Lifetime Premium Member
2009 Avalanche White ❌terra OR
Join Date: Jan 2016
The IPDM self test that does the lights and fan? I don't think that helps you know if it isn't sending good power to the ecm, tcm, bcm, etc. Getting U1000 in the transmission controller, abs controller, transfer case controller, or others is a good clue that the IPDM isn't keeping them happy. The dash controller is called "meter" on my scanner.
The voltage depends on the charging cycle. Mine shows 14.1v when charging and 13.3-13.5 when not. A bad ground connection at the battery or frame can mess with the current sensor, and that ties into the alternator's voltage regulator somehow. Have you checked the bottom end of the ground cable yet?
An IPDM swap is plug-in easy. All the connections are unique shapes and only fit into the right things. It does help to have needle nose pliers or a blunt screwdriver to help with the lock tabs if you don't have small fingers. You'll want the new cover too, I think it's a bit bigger and also has the correct new fuse and relay labels.
Sometimes a very dead battery or very corroded connection will give similar troubles. It's up to you if you want to keep hunting or risk the $50-300 on the updated IPDM. (I've had good luck with junk yard pulls for cheap, just make sure it's the B or C version.) Your call.
If you want to improve, be content to be thought foolish and stupid -
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