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Transmission limp mode current codes

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Old Nov 15, 2025 | 04:06 PM
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Ronks2's Avatar
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From: Concord, NH
Default Transmission limp mode current codes

Error codes That were current as of the last pull

The car is stuck 1200 miles from home, which is why I post only now and then.
On cold morning it shifts and runs fine. After the car warms up all the usually lights, traction, brake ABS and red exclamation are thrown and i am stuck in third gear again. I have head of another case like this, and the guy threw the TCM in the freezer, reinstalled and it worked fine until warm again.

C1440 Pressure Transducer Main Primary Signal faulted
U1900 CAN communication bus fault
P1799 CAN transmission control module ABS control module circuit malfunction
P1582 Flight recorder
0x2a01 face outlet control stepper motor open circuit or short circuit to battery
0x2a04 face outlet stepper motor line interruption
P1000 system check
This code popped up the day the car went into limp mode, three months before above codes
P1637 CAN link engine control module/ABS control module circuit network malfunction

I have the used TCM i will try and install next week.

Thanks again,,
Ron

 
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Old Dec 22, 2025 | 10:14 AM
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I have tried two different TCM. I have matched the codes so closely that on one of the replacements, the only digits that didn't match were the last tow out of the 20 or so on it.

The other one, rolled off the assembly line about two months after mine
 
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