Re: 6L80 transmission rebuild, relearn, & TCC wiring
The tcm sees 3 brake signals. 2 from the bcm and one from the ecm. The only 1 of concern is from the ecu. The ecu will need 12 volts with brakes applied. This is critical. If your trans does not shift or go in gear you have a transmssion issue. When you have a mismatch it will stay in first gear
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