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October 28, 2019 Service bulletin

This Preliminary Information communication provides information to the technician on how to diagnose and...

Chevrolet technical service bulletin PIT5509E for 2014, 2018 Chevrolet Silverado 1500, 2015-2020 Chevrolet Tahoe and 2014, 2018 GMC Sierra 1500 and others.

Bulletin number
PIT5509E
Component
Electrical system
Summary
This Preliminary Information communication provides information to the technician on how to diagnose and repair vehicle that may have a "Check Trailer Wiring" or "Service Trailer Brake System? message on the Driver Information Center when a trailer is connected to the vehicle. Diagnostic Trouble Code C1114 set in the Chassis Control Module. Chassis Control Module has to determine the type of trailer brake system that is being used. The Chassis Control Module can be sensitive to a variety of trailer wiring issues. The technician will need to make a trailer tester using Electric Trailer Brake Magnets and 7-way trailer connector to determine if it is a vehicle or trailer issue. If the concern is not duplicated with the tester installed, the vehicle is operating correctly and the focus should be on the trailer wiring or 7 way connector.

Owners of these vehicles have filed 1,523 complaints in the electrical category.

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