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Service bulletin 15521

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10137768
Published by NHTSA2018-05-21
Manufacturer's number15521
Manufacturer's date2016-04-26
NHTSA componentELECTRICAL SYSTEM:IGNITION:ANTI-THEFT:CONTROL MODULE; ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ELECTRICAL SYSTEM:IGNITION

NHTSA's summary

15521 ? Customer Advisory Letter. On these vehicles, if the side doors will not open from inside the vehicle due to low or no battery voltage, such as a discharged or disconnected battery, or if the vehicle is entered without the key fob or the fob is not working, customers are being advised that the driver and passenger side doors can still be opened from inside the vehicle by using the manual release levers located on the floor between the seats and the door openings. Also, if the vehicle's side doors will not open from outside the vehicle due to low or no battery voltage, such as a discharged or disconnected battery, or if the key fob is not working, customers are being advised that the driver side door can still be opened by using their key to manually open the vehicle's trunk and pulling the manual door release tab located in the trunk.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, 12-volt battery, Ignition

Vehicles listed
CADILLAC CTS2011, 2012, 2013, 2014
CADILLAC ELR2014, 2015, 2016
CADILLAC XLR2004, 2005, 2006, 2007, 2008, 2009
CHEVROLET CORVETTE2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
14V3940002014-07-02. ELECTRICAL SYSTEM:IGNITION

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
PIP5130D2024-04-22. Service bulletin. Engine Cranks But Will Not Start May Set P00C6.
PIP5130B2024-04-22. Service bulletin. Engine Cranks But Will Not Start May Set P00C6.
PIE02962024-04-15. Service bulletin. Engineering Information
20-NA-1322024-04-05. Service bulletin. This warranty administration bulletin provides policy information on the requirements for 12V battery testing and warranty replacements.
PIT5074H2023-12-11. Service bulletin. J-35616-64B Terminal Test Probe / Replacement Terminal / Terminated Lead.
PIT5074G2023-12-11. Service bulletin. Terminal Test Probe And Replacement Terminal.
1408117001a2023-12-11. Service bulletin. Unable to Clear BCM DTCs After Completing Repair
1408420012023-12-11. Service bulletin. Additional Diagnostic Tips for Headlamp Inoperative or Intermittent Conditions
14497A2023-12-04. Service bulletin. Unintended Ignition Key Rotation
14172B2023-12-04. Service bulletin. Unintended Ignition Key Rotation