Question about 2005 Mazda 6

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Mazda 6 2005 u0101,u0155,u0121,u0073,u0100 codes coming up

Just got the car 3 weeks ago ,already had the coil replaced and car was running great .turned the car on 3 days after they fix it and every light came on the dash ,at ,battier, traction control ,brake light, and abs lights plus the rpm gage, mph and the temp gage all don't work the car goes into gear hard and doesn't shift out of 3rd.dont know were to start to fix it read some were to take the battier out and put the positive and negative wires together to reset the codes and see if they come bake on but I don't want to mess anything up.

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I got the same problem. u ever figure it out? ive cleared codes and there the same. light on cluster lit up . plus some time after pulln away from stop car goes five mph. turn off start up drives fine. im about to burn this thing.

Posted on Nov 29, 2015

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Posted on Jan 02, 2017

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SOURCE: Awhile ago I removed the possitive wire cable of

WELL REMOVING THE POSITIVE BATTERY CABLE FIRST WILL DAMAGE PCM,TCM,BCM,AND THE ALTERNATOR, YOU SUPPOSE TO REMOVE NEGATIVE BATTERY FIRST ALL WAYS NEVER REMOVE POSITIVE BATTERY CABLE IF DO YOU WILL DAMAGE THE ECM AND ELECTRICAL SYSTEM.

Posted on Jul 30, 2011

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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 | Cars & Trucks

1 Answer

Where is the hdm module on 2006 monte carlo ltz


HDM module ??????? No such module .
DTC U0100 00: Lost Communication With Engine/Powertrain Control Module (ECM/PCM)
DTC U0101 00: Lost Communication With Transmission Control Module (TCM)
DTC U0121 00: Lost Communication With Electronic Brake Control Module (EBCM)
DTC U0140 00: Lost Communication With Body Control Module (BCM)
DTC U0151 00: Lost Communication With Restraints Control Module
DTC U0155 00: Lost Communication With Instrument Panel Cluster (IPC) Control Module
DTC U0164 00: Lost Communication With HVAC Control Module
DTC U0168 00: Lost Communication With Vehicle Theft Deterrent (VTD) Control Module
DTC U0170 00: Lost Communication With Passenger Presence System (PPS)
DTC U0184 00: Lost Communication With Radio
DTC U0186 00: Lost Communication With Audio Amplifier
DTC U0194 00: Lost Communication With Digital Radio Receiver (DRR)
DTC U0198 00: Lost Communication With Communication Interface Module (OnStarĀ®)
DTC U0209 00: Lost Communication With Heated Seat Module (HSM)
DTC U0214 00: Lost Communication With Remote Function Actuation (RFA)

These are all the modules onyour vehicle - no hdm module .

Oct 13, 2017 | Cars & Trucks

1 Answer

2005 Mazda 6 4cylinder codes u0101 & u0155


Common problem with several causes including bad ground wire or bad tcm/pcm. Highly recommend you check one of the many mazda forums for specific details

Aug 28, 2016 | Mazda Cars & Trucks

1 Answer

What should i look for when getting engine codes u0121,u0101,u0155,u0073,u0100. plus all lights on clusters on. some times car only goes 5mph till i shut off and restart.


All these " U " codes are communication issues amongst modules. These modules communicate on bus wiring from one to another. You have a communication issue with one or more modules. You will most likely have to have the vehicle proffessionaly scanned with a vehicle scan tool to be able to identify the source of this communication issue. You may have a bad module/wiring/power/ground issue to be repaired

Nov 29, 2015 | Cars & Trucks

1 Answer

How to fix code U0155 for 06 Ford f350


Gas or diesel ?
U0155 - Lost Communication With Instrument Panel Cluster Control Module Description: Missing message concerns are logged by a module upon failure to receive a message from another module within a defined retry period. Possible Causes:
  • Open VPWR circuit to the sending module
  • Open GND circuit to the sending module
  • Open network circuits to the sending module
Diagnostic Aids: Carry out the diagnostics for the associated network module. Application Key On Engine Off Key On Engine Running Continuous Memory All Refer to the Workshop Manual Section 413-01, Instrument Cluster. Do you have a scan tool that can talk to the I/P cluster ?
  • The instrument cluster does not respond to the diagnostic tool
  • Circuit or connection in the controller area network (CAN)
  • Instrument cluster
  • Go To Pinpoint Test H .

May 12, 2015 | Ford 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

I have a 2005 Mazda 6 S 6 cylinder automatic. It started to shift hard and jerk a couple months ago and just recently got worse. A couple days ago it jerked when I accelerated as usual, but kept jerking...


A U Code means a module is not communicating. A technician needs to find out what module is not communicating and make sure it is getting power, ground and can communicate, If any one is missing it may be in the wiring. If all are present the module is bad.
A scan tool will help in this process.

Dec 01, 2013 | 2005 Mazda 6

1 Answer

2004 Maxda RX8 codes U0101 & U0155


These are transmission control module can communications codes. ealer will need to repair these for sure.

Sep 10, 2012 | 2004 Mazda RX-8

1 Answer

Emission test found some trouble codes


U0121 Communication error to ABS HU/CM

Apr 06, 2009 | 2005 Mazda 6

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