My ‘02 Z06 has an intermittent electrical issue I hope someone may have an idea what might be going on. I came out from the store and started it up I noticed the DS power window didn’t work. Also the security light was on. The PS power window worked but not for long. All the power in both doors was gone. I saw the message service active handling and service ABS system alternating on the DIC. Also the yellow icons for those were lit. I started driving home the check gauges came on everything on the dash went dead including the radio. The reduced engine power also came on although the car seemed to run fine. During the next 45 minutes or so driving home one by one the issues went away pretty much in the reverse order of how they came on. The last thing to start working again was the power windows. Just as I got home everything was back to normal. I checked the codes and came up with the following:

28TCS - U1301 H, C1214 H

40PCM - U1255 H, U1096 H, U1016 H

60IPC - U1255 H, U1016 H, U1064 H, U1040 H, U1088 H, U1176 H

80RADIO - U1064 H, U1016 H, U1096 H

99HVAC - U1064 H, U1096 H, U1160 H, U1255 H

10PCM - P1626 H

40BCM - U1016 H, U1096 H, U1255 H

A1RDCM - U1064H

A6SCM - U1300 H, U1255 H, U1016 H, U1064 H

BORFA - U1016 H, U1255 H, U1096 H

58SDM - B0026 H, U1301 H, U1096 H

None of the codes show they were current. No lights are on and the car runs great. I have read many of the posts on this forum about the importance of checking and cleaning the grounds. Is there anything else specifically to look at. Of the 13 ground connectors, is it possible to narrow down which ones which would cause these problems? Any advice would be greatly appreciated.

 

I would check the black electrical connector in the door accordion for terminals that are loose. You can bend them back into shape or try to replace. I had the same problem. It's very common.

 

You have a bunch of “U” communication DTC’s there…with these you may have a no start or start and stall, power windows not working, you’ll see a bunch of messages scrolling through on the DIC…when you notice this craziness going on shake the “rubber boot” you see when you open up the driver door…may be a bad power or ground on the driver door module…this may happen on any of the cars modules but seen frequently on the DDM.

 

I get the same thing every now and then with my window and have to open up the door to jiggle accordion boot to get it to work again. I have CEL for known issues but many still pop up as H codes even though I've never had issues with problems listed

 

Where are the connections when you pull the boot out don’t want to get into trouble if there hard to get to.
Thanks