C5 LDCM Comm Failure
Thread Starter
Heel & Toe
Joined: Jun 2010
Posts: 16
Likes: 5
From: Rockville, MD
C5 LDCM Comm Failure
I just took out my weekend 2000 C5 with 60K miles. Had not driven it in four weeks. Battery must have been a little weak. She started no problem, but threw a P1160, and reported on the DIC a LDCM Comm failure and my drivers side window and locks were suddenly now dead. Passenger side worked fine.
I pulled over and killed the engine. Opened the drivers door and slammed it closed a few times. Restarted it and the codes cleared. Probably a weak battery.
Gonna put my baby on a battery tender......
I pulled over and killed the engine. Opened the drivers door and slammed it closed a few times. Restarted it and the codes cleared. Probably a weak battery.
Gonna put my baby on a battery tender......
Melting Slicks
Joined: Jan 2009
Posts: 3,275
Likes: 739
From: Miami FL
The female pins of the connector on that wire harness get deformed, causing bad contacts and isolating the door control module. In addition to that, this could also cause a loss of communication/corruption in the Serial Data Bus affecting all modules linked by it (this would explain all additional codes, if any).
Check the connectors in both doors for deformed pins. If bad pins are found you would need to repair the connector (NOTE: disconnect battery first!), fixing the female pins so they have a positive grip, or replace it. If you want to replace the connector take a look at this post for some ideas.
If connectors are fine, then the problem could be downstream the connector up to the door control module, but usually it's bad contacts in the connector.
Last edited by GCG; Sep 22, 2019 at 06:26 PM.
