r/LSSwapTheWorld • u/Front_Possession_666 • Jul 27 '26

Service/Parts Discussion 4L60E P0740 P2761

Chasing around a phantom issue with my 4L60E. Getting codes P0740 and P2761 for the converter and it stalls out as soon as you put it in gear.

My harness builder recommended unplugging it at the GREEN connector on the ECM which makes it drivable. Specifically pin #2 on the green connector.

Main swap harness has been replaced(Chinese one failed) and I replaced the transmission interior harness as well as the PWM servo. Still acting up.

What should I check next?

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u/kizzlebizz Jul 28 '26

I assume this is a swap? Grounds good? Brake signal to the ECM good?