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04 deville ck eng light..no communication with DLC


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P0442 = Evap system leak.

P0741 = Torque converter clutch.

What are you using to try to pull codes from the DLC?

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There needs to be both a power and ground at the DLC for a tool to work...something going on there...

On the IPC mode....the IPC will display all the systems codes....then will ask..."clear all codes?"....use the (up) ^ button as a yes. The display should then show.."all codes cleared". Then just turn off the car.

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