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Jerry Newton
Jerry Newton, Chevy Technician
Category: Chevy
Satisfied Customers: 4413
Experience:  ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
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U0001 code trans not shifting. Stays in 3rd gear shift into

Customer Question

U0001 code trans not shifting. Stays in 3rd gear shift into cater stuck on 1st gear
JA: Tell me a bit more about what's going on so he can help you best.
Customer: No communication with TCM
JA: Are you hoping to fix this yourself?
Customer: Yes I worked at a GM dealer for 30 years before opening my own shop
JA: Great! What have you tried so far?
Customer: Replaced TCM module with no results
JA: Is there anything else the Chevy Mechanic should be aware of about your Chevy?
Customer: Put old module back in does the same thing
JA: Our top Chevy Mechanic is ready to take your case. Just pay the $5 fully refundable deposit and I'll fill the Chevy Mechanic in on everything we've discussed. You can go back and forth with the Chevy Mechanic until you're 100% satisfied. We guarantee it.
Submitted: 8 months ago.
Category: Chevy
Expert:  Pete replied 8 months ago.

Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.

Have you checked for any shorted wiring to the TCM to see if there was any wiring issues at all or connection issues causing this here?

Let me know,thanks Pete.

Customer: replied 8 months ago.
Yea I'm still looking don't see anything yet
Expert:  Pete replied 8 months ago.

What year,model and engine?

Customer: replied 8 months ago.
2006 Chevy SSR 6.0 litre
Expert:  Pete replied 8 months ago.

Can you verify the fault code number as I do not show a U0001?

Customer: replied 8 months ago.
in a few I'm talking to a customer. Sorry
Expert:  Pete replied 8 months ago.

No problem

Customer: replied 8 months ago.
Its defenetly U0001high speed can communication bus and U0101 lost communication with TCM
Expert:  Pete replied 8 months ago.

O.k.,unfortunately my info is not listing the U0001 code.

I will open your question up for others here to see if someone else can assist further on this as there may be others here that may have more info on what to check or do with this issue.I hope you can get this resolved with ease.No need to reply to my last post here unless it is a last resort as it will keep your question locked to me and others will not be able to view it.If you feel you want to continue to work with me on this feel free to reply at any time but keep in mind in some cases it can be difficult to fully diagnose or help repair this without seeing your vehicle.

Thanks Pete

Expert:  Jerry Newton replied 8 months ago.

I am very familiar with 2006 SSR, and I can help you out with this.

Which module is setting U0001?

Customer: replied 8 months ago.
Looks like TCM
Expert:  Jerry Newton replied 8 months ago.

But you have no communication with TCM? Can you read TCM data?

Customer: replied 8 months ago.
No it won't communicate
Expert:  Jerry Newton replied 8 months ago.

OK, so apparently the TCM is not working. Have you verified power and ground circuits to the TCM yet? I can provide a schematic, if you need it.

Customer: replied 8 months ago.
Please send diagram. Already put new TCM in vehicle. Same result
Expert:  Jerry Newton replied 8 months ago.

Did you program TCM? I assume you know that a replacement TCM needs to be programmed to the vehicle, but just making sure.

Pins 11, 31, and 32 should have power on them. The TCM also needs to be grounded to the chassis, make sure it's not just hanging loose during testing. I am attaching a pinout for the connector.

Customer: replied 8 months ago.
I'll look at connector. Thank you. Shift indicator is staying in 1st gear position no matter where shifter is at
Expert:  Jerry Newton replied 8 months ago.

TCM supplies PRNDL information on the data bus, so that's not surprising. If you get the TCM working, these problems will likely all disappear.

Customer: replied 8 months ago.
Ok thank you
Expert:  Jerry Newton replied 8 months ago.

Sure, let me know how you progress.

Customer: replied 8 months ago.
I will
Expert:  Jerry Newton replied 8 months ago.

.

Expert:  Jerry Newton replied 8 months ago.

Did you get this worked out? Wanted to follow up and make sure you got what you needed from me.

Please remember to rate my answers, that's how I get compensated.