MAZDA PREMACY ERROR CODES U0101, U0100, U2064

[kutswa]

Dear All,

Please assist to advise how I can resolve the above trouble codes or the steps that I need to resolve. I have below logs and need assitance.

===TCM DTC None===
Successfull DTC reading, no error codes found

Module: Transmission Control Module

===END TCM DTC None===

===PCM DTC U0101-FF===
Code: U0101 - Lost Communication With The TCM

Module: Powertrain Control Module

===END PCM DTC U0101-FF===

===OBDII DTC U0101-C===
Code: U0101 - Lost Communication With The TCM

Status:
- Confirmed - malfunction is confirmed

Module: On Board Diagnostic II

===END OBDII DTC U0101-C===

===ABS DTC None===
Successfull DTC reading, no error codes found

Module: Anti-Lock Brake / Traction Control Module

===END ABS DTC None===

===EPS DTC None===
Successfull DTC reading, no error codes found

Module: Electronic-Controlled Power Steering

===END EPS DTC None===

===IC DTC U0100-FF===
Code: U0100 - Missing the CAN message from the PCM.

Module: Instrument Cluster

===END IC DTC U0100-FF===

===IC DTC U2064-FF===
Code: U2064 - Warning Indicator Requested by Another Control Module

Module: Instrument Cluster

Diagnostic Trouble Code details

This DTC refers to the warning light illumination request signal from other modules, not malfunctions of the instrument cluster itself.



This DTC may not be deleted while the engine is running.
To avoid this, follow the procedures below

Turn the ignition to the OFF position.

Turn ignition to the ON position.

Read continuous codes



Check which unit is malfunctioning according to

Freeze Frame Data

Electrical > IC Service Function > Freeze Frame Data

===END IC DTC U2064-FF===

===RCM DTC None===
Successfull DTC reading, no error codes found

Module: Restraint Control Module

===END RCM DTC None===

[FORScan]

Uxxxx codes are network codes and considered not critical. If there are no other fault symptomps (like non-working functions, a fault indicator light etc), there is no serious reason to concern.

Specificially, codes U0101, U0100 may be caused by work of diagnostic equipment (in this case FORScan and ELM327), because modules exchange information using the same CAN bus testers use for diagnostic. The diagnostic operations may affect normal module communication in some cases, in this case the DTCs U0xxx are thrown.

As for the U2064, didn't you try to use Output control function in FORScan right before ? Otherwise, it is an weird error, we don't know what it may mean.

Unfortunately Freeze frame is not supported for this model yet, so you cannot get the FF data

[kutswa]

Thanks for the feedback.

These Errors come at times and disappear on there own.

This is how the car behaves.
when I start the car while engine is running. AT light and the P (Parking Light) blinks after which the check engine light comes on. During this blinking the car idling goes down to 1.1 rpm then goes backup to 1.5 rpm. This continues for about 5 min in which once the can engine is warm the AT light goes of and the check engine light remains on through out. During this time the car moves smoothly an all gears work in AT/MT mode.

I have changed the gearbox oil.

At times this error my not come like for 2 days but will apprear later.

Could it be wiring problem. or TCM or communication between PCM & TCM

[FORScan]

Yes, it sounds like a communcation problem between PCM and TCM (poor contact). On your place we would try to ( ideally to find an electrical scheme first) check all connectors and connections between PCM, TCM and IC for water, corrosion, mechanical problems etc. Another idea is to try to find a service manual that may have a pinpoint test for these DTCs.

[kutswa]

Thanks for the feedback.

Please suggest best way I can use this software to troubleshoot CANBUS.

[FORScan]

We provided an advice in previous post. Also, you may use self-tests functionality in FORScan, there is a chance more information can be extracted about this problem. We don't see how else FORScan can assist you in this specific case. Both TCM and PCM modules are available for diagnostic, it means the CAN bus works. Although it would be good to acknowledge the electrical scheme to find out how PCM and TCM are connected with each other.