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I HAVE code u0100 GMC SIERRA 2014 LOST communication with ECM and immobilizaer

I check all visual inspection all done

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  • GMC Master
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Modules communicate back and forth on the CAN bus. Code U0100 indicates the PCM is not able to send or receive CAN communication signals. This should be diagnosed by a professional.
Possible causes:

  • A faulty PCM
  • A problem with the control module circuit
  • A problem with the CAN bus

Posted on Dec 07, 2019

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

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Posted on Jan 02, 2017

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Anonymous

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SOURCE: The radio on my GMC Sierra is locked. Does anyone

YOU CAN CALL YOUR LOCAL DEALER, GIVE THEM THE VIN # AND THEY CAN TELL YOU THE CODE AND HOW TO DO IT FOR FREE.. GOOD LUCK KEITH..

Posted on Mar 12, 2009

Boneebone

  • 973 Answers

SOURCE: original color code "burgundy" of 1989 gmc sierra 2500

Use this guide to help you find the color
https://www.duplicolor.com/color_selection.pdf

Posted on May 25, 2010

Testimonial: "Thanks!!! I had checked there, but that part of them sticker is worn off. I should have been more clear. Thanks so much for taking the time to try and help. Have a great night!"

Randy Ohler

  • 14585 Answers

SOURCE: 1994 GMC 1500 Sierra 4.3

The distributor gear. It wears down and causes rough idling to no start. Pull the distributor, look where the rotor button is pointing as it needs to go in the exact same position. you can get just the gear and replace it. it is held in by a drive pin. Push it out and swap gears and reuse the drive pin. hammer it in.

Posted on Aug 17, 2011

cansmo

Reynaldo Andico

  • 2431 Answers

SOURCE: ECM I fuse keeps blowing

For the ECM 1 fuse to open you obviously have a short to ground , start with the injector disconnected and see if ECM 1 fuse still blows.If it does disconnect crank sensor, also inspect wires for the injectors or any rub through wires here is a diagram cansmo_178.gif

Posted on Sep 09, 2011

headstrong56

headstrong56

  • 493 Answers

SOURCE: 1997 gmc sierra 1500 ecm fuse pops when trying to replace

you have a wire grounding out somewhere. The only way I know how to find it quickly is not very safe and requires extra work later.

Posted on Jul 30, 2012

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1 Answer

My 07 mazda6 as four codes u0101,u0155 u0121,u0073,u0100 and stuck in 3rd gear please help


You'll need to get a good auto electrician to look at this. The codes suggest a failed ECU, the brain reading all the engine sensors. If this fails, the car is unusable as the ECU won't let the vehicle work.
Codes read as:
U0073 - Control Module Communication Bus "A" Off
U0100 - Lost Communication With ECM/PCM "A"
U0101 - Lost Communication with TCM
U0121 - Lost Communication With Anti-Lock Brake System
(ABS) Control Module
U0155 - Lost Communication With Instrument Panel
Cluster (IPC) Control Module
I have very little experience with gearboxes so I can't really help with the 3rd gear problem.

May 27, 2018 | Mazda Cars & Trucks

2 Answers

PLS DOES ANYONE KNOW THE MEANING OF THESE CODES AND WHAT I CAN POSSIBLY DO TO SOLVE THEM, U0100 AND U0001


Try these write ups I found. It is too much to reprint and it gives credit to the author.

http://www.troublecodes.net/ucodes/u0001/


http://www.troublecodes.net/ucodes/u0100/

Dec 02, 2017 | Cars & Trucks

1 Answer

How do you fix a U0100 code on a 203 Mazda 6


code u0100 refers to data bus, engine control module(ECM) A --no communication
check all wires and connections
replace the ECM with a know operational unit

Nov 06, 2017 | Mazda Cars & Trucks

3 Answers

What do these codes U0100, U0155, U0101 and P2187 mean for my mazda?


U0100 - Lost Communication with ECM/PCM "A"
U0155 - Lost Communication with Instrument Panel Cluster (IPC) Control Module
U0101 - Lost Communication with TCM
All of them are Geniric Codes 4 Mazda, I would say who ever was working on the car last, posobly forgot or missted 1 or 2 connection
plugs along the way near the last repairs. So just trace yr last steps 2 see if ther any unpluged connectors, cos looks like they all are part of same chane in that line.
P2187 - Sys To Lean at the idle Bank 1
Hope that helpes you. Good luck.
Tony D:-)

Aug 03, 2014 | 2004 Mazda 6

1 Answer

Toyota codes u0100 and u0101


U0100 means lost of communication with ECM/PCM
U0101 means lost of communication with TCM

Feb 24, 2014 | 2007 Toyota Camry

1 Answer

Toyota vx 200series code u0100


that is a very serious comm problem (Im sad for you, scary code)
reset it and see if it comes back other sysptoms, low battery
just finished jumper cable jump starts, or other odd battery issues???
short answer: take it to Toyota.
long:
U1100 is seatbelt controller
U1110
Lost Communication with Clearance Sonar Module i cant find much on U0100, are you very sure that is it?
DTC U0100 Lost Communication with Engine Control Module (ECM)

1: check all fuses. using and ohm meter (restance low range) for 0 ohms.
2: check battery voltage running engine and not.
12.6v key off, 13.3 to 15v running, if not charge system failure.
3: pull battery minus lug for 1hr. and put back, keep in mind you can lose radio codes. or dead radio for lack of radio pw code.

4: re-seat all CAN buss modules in car, 1 by 1one battery minus pulled.
PCM, BCM , all off them. reseat means pull connector to it and put it back.
It might just be a random glitch, that all comms see, all the time on all networks. Unknown, glitch. (CRC failure)

Jan 31, 2014 | 2004 Toyota Land Cruiser

1 Answer

2006 VW Jetta code U0100


This problem is with ecu / ecm= engine control computer. These are a common and horrible problem on vw's, particularly on tdi's. The signs in a tdi are when car dash lights come on, but no glow plug light,trans gear lights flash, but car still tries to crank. And hopefully ecu has enough power to out out code u0100= no communication with ecu. Unfortunately the ecu will need to be replacd. The ecu is located under the hood, near and under the wipers. Used ecu with same codes run $50-200. New $1000. If get used one make sure has a return policy. codes must match production quarterly year.

Apr 14, 2013 | 2006 Volkswagen Jetta

1 Answer

Im looking for the definition to code U0100.


U0100 - Lost Communication With Engine Control Module (ECM)

Jan 30, 2011 | Chevrolet Aveo Cars & Trucks

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