Uo 101 lost communication with tcm

Question moved from Computer category to model category.

IDO or IOD?
combus or Can Bus?

https://www.google.com/search?q=2012+Nissan+Titan+IDO+fuse

U0101 - OBD II Trouble Code: Lost Communication with TCM

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Code U0101 stands for Lost Communication with TCM. The transmission control module (TCM) is the computer that controls your vehicle's transmission.

U0101 Code: Lost Communication with TCM

CarParts.com https://www.carparts.com > ... > OBD-II Trouble Codes
Sep 28, 2023 - DTC U0101 stands for "Lost Communication with TCM." DTC U010 is set when the transmission control module is unable to receive or send ...

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.

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 (OnStar®)
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 .

Leave this to the experts, very complicated testing with a special electronic scan tool must be done.

If it was running fine before, I wouldn't worry about the U code. U codes can be caused by changing the battery. Your water and oil mix needs fixed. Intake or head gasket is blown.

communication failure on CAN-Bus.
take it to the shop.
as in all cases, electrical
check all fuses first.
reseat the connectors to the transmission.
FSM
Trouble Code: u0073 Control Module Communication Bus Off
Trouble Code Conditions:
TCM fails to transmit and receive the data via CAN for specified time continuously.
Possible Causes:

• TCM
• circuits
• ECM

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

These codes are communications code errors:

The UO101 is a transmission communication error: poor communication to your transmission ECM / computer

The UO105 is a fuel injection communication error: Poor communication to your fuel injector ECM/ computer.

no year stated, are you kidding?
good luck fixing this. not at dealer, or a real ASE shop.
wow, 2, does car run perfectly, gee, that be #1 right?

can bus errors.
what you can do is.:

1. test all fuses.
2. charge car battery up to 12.6vdc rested, !!!
3. clear them all with scan tool do they come back? yes?/no?
4. unplug battery for 1 hours, (neg lug off only) and put back
5. fixed?
6. unplug all modules (up to 11) 1 by one, battery unplugged. and see that connector looks clean, and put it back.
7. or unplug one , see if some errors clear. and only module unplugged is now in error,
8. The can-buss is shared highway, and has 1 lane. so if one module takes a dump on it, the others cant talk on said bus.
9. That means its hard to find, unless you take a class in CAN-BUS 101. how to diagnose it.
10. go to a real shop with ASE badge on sleeve and gray side burns, and win, a real mech, wont make excuses but In fact most shop do not have the powerful scan tool jeep has. not nearly. Find a shop that can diagnose CAN-BUS, if they go , what's that, MOVE ON !

The code P1698 is: No CCD messages from TCM. That means the communication between the Transmission Control Module and the Power Control Module is lost. Sometimes this happens when a PCM, or TCM is replaced without being flashed, a bad connection at the PCM, TCM, or a bad TCM. Hope this helps.