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Cannot ''wake up'' ECU

Cannot ''wake up '' the ECU to read codes, getting ''cannot connect to ECU BUS INIT error'' Scanning gear works on other cars.

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Scanners dont always work on all korea made so generic systems may only read "made in usa"cars.have the same problem over here in uk......

Posted on Jul 11, 2010


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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

1999. What are the probable causes of DTC P1624?

Definition of Diagnostic Trouble Code P1623 Audi: Data Bus Powertrain No Communication BMW: Pedal Position Sensor Potentiometer Supply Buick: Transmission Temp Pull-Up Resistor Cadillac: Transmission Temp Pull-Up Resistor Chevrolet: Transmission Temp Pull-Up Resistor Chrysler: ASD Relay/Control De-Energize Too Soon Dodge: ASD Relay/Control De-Energize Too Soon Ford: Code word/id number-write/read error GMC: Transmission Temp Pull-Up Resistor Hyundai: Diagnostic Lamp Powerstage Malfunction Jeep: ASD Relay/Control De-Energize Too Soon Land Rover: Immobilisation ECU code storage fault.Last occurrence - signal fault Lincoln: Code word/id number-write/read error Mazda: Immobilizer Code Word/ID Number Write Failure Mercury: Code word/id number-write/read error Oldsmobile: Transmission Temp Pull-Up Resistor Pontiac: Transmission Temp Pull-Up Resistor Saturn: Transmission Temp Pull-Up Resistor Volkswagen: Data Bus Powertrain No Communication Volvo: ETS .amp / MIL on

Jun 27, 2015 | Hyundai Elantra Cars & Trucks

2 Answers

Loss speedometer and tackmoter in my 2005 jeep grand Cherokee what could it be odemeter still works

the cluster in the the car, is standalone,
its just a display and has self test you can do.

Check both cluster fuses in the fuse box yet?
one is power other is memory.

if that test passes, and you
THEN PCM, did you scan it yet? (any modern $10 scan tool works here) can-bus rated, scan tools are Ubiquious now.
not scanning the car, and missing can-bus errors is bad idea.
or missing PCM can't talk to the display(cluster) misses the boat.
or VSS errors, or any TCM errors, or other errors, DO SAY THEM.

the PCM sees RPM or the engine can't run , with dead cam or crank sensors. so right off the bat I know PCM is sending RPM .(tacho)

the speed can be checked with any scan tool made (rpm /speed)
plug in scan tool and drive, and have helper read the PID called, SPEED . (vss speed) cheap tools can do live data stream.
on ANY PID. (pids are live parameters by number)

do not guess. here, scan it first.
or go broke.

Feb 27, 2015 | 2005 Jeep Grand Cherokee

1 Answer

I have a 2002 toyota prius that will not start only code is p3030 what can I do to fix this I have cleard the code and as soon as I trun the key on it pops right back up

Error Code: P3030
Description: Disconnection between battery and ECU.

The battery ECU monitors a voltage of the battery blocks to detect an open malfunction in internal battery voltage sensor circuits of the battery ECU and the wire harness between each battery block and battery ECU. If a voltage at one of the battery blocks is below a standard level or of all the battery blocks is within a specified range, the battery ECU judges that there is an open in the internal sensor circuit(s) or wire harness. The battery ECU then illuminates the MIL and sets a DTC (Diagnostic Trouble Code).
Trouble Area:
- Junction Block Assembly (Bus Bar Module).
- Frame wire number 2, (Bus Bar and wire harness).
- Battery ECU.

Aug 09, 2014 | 2002 Toyota Prius

1 Answer


no FSM? no account?
and all fuses checked first , right? all tested, not glanced only.
both dead on all 4 corners, that is no lights glow , non stuck on. right?
dead turnsignals, blinkers and emerg.
The signals are controlled by the BCM and the noise is basically just a courtesy to let you know the signals are on.
so do you get that sound? yes or no (its just the BCM telling you ,
i got the blink command)
if no sound, (call it a tell tale) then the BCM didnt get the command
scan it.

so I will look (programming what do you mean by that????)
you have a factory programmer?CONSULT-II ??????
i dont have the schematic for this year.
many cars starting in 2006 switched to can-bus (this car)
and lots of computers, mine has 11.
and works like this.
the combo switch closes. (just a binary digital signal 0 or 1) TO THE
BCM. (very rare failure here,as no large current flows,like old cars)
the BCM sees THAT, and sends a command to the multifunction module via the CAN-BUS. this unit closes relays and does the blinking
all in software. (in the IPDM) the IPDM has RECALLS !!!

134 TSBs, wow.
always read the TSB first. ,
yes, complex. but that is now new cars work.
facts your car does have a BCM.
car has throttle by wire too, and that can sux.

so my points?
not checking all fuses.
not scanning this modern fancy car with a real scan tool means
you missed all those factory DTC codes
like lost the code from BCM to other master device?
it the can-bus fails, it will report it and other errors.
even stuck, blinker relay or?
i use a innova scan tool model 3160 to SEE all FACTORY CODES
this is first after fuses tested. (tested not glanced)
i found the 07 IPDM on google

headlights inoperative.
Radiator fan inoperative
Fog lamps inoperative
Wiper inoperative
no mention of TURNS.
NTB03-094??? cant find it but is blink related (rumors)

my guess.?
bad fuse.
the stalk switch is good, take 2 switches to fail, unlikely
bad programming in BCM.
scan it and look for CAN-buss errors.
or it will be impossible to diagnose.
unplug car neg battery lug, wait 5min, and put back.
this might make the BCM and friends, wake up.

Jul 09, 2014 | 2006 Nissan Murano

1 Answer

2001 buick century runs fine when in park and nutral i can put it in drive and sometime i can go 10k sometimes only get 1k the it starts spudering and wont rev up but will idle fine put it in nutral and...

I think you have an engine speed sensor fault. its not reading the engine speed or the motion speed. needs these two to change speed and ( gear). one is connected to the abs unit and the other is on the engine. usually if they both go its down to the gear box ecu. you can check if you have it on a ecu reader. will have fault codes or not be read at all.

Mar 16, 2014 | 2001 Buick Century

1 Answer

My kk jeep 2008 cluster is not working the left screen giving error the other giving horizontal light lines no all dashes are off all staring wheel functions are off too

check fuses.
try to reset , some of these clusters have a hot all time pin.
so pull all cluster fuses, 2 min. and put back. see if it wakes up
NO? then pull it and reseat all connectors to it and on it.
if not ,working, its probably bad.
but you never scanned it, missing all those errors to it.
the cluster is like your computer monitor now but uses the CAN-BUS
network in car. (or LIN bus) and if the comms are down to
PCM or BCM,. the cluster may go nuts.

not scanning it ,misses the boat., all car , today must be scanned.
i use an INNOVA 3160, that sees ALL jeep codes.
B codes, U codes, all codes.
read the FSM and see all those 1000 of codes , some even show
comm's to cluster DOWN. or corrupted.
that be it. for 07 newer jeeps.

Aug 11, 2013 | 2008 Jeep Liberty

1 Answer

Volvo xc90, warning comes up ''engine service required'' then loss of power until warning goes off.


The loss of power can be caused by a big number of different fault. A code reading would be a good first step to troubleshoot the fault.

If the check engine light comes on, then engine faults have been detected and related codes have been stored in the vehicle's computer modules. Primary DTC (trouble codes) are stored in the main computer (called ECU). Such codes can be read using an OBDII code reader connected to the socket under the dash. Here a code reader: U480 Can Bus.

A code scanning can also be performed at the dealer place or at any garage. In US it can be done for free at the nearest Autozone.

If there is no indicative codes also test the fuel pump and pressure regulator by reading fuel pressure with a gauge connected to the port on the fuel rail. Here the tool: Wilmar W80594.



Oct 22, 2011 | 2003 Volvo XC90

1 Answer

My 2007 dodge nitro has an error code "no bus" how do i fix it?

well :no bus: means that the infomation panell is not getting a signal check the harness below the odometer. I guess the car is running fine, if not then its the ecu itself.

Oct 01, 2010 | 2007 Dodge Nitro R/T New Cars

1 Answer

2001 Dodge Ram, 3500, CTD 5.9, AT, 2WD, No Bus

No bus error code has nothing to do with your fuse panel this is a ECM /ECU error code... sorry but get ready to spend some money for a new ECM

Sep 13, 2009 | 2001 Dodge Ram 3500 Truck

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