PI0412B

File in Section:
Service Bulletin
Bulletin No.:
Date:
PI0412B
March, 2013
PRELIMINARY INFORMATION
Subject:
No Crank/No Start, Dead Battery Due to Parasitic Drain/Discharge
Models:
2011-2013 GM Passenger Cars and Trucks (Except Cadillac STS, Chevrolet Volt)
Equipped with OnStar®
This PI is being revised to add the 2012 and 2013 model years and add information to the
Recommendation/Instructions and Parts Information sections. Please discard PI0412A.
Condition/Concern
In very rare cases, some customers may comment on a dead battery or a no start condition and there may also be
no OnStar® LED light (after the vehicle has been restarted for at least a minute).
A 380♦mA drain from the OnStar® Module may be a cause of this condition.
Recommendation/Instructions
Perform the Battery Electrical Drain/Parasitic Load Test per the published procedure in SI.
If the parasitic draw is close to 380 mA, remains for more than 10 minutes, the OnStar® LED light is not lit and there
is no response to an OnStar® button press, even while the vehicle is running, pull the fuse on the OnStar® circuit or
disconnect the OnStar® module connector (when OnStar® fuse powers multiple modules) and verify the parasitic
current drops to normal levels. For vehicles that have the OnStar® module between other GMLAN modules in the
LAN circuits, it will be necessary to jumper the LAN terminals at the OnStar® module connector. If the parasitic
current drops to normal levels, replace the OnStar® communication interface module.
Note: The reason that the parasitic current must remain for at least 10 minutes is because the OnStar® module
sometimes will connect to the OnStar® back office in power off mode to upload data for the OnStar® monthly emails.
Parts Information
For part number and usage of the communication interface module, see Group 09.645 of the appropriate Parts
Catalog. Certain OnStar® modules are on a parts restriction program. Please refer to the latest version of Corporate
Bulletin Number 03-08-46-004.
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
R5143
Description
Communication Interface
Module Replacement
Labor
Time
Use
Published
Labor
Operation
Time