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Service bulletin 15663

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 id10089571
Published by NHTSA2017-01-26
Manufacturer's number15663
Manufacturer's date2015-11-05
NHTSA componentELECTRICAL SYSTEM:WIRING

NHTSA's summary

15663 - SERVICE UPDATE. THIS BULLETIN PROVIDES A SERVICE PROCEDURE TO RELOCATE A WIRE CIRCUIT WITHIN THE ONSTAR CONNECTOR ON CERTAIN VEHICLES. THESE VEHICLES LACK A GROUND IN THE MICROPHONE RETURN PATH, WHICH RESULTS IN THE VOICE RECOGNITION BECOMING INOPERABLE WHEN THE VEHICLE IS IN RETAINED ACCESSORY (RAP) OR ACCESSORY POWER MODE. IN ADDITION, THE HANDS-FREE VOICE QUALITY CAN BE DEGRADED. THE ONSTAR FUNCTIONS ARE NOT IMPACTED BY THIS CONDITION.

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

Electrical system, Wiring and fuses

Vehicles listed
BUICK ENCLAVE2016
CHEVROLET TRAVERSE2016
GMC ACADIA2016

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

Other bulletins for the same vehicles and component
PIT59622023-01-30. Service bulletin. This Preliminary information communicates a GM part number for reflective high temperature heat or insulating tape when repairing wiring harnesses.
100089005G2019-05-13. Service bulletin. This warranty admin bulletin explains to the technician additional information may be needed when submitting transactions when doing wiring repairs.
100089005H2019-03-18. Service bulletin. This warranty admin bulletin explains to the technician additional information may be needed when submitting transactions when doing wiring repairs.
10-00-89-005E2018-05-21. Service bulletin. This warranty administration bulletin adds the 2016 model year to a communication which provides dealership personnel revised wiring repair labor operations and required additional information.
10-00-89-005F2017-10-05. Service bulletin. This informational bulletin provides warranty policy information on revised wiring repair labor operations and required additional information.