U0101 Chevrolet Code - Lost Communication With Transmission Control Module

I have a208 Chevy. Aveo engine lite stays on,shows code u0101-u0100, have had it in 4 shops, no luck light is still on what can you sugest. Ben.

Any other codes or symptoms? according to the factory service manual, you may either have a problem with the Engine Control Module (ECM) or Transmission Control Module (TCM)

2007 Malibu, u0101, c0000, no comm to tcm or ps modules, power steering on radio message, no speedo, 2nd gear only, it's not power or ground to tcm, it's not the output speed sensor, car still starts runs drives

Check for any other Powertrain Control Module (PCM) codes (e.g. Pxxxx) , if no other codes are present, then there is a problem with either the Power Steering Control Module (PSCM) or the wire from the PCM to the PSCM.

C0000 CHEVROLET - Vehicle Speed Information Circuit

Read more: http://www.autocodes.com/c0...

2011 Impala 3.5.
The usual GM traction control/abs/stabilitrak/brake assist lights.
Hesitation when turning left from a stop, traction control cuts in and the lamp flashes. Periodically, I will get the "Service Stabilitrak, Service Brake Assist, Service Traction Control" all at the same time, and they go away after a minute or two.
I've had it scanned while driving, and it produces the 3 codes you see in this picture.
Any idea how to solve it? Or should I just run with the traction control off all the time like I have been for a year?

Unfortunately lost communication codes are very difficult to diagnose, could be the PCM, TCM or the harness. Sometimes the problem is the PCM or TCM connector, with time the connector gets loose or poor connection develops in the pin. I suggest disconnect and reconnect PCM, clear the codes and drive it.

2013 Chevy Impala LT 3.6
U0101 code , service stabiltrak light came on. PRNDL on dash had no circle around letter indicating what gear it was in. Drove the car to the mechanic shop and they replaced and programmed a new TCM. A few days of driving fine and on day 3 , all the symptoms came back. Any idea on what else it could be ?

The U0101 code means that at some point the PCM lost the communication with the TCM. If you have already replaced and reprogrammed the TCM and the code came back, then the next step is to check the wires from the TCM to the PCM. Make sure you check the TCM connectors pins, there are several bulletins for other Chevy vehicles with the same problem, and the factory recommends checking the TCM connectors for loose pins.

2013 Chevy Sonic 1.8 liter, codes u0101, po597, po598, po171, I want to fix The transmission code before I get to the other ones. The car shift into gear reverse neutral and drive very violently. It will only go to 40 mph and I don’t think it switches gears. Motor mount looks good but has some give to it, TCM fuse has power, I do not see any burned wires,

There is a factory service bulletin for some Chevrolet models with U0101 code, the factory recommends that prior to any parts replaced there are several areas that should be inspected:
- One area is the transmission connector pins, for damaged terminals or poor terminal fit.
- Another area is the under hood fuse block for damaged terminals or poor terminal fit and mispositioned fuses in fuse block.
- Another area to inspect would be the TCM ground.
- As always powers and ground should always be load checked to make sure the circuits are able to work properly.
- Another common area would be to check the harness for rubbing through on any sharp objects mainly on top of transmission where harness can contact sharp area on engine block.

Found the problem! TCM wire had a short in it. Bypass the wire and shifts perfect. Hesitated at first shifting for a few miles but I think it relearned itself. Thank you sir.

I'm glad you fixed the problem. Thanks for sharing!!

So a month ago I brought a 2013 Chevy Impala LTZ the dealer had just put a new engine in it. So it was driving good for two weeks I was going on a trip wanted to look at the oil and transmission oil and I seen a little screwdriver so I pulled it out when I went to start the car it didn’t show the light indicating what gear it was in around the P,R,N,D and it shift hard and had no power and it was saying that it lost connection to the transmission control modul. So I guess the screwdriver was there pushing up the wiring plug to give it better contact. So do I have to change the wiring Hardness Plug that plugs in to the tcm?

Do you have a picture of where the screwdriver was or the screwdriver? perhaps, the connector is only missing the part that holds down the connector

Yes I have a picture

Thanks for responding. I tried posting a picture It won’t let me send the picture on here. If you can email me at Gsacrasfinest916 @gmail.com I will send you the picture.

It happened with my Malibu 2015 LS also there’s no P, D,N,R, in the display also I see the
yellow light [P) like this

So I had to replace the Trassmistion control module that cost me $600 plus to program it another $150 and a friend that did the job only charged me $150

Thank you for sharing!

it gives me additional headache! the expenses that needs to be paid.. no choice otherwise you cant use your car.

At first I thought since I pulled the screwdriver out from the wiring plug that connected to the tcm that it was the problem so before I spent $750 total on replacing the tcm and programming it I had my friend mechanic look at the wire if connector and it wasn’t it so I think it’s going to be your wiring connector that plugs in to your tcm that’s probably what it was and not your tcm

No problem it was my pleasure

I had a problem with 2007 2500HD diesel where i had to replace the power steering pump and when I hooked up the second battery I guess something in the alternator shorted and burned the alternator output wire in two. It also shorted the starter solenoid coil. After replacing alternator and starter, hooked up batteries and started the truck, when I put it into gear it shook violently and would not move. Put back in park . Scanner said dtc U0101 tcm not communicating. Dash said ABS failure and fix brakes immediately. Got on internet and tried to figure the problem. Got to thinking probably should start checking fuses and found TCMB 10 amp fuse blown. Replaced fuse. Everything fine now. Sometimes it is something very simple.

Thank you for sharing!!!