Code P2789? TCM is not working?

BHAMDOC1973

MEMBER
2010 AUDI A4
4 CYL
TURBO
2WD
AUTOMATIC
132,000 MILES

Any recommendations or suggestions on this one? Any TSB?

Thursday, September 29th, 2022 AT 11:17 AM

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,526 POSTS

Let's try this again, the code P2789 in the manual indicates the TCM is not working. Here is how they say to fix it in the images below. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem.

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Friday, September 30th, 2022 AT 12:37 PM

BHAMDOC1973

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1,557 POSTS

I bought the car. It drives, engine smooth but has these codes and no check engine light. Deleted the codes only one back for now is p1575. Would any of these affect throttle for someone to think transmission is not responding? Because I am looking for that first transmission code I sent you and it's not there.

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Monday, October 10th, 2022 AT 1:46 PM

BHAMDOC1973

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Also, just drive it drives good came back and scanned it and it has p1741.

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Monday, October 10th, 2022 AT 1:48 PM

BHAMDOC1973

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Also, this is a 2wd not the 4wd.

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Monday, October 10th, 2022 AT 5:24 PM

KEN L

MASTER CERTIFIED MECHANIC
47,526 POSTS

These cars are very temperamental so the transmission can be affected.

P1741 code is Torque Converter Clutch Solenoid harness is open or shorted, so this is a transmission related code as well which can be the TCM.

Here are the transmission control module wiring diagrams for the different transmissions. I would turn the key one and check the fuses in the diagrams for power. Let me know what you come up with.

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