I changed out the main drivers door module on my 03 gmc yukon slt 5.3 and ever since then I have had a bad battery drainage problem. I changed the battery and the altenator and it is still draining. When I do charge it enough to drive it shuts off every time I stop. I tried to hook it up to a computer to get codes but I couldn't get that to work. It's driving me crazy. It ran great until I changed that module, I even tried putting the old one back on. Any advice would help tremendously.
03 gmc has a bad battery drain
- Thread starter chad0202
- Start date
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Tell us more about the circumstances of the new parasitic draw -- what other work was done around the time of the DDM replacement and when you noticed the issue?
Is the replacement DDM GM OE, used, or aftermarket?
Is the replacement DDM GM OE, used, or aftermarket?
West 1
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Unplug the new module or re install the old unit and see if your drain is gone. Might isolate where the drain is coming from.
strutaeng
Full Access Member
Probably just coincidence about the door module... especially because you mentioned you swapped the old module back and no change.
You need to properly diagnose this. Watch a few videos on parasitic drain. South Main Auto has some good ones...
You need to properly diagnose this. Watch a few videos on parasitic drain. South Main Auto has some good ones...
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Welcome to the Forum from NH.
Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.
I hope that you will become a participating member in the Forum's discussions.
Pics of the truck, please.
You are already receiving clarifying questions and suggestions from the knowledgeable folks on this Forum.
I think that your comment regarding getting into the back and having someone on the outside spray water on the truck with a garden hose warrants a try.
Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.
I hope that you will become a participating member in the Forum's discussions.
Pics of the truck, please.
You are already receiving clarifying questions and suggestions from the knowledgeable folks on this Forum.
I think that your comment regarding getting into the back and having someone on the outside spray water on the truck with a garden hose warrants a try.
rockola1971
Full Access Member
I am not sure what OP means by this statement "When I do charge it enough to drive it shuts off every time I stop.". The typical culprit for the battery drain is a dirty, loose or corroded ground. The key players in this are the engine to firewall braided ground strap (which usually rots in half) or the grounds down on the chassis drivers side directly below where the firewall is on the chassis.
The BCM uses the chassis ground as a voltage reference. This reference is used to make decision on when and how much to go into sleep mode. When the BCM is not in sleep mode it will draw power from your battery at a high enough rate to discharge a battery enough where it will not be able to be used to start the engine (low voltage to starter).
The BCM uses the chassis ground as a voltage reference. This reference is used to make decision on when and how much to go into sleep mode. When the BCM is not in sleep mode it will draw power from your battery at a high enough rate to discharge a battery enough where it will not be able to be used to start the engine (low voltage to starter).
