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Im getting a U1040 code- (loss of communication with brake control module

Replaced left knee,and brake hose/line,bled brakes.also replaced column. Brake,abs,service vehicle lights are on

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  • Chevrolet Master
  • 1,209 Answers

Loss of communication with brake control module is exactly what it says. There is a problem with the wiring harness that goes to the ABS controller. You might make sure it is plugged all of the way in. You might also unplug it and make sure there is no corrosion or damages pins in the connector.

Posted on Apr 23, 2013

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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csmock132
  • 4669 Answers

SOURCE: 98' Ford Windstar has a spongy brake

Have you had anyone try to clean and adjust the rear brakes? You will need a shop to scan the van for ABS codes first to cure the ABS light.

Posted on Mar 02, 2009

  • 2 Answers

SOURCE: transmission doesnt shift abs & brake light on speedometer doesnt work

I had the same problem with ABS light and speedometer, I was told that it is the transmission control module. It has not yet stopped shifting but I have had times where it just wont stay running. It will start and then stall. Hope this helps.

Posted on May 24, 2009

yotaguy
  • 232 Answers

SOURCE: brake light stays on after replacing brake line and bleeding

You may need to do a code scan,this will reset the computer and reset any codes if the brake problem has been taken care of.Autozone Shucks/Kragen/O'Reilly's will do this for free.

Posted on May 31, 2009

co7196
  • 3433 Answers

SOURCE: bad brakes on gmc suburban,

Gravity bleed your brakes starting at the wheel farthest from the master cylinder. No pweddle pumping. I Fill M/C and leave cover off. Then open the bleeder and watch what is coming out. Uou can see bubbles. When the fluid drips steady and without bubbles, cole and do the same to the other three. Don't let the master cykinder get low because thr fluid level helps move the fluid and air through the lines.Periodically tap the break lone with your wrench to keep everything moving.. When sll bleeders drip clean and steady. Make sore your rear brakes are adjusted to barely touch the drum. Then top off the master cylinder, cap it and give yourself a "break". :)

Posted on Jun 15, 2009

ourhowse
  • 2007 Answers

SOURCE: no brakes, relaced rear brake shoes. abs, and brake lights still

Replace master cylinder.

Posted on Jun 19, 2009

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I have a 2003 bonniville sle i have a code U1040. Where is the EMCM AND PCM LOCATED


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 ?

Oct 03, 2016 | Cars & Trucks

1 Answer

2002 Lincoln Town car - very low brake pedal, uneven braking with very little back brakes, nosedives when braking. replaced master cylinder, bled 3 times, no leaks or bulging lines. I replaced the ABS pump...


The ABS brain block is defective! Will have to be replaced. Big aluminum block with a lot of lines to it. =Usually down low under the master cyl.

Sep 04, 2013 | 2002 Lincoln Town Car

1 Answer

2001 Silverado 2500 HD Why Rear brakes don't work after I installed new hydro-boost power booster, master cylinder, calipers, and pads. I bled master cylinder before installing, and brakes beginn


Hello Patricia,

Have you checked the master brake cylinder reservoir for brake fluid loss?

I don't suspect the master cylinder as you have replaced it... but am more suspect of a leaking brake line or fitting which should have
been discovered when you had the system bled.

The only time I ever had a rear brake problem with a 2500 series Chevrolet was due to seized rear brake caliper guide pins...as your calipers are also new that is not your problem.

If your brake pedal feels spongy and travels to the floor board you have air in the system, a brake fluid leak or a failure in the power steering system, such as a broken hose, broken power steering pump drive belt, or failed pump, would result in a loss of pressure to both the hydro-boost and steering.

Find more information here:

. Hydro Boost Power Assist Systems Operation Diagnosis and Repair

Jul 23, 2017 | 2001 Chevrolet Silverado 2500HD

2 Answers

!996 Chevy Astro AWD pulls to the left when braking , I have replaced Both front calipers, rotors, and pads bled the brake lines and still it will pull to the left MOST OF THE TIME! when i least expect...


Check front end steering linkages for any play, as well as rear brakes for sticking or grabbing as well. Not unusual for a rear brake grabbing, to cause front end to want to wander.

Jun 05, 2011 | Chevrolet Astro Cars & Trucks

1 Answer

I have a 2004 cadillac deville dhs has 12,000 miles on it was driving and the lights on started chiming and blinking and emergency flasher lights come on and blink hit the flasher button no help got a few...


DTC B2507
Seat Temperature and Mode Signal
DTC B1860
Driver Lumbar Vert Sensor CKT Malf
DTC C1295
Brake Lamp Switch Circuit Open
DTC C0665
Chassis Pitch Signal Circuit
DTC U1000 and U1255
Class 2 Communication Malfunction
DTC U1001-U1254
Lost Communications With ***
Circuit Description
Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message. These node alive messages are used for State of Health monitoring. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. When a module does not associate an identification number with at least one critical parameter within 5 seconds of beginning serial data communication, DTC U1000 or U1255 is set. When more than one critical parameter does not have an identification number associated with it, the DTC will only be reported once. The following modules communicate on the class 2 serial data circuit:
• Audio amplifier
• Cellular telephone module w/UV8
• Dash integration module (DIM)
• Digital radio receiver
• Driver door module (DDM)
• Driver door switch assembly (DDSA)
• Electronic brake control module (EBCM)
• Electronic suspension control module (ESC)
• Front passenger door module (FPDM)
• Inflatable restraint sensing and diagnostic module (SDM)
• Instrument panel cluster (IPC)
• Instrument panel integration module (IPM)
• HVAC control module - auxiliary
• Left middle door module (LMDM) w/V4U
• Left rear door module (LRDM)
• Memory seat module (MSM) w/A45
• Powertrain control module (PCM)
• Radio
• Rear integration module (RIM)
• Remote control door lock receiver (RCDLR)
• Right middle door module (RMDM) w/V4U
• Right rear door module (RRDM)
• Steering column module w/N37
• Theft deterrent control module
• Window switch - passenger front w/armored car
• Vehicle communication interface module (VCIM)
Your best bet ,take your vehicle to a qualified repair shop.

Nov 17, 2017 | 2004 Cadillac Deville

3 Answers

Hose leaking brake fluid. under drivers side . just put in new brakes and rotors


If the brake calipar was left hanging by the hose instead of being tied up,that puts a strain on the hose and the brake line causing it to crack or break. The hose needs to be replaced, and the brake system bled of air.

Aug 13, 2010 | 2000 Dodge Caravan

1 Answer

I replaced the master cylinder on my car e now i


ok sometimes a cylinder can be turned try this open bleeder cap on front left side then slam on the brake pedal as hard and fast as you can this will sometimes turn it back the right way. if brake fuild comes fling out it worked. when you bleed then use a hose to go on the end of the cap and the other end in a bottle of brake fuild so it cant get air back in the line. good luck

May 05, 2010 | 1996 Geo Prizm

1 Answer

I have a 1987 bmw 535is, I replaced the abs pump,and bled the system, the left front brakes and rear right are not working. only two wheels are braking. how to solve this


normally abs system use two seperate module unit. each module control the front and rear whell by crossside like u said the front left and rear back are disfuntion. maybe ur replacement abs module have prob or trie 2 bled again

Mar 27, 2010 | 1987 BMW 5 Series

3 Answers

!988 k1500 4x4 5.7l brakes


Bleed right rear,left rear, right front, left front in that order to be sure of good bleed but the brake booster makes it easy to push pedal. Make sure of no leaks from master cylinder. Otherwise brake hoses being soft will also hurt baking quickly.

Apr 15, 2009 | 1988 Chevrolet K1500

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