension Replacement - Front in Bumpers.
Important The area around the electronic brake control module (EBCM) must be free from loose dirt to prevent contamination of disassembled ABS components.

5. Thoroughly wash all contaminants from around the EBCM.
6. Rotate the EBCM connector tab up to the unlocked position.
7. Remove the EBCM connector position assurance (2) from the EBCM electrical connector (1).
Caution! To prevent equipment damage, never connect or disconnect the wiring harness connection from the EBCM with the ignition switch in the ON position.

8. Disconnect the EBCM electrical connector (1) from the EBCM (4).


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9. Disconnect the brake pressure modulator valve (BPMV) electrical connector (2) from the EBCM (3).


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10. Remove the 6 EBCM to BPMV screws (2).


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11. Clean the surface of the EBCM/BPMV assembly.
Important The EBCM cannot be repaired. If faulty, the unit must be replaced.

12. Separate the EBCM (2) from the BPMV (1).

The above procedure is removal. Usually the code won't tell you what to replace. I don't know what testing you have done? Just reading the code might not be enough? The main reason I posted is to give you the location of module. Proper diagnostics is up to you. I hate to see you replace something and it not fix the problem. This is just my opinion.

p0504 brake switch A/B
break light switch, fuse or light bulb
p1629 theft deterrent system cranking single

U1040
DTC U1001-U1254 IPC, PCM, SDM

Electronic Brake Control Module (EBCM)
040

The control module ID number list below provides a method for determining which module is not communicating. A module with a class 2 serial data circuit malfunction or which loses power during the current ignition cycle will have a Loss of Communication DTC set by other modules that depend on information from that failed module. The modules that can communicate will set a DTC indicating the module that cannot communicate. When no message is detected from a learned identification number for 5 seconds, a DTC U1??? where ??? is equal to the 3-digit identification number is set.
Control Module
ID Number
Powertrain Control Module (PCM)
016
Electronic Brake Control Module (EBCM)
040
Dash Integration Module (DIM)
064
HVAC Control Module or IPM
065
Rear Integration Module (RIM)
066
Inflatable Restraint Sensing and Diagnostic Module (SDM)
088
Instrument Panel Cluster (IPC)
096
Head Up Display (HUD)
098
Radio
128
Remote Playback Device - CD Changer
130
Digital Radio Receiver (DRR)
137
Vehicle Communication Interface Module (VCIM)
151
Driver Door Module (DDM)
160
Front Passenger Door Module (FPDM)
161
Left Rear Door Module (LRDM)
162
Right Rear Door Module (RRDM)
163
Memory seat Module (MSM)
166
Driver Door Switch Assembly (DDSA)
170
Remote Control Door Lock Receiver (RCDLR)
176
Theft Deterrent Control Module
192
The electronic brake control module is communicating , no need to bother the PCM . The code was set in pcm because it lost communication with EBCM , PCM not the problem .
Electronic Brake Control Module (EBCM)
Left Front lower corner of the engine compartment, under the air cleaner housing .
Check power's an ground's . Will a scan tool talk to it ?

Nir, Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
2006 Buick code links explanation.

P0318 OBD II Check Engine Code Rough Road GMC General Motors

U1300 OBD II Engine Code GMC General Motors

P1629 OBD II Check Engine Code GMC General Motors

P0318 Audi Rough Road Sensor Signal Circuit

The reason of P0318 OBD-II Engine Trouble Code is Throttle/Pedal Position Sensor/Switch A Circuit Intermittent.

Do you know what U code's are for ? How did you pull this code ? There is no U0155 , U code's start at
Diagnostic Trouble Code (DTC) List
DTC
Diagnostic Procedure
Modules
U1000
DTC U1000 and U1255
Audio Amplifier, Cellular Telephone Module, DDM, DDSA, Digital Radio Receiver, DIM, EBCM, ESC, FPDM, HVAC Control Module - Auxiliary, IPC, IPM, LMDM, LRDM, MSM, PCM, Radio, Remote Playback Device CD Changer, RCDLR, RIM, RMDM, RRDM, SDM, Steering Column Module, Theft Deterrent Control Module, VCIM, Window Switch - Front Passenger w/armored car
U1016
DTC U1001-U1254
Audio Amplifier, Cellular Telephone Module, DDM, DDSA, Digital Radio Receiver, DIM, EBCM, ESC, FPDM, HVAC Control Module - Auxiliary, IPC , IPM, LMDM, LRDM, MSM, Radio, RCDLR, RIM, RRDM, RMDM, SDM, Steering Column Module, Theft Deterrent Control Module, VCIM, Window Switch - Front Passenger w/armored car
U1040
DTC U1001-U1254
IPC, PCM, SDM
U1056
DTC U1001-U1254
EBCM, PCM
U1064
DTC U1001-U1254
Audio Amplifier, Cellular Telephone Module, DDM, DDSA, Digital Radio Receiver, DIM, EBCM, ESC, FPDM, HVAC Control Module - Auxiliary, IPC, IPM, LMDM, LRDM, MSM, PCM, Radio, RCDLR, Remote Playback Device CD Changer, RIM, RMDM, RRDM, SDM, Steering Column Module, Theft Deterrent Control Module, VCIM, Window Switch - Front Passenger w/armored car
U1065
DTC U1001-U1254
DDM, DIM, ESC, FPDM, IPC, LMDM, LRDM, VCIM, HVAC Control Module - Auxiliary, PCM, Radio, RIM, RMDM, RRDM, VCIM
U1066
DTC U1001-U1254
DDM, FPDM, IPC, IPM, PCM
U1088
DTC U1001-U1254
IPC
U1096
DTC U1001-U1254
PCM, SDM
U1128
DTC U1001-U1254
Audio Amplifier, Cellular Telephone Module, Digital Radio Receiver, Remote Playback Device CD Changer, VCIM
U1129
DTC U1001-U1254
Radio
U1130
DTC U1001-U1254
Radio
U1137
DTC U1001-U1254
Radio
U1144
DTC U1001-U1254
IPC, Radio
U1151
DTC U1001-U1254
Radio
U1160
DTC U1001-U1254
IPC, RIM
U1161
DTC U1001-U1254
IPC, RIM
U1162
DTC U1001-U1254
IPC, RIM
U1163
DTC U1001-U1254
IPC, RIM
U1164
DTC U1001-U1254
DDM, Digital Radio Receiver, DIM, FPDM, IPC, LRDM, MSM, VCIM, Radio, RIM, RRDM, Steering Column Module
U1165
DTC U1001-U1254
DDM, FPDM, LRDM, RRDM
U1176
DTC U1001-U1254
IPC
U1192
DTC U1001-U1254
IPC, PCM
U1255
DTC U1000 and U1255
Audio Amplifier, Cellular Telephone Module, DDM, DDSA, Digital Radio Receiver, DIM, EBCM, ESC, FPDM, HVAC Control Module - Auxiliary, IPC, IPM, LMDM, LRDM, MSM, PCM, Radio, Remote Playback Device CD Changer, RCDLR, RIM, RMDM, RRDM, SDM, Steering Column Module, Theft Deterrent Control Module, VCIM, Window Switch - Front Passenger w/armored car
U1300
DTC U1300, U1301, or U1305
Audio Amplifier, Cellular Telephone Module, DDM, DDSA, Digital Radio Receiver, DIM, EBCM, ESC, FPDM, HVAC Control Module - Auxiliary, IPC, IPM, LMDM, LRDM, MSM, PCM, Radio, Remote Playback Device CD Changer, RCDLR, RIM, RMDM, RRDM, SDM, Steering Column Module, Theft Deterrent Control Module, VCIM, Window Switch - Front Passenger w/armored car
U1301
DTC U1300, U1301, or U1305
Audio Amplifier, Cellular Telephone Module, DDM, DDSA, Digital Radio Receiver, DIM, EBCM, ESC, FPDM, HVAC Control Module - Auxiliary, IPC, IPM, LMDM, LRDM, MSM, PCM, Radio, Remote Playback Device CD Changer, RCDLR, RIM, RMDM, RRDM, SDM, Steering Column Module, Theft Deterrent Control Module, VCIM, Window Switch - Front Passenger w/armored car
U1305
DTC U1300, U1301, or U1305
Audio Amplifier, Cellular Telephone Module, DDM, DDSA, Digital Radio Receiver, DIM, EBCM, ESC, FPDM, HVAC Control Module - Auxiliary, IPC, IPM, LMDM, LRDM, MSM, PCM, Radio, Remote Playback Device CD Changer, RCDLR, RIM, RMDM, RRDM, SDM, Steering Column Module, Theft Deterrent Control Module, VCIM, Window Switch - Front Passenger w/armored car

The data link connector (DLC) allows a scan tool to communicate with the class 2 serial data line. The serial data line is the means by which the microprocessor-controlled modules in the vehicle communicate with each other. Once the scan tool is connected to the class 2 serial data line through the DLC, the scan tool can be used to monitor each module for diagnostic purposes and to check for diagnostic trouble codes (DTCs). Class 2 serial data is transmitted on a single wire at an average of 10.4 kbps. This value is an average; class 2 uses a variable pulse width modulation to carry data and depending on the message it may operate faster or slower. The bus will float at a nominal 7 volts during normal operation. Each module can pull this lower during the transmission. The bus is not at battery positive voltage or ground potential during normal operation. When the ignition switch is in RUN, each module communicating on the class 2 serial data line sends a state of health (SOH) message every 2 seconds to ensure that the module is operating properly. When a module stops communicating on the class 2 serial data line, for example, if the module loses power or ground, the SOH message it normally sends on the data line every 2 seconds disappears. Other modules on the class 2 serial data line, which expect to receive that SOH message, detect its absence; those modules in turn set an internal DTC associated with the loss of SOH of the non-communicating module. The DTC is unique to the module which is not communicating; for example, when the inflatable restraint sensing and diagnostic module (SDM) SOH message disappears, several modules set DTC U1088. Note that a loss of serial data DTC does not normally represent a failure of the module that set it.

Your best bet ,take it to a qualified repair shop.

The EBCM (Electronic Brake Control Module) is mounted to the BPMV (Brake Pressure Modulator Valve) located at the left front (lower) engine compartment.

EBCM Removal & Installation Procedure

1. Remove the Brake Pressure Modulator Valve (BPMV). Refer to the Hydraulic Control Unit (BPMV) procedure in this section.
   
2. Remove the 4 T-25 Torx® bolts (1) from the EBCM (2). (click image for zoom)
   
   
   Fig. Bolts (1), EBCM (2), bracket (3), bolts (4) and BPMV (5) (click image for zoom)
   
   
3. Disconnect the 2-way ABS pump motor connector.
   WARNING Do not use a tool to pry the EBCM or the BPMV. Excessive force will damage the EBCM.
   
4. Remove the EBCM (2) from the BPMV (5). Removal may require a light amount of force.
   1. Do not reuse the EBCM mounting bolts. Always install new bolts.
5. Clean the EBCM to BPMV mounting surfaces with a clean cloth.

To install:

WARNING Do not use RTV or any other type of sealant on the EBCM gasket or mating surfaces.

1. Install EBCM (2) onto BPMV (5).
   
2. Install the 4 EBCM bolts (1).
   1. Tighten the 4 bolts to 39 inch lbs. (5 Nm) in an X-pattern.
3. Connect the 2-way ABS pump motor connector to the EBCM.
   
4. Revise the tire calibration using the Scan Tool Tire Size Calibration function.
   
5. Use the scan tool to check and clear DTC memory.

Hope this helps.

This code pertains to communication from one computer to the next,they all are on a communication circuit (class II) & you have a short to ground somewhere.If a scan tool is able to communicate with the computer(and it is since you got a failure code) this code is intermitten.Get a good volt meter or scan tool & start at the ALDL (where the scanner plugs in).Inspect & check wiring as you keep an eye on the scanner or meter.

DTC Parameters
DTC U1300 will set if the EBTCM, PCM, or SDM detected the Class II circuit in the low state for too long. (Class II circuit shorted to ground) when:
• Condition exists for longer than 4 seconds for EBTCM, 2 seconds for PCM and SDM.
• Ignition is On.

DTC U1300 diagnostic runs continuously with ignition On.

DTC U1300 is a type C DTC.
Diagnostic Aids
If the scan tool can communicate with the EBTCM, PCM or SDM, then the Class II link is not currently shorted to ground.

Inspect the wiring harness for signs of chafing or broken insulation.

Important: The controller name won't be displayed until the scan tool initially received the correct controller ID over the link upon ignition On.

Important: The BCM CANNOT set U1300.

To locate an intermittent problem, use the scan tool to monitor any of the controllers on the Class II link located under DIAGNOSTIC CIRCUIT CHECK - - - CLASS II MESSAGE MONITOR with ignition On, engine Off. INACTIVE will be displayed on all controllers if the link is shorted to ground.


Hope this helps (remember to rate this answer).

Hi, if you are receiving a u1040 code ,the car needs to be put on a good scanner to see which module is not communicating this includes the pcm-ebcm-bcm-sir/sdm-ipc-radio and the pass key 111, you need to check the battery hots, ignition hots ,grounds and serial data lines to each module if the scanner cannot communicate with any of the modules, the serial data line will have a very low amount of voltage and will be moving between low voltages check all the fuses and relays battery connections and grounds, the ignition relay is a good one to check, also for the antitheft reprogram relearn there is a 30 minute relearn process ;;try to start the vehicle and release the key do not turn it off wait ten minutes until the security light goes out then turn the key off for 5 seconds and turn the key back on wait 10 more minutes for the light to go off again turn the key off for 5 seconds and then back on for 10 minutes more after the light goes off turn the key off for 5 seconds and now try to start the car, if it still doesn’t start then check for any connections under the hood for water damage or critter damage.

Take care