# Service bulletin MC\-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. - Type: Service bulletin - NHTSA id: 10078801 - Published by NHTSA: 2016\-08\-19 - Manufacturer's number: MC\-15521 - Manufacturer's date: 2016\-04\-26 - NHTSA component: ELECTRICAL SYSTEM:12V/24V/48V BATTERY; STRUCTURE:BODY:DOOR ## 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 No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number. ## Components Body and frame, Electrical system, 12\-volt battery ## Vehicles listed - 2011 to 2014 CADILLAC CTS - 2014 to 2016 CADILLAC ELR - 2004 to 2009 CADILLAC XLR - 2005 to 2016 CHEVROLET CORVETTE ## Other bulletins for the same vehicles and component - [20\-NA\-132](/bulletins/10252774.md), 2024-04-05, Service bulletin: ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; EQUIPMENT. This warranty administration bulletin provides policy information on the requirements for 12V battery testing and warranty replacements. - [PIT5074H](/bulletins/10247061.md), 2023-12-11, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ELECTRICAL SYSTEM. J\-35616\-64B Terminal Test Probe / Replacement Terminal / Terminated Lead. - [PIT5074G](/bulletins/10247060.md), 2023-12-11, Service bulletin: ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:12V/24V/48V BATTERY. Terminal Test Probe And Replacement Terminal. - [1408117001a](/bulletins/10246506.md), 2023-12-11, Service bulletin: ELECTRICAL SYSTEM:BODY CONTROL MODULE/BCM; ELECTRICAL SYSTEM:12V/24V/48V BATTERY:CABLES; UNKNOWN OR OTHER. Unable to Clear BCM DTCs After Completing Repair - [140842001](/bulletins/10246503.md), 2023-12-11, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY:CABLES; UNKNOWN OR OTHER; EXTERIOR LIGHTING:HEADLIGHTS:BULBS. Additional Diagnostic Tips for Headlamp Inoperative or Intermittent Conditions - [20NA132](/bulletins/10205059.md), 2021-12-20, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY. This warranty administration bulletin provides policy information on the requirements for battery testing and warranty replacements. - [PIC6439](/bulletins/10201293.md), 2021-09-13, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY:CABLES. This Preliminary information communicates a diagnostic tip to dealership technicians when diagnosing a B1517 DTC. - [150603002H](/bulletins/10190339.md), 2021-04-16, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT. Original Equipment Batteries Part Number and ACDelco Replacement Battery Approved Warranty Part Numbers Correct battery cold cranking amperage \(CCA\) ratings and type are critical for proper test results when using the EL\-50313. Access to the battery specification label, which contains the OEM part number and CCA rating and type, may be difficult without component removal. Refer to the table below for the original equipment ratings and part numbers used to set up a proper battery test. There has been some confusion as to the correct ACDelco battery warranty replacement. Refer to the table below for the correct battery warranty replacement. The correct ACDelco battery warranty replacement in the catalog is designated by the "Original Equipment Replacement" note in the description field. - [19NA242](/bulletins/10176615.md), 2020-06-22, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY; EQUIPMENT. This informational bulletin announces the availability of a High Voltage battery pack refurbish kit when the battery pack assembly needs to be replaced and information on how dealers can obtain the refurbish kit. - [PI0798A](/bulletins/10168213.md), 2019-11-25, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY. This preliminary information bulletin provides a procedure to correct a condition of a Check Engine Light with DTC P0C4A that Sets immediately after a repair to the High Voltage battery cooling system that involves draining/refilling of coolant. 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