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Service bulletin PIT5509B

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 id10116656
Published by NHTSA2017-08-31
Manufacturer's numberPIT5509B
Manufacturer's date2017-03-14
NHTSA componentSERVICE BRAKES; ELECTRICAL SYSTEM

NHTSA's 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.

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

Brakes, Electrical system

Trouble codes named

C1114

Vehicles listed
CHEVROLET SILVERADO2017
CHEVROLET SILVERADO 15002014 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SILVERADO 25002015, 2016 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SUBURBAN2015, 2016, 2017
CHEVROLET TAHOE2015, 2016, 2017
GMC SIERRA2017
GMC SIERRA 15002014, 2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
GMC YUKON2015, 2016, 2017
GMC YUKON XL2015, 2016, 2017

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

Recalls for the same vehicles and component
20242942024-05-24. Electrical
20214072021-07-01. Electrical
20195332019-10-24. Brakes
19V7610002019-10-24. SERVICE BRAKES; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:WHEEL SPEED SENSOR/TONE RING; ELECTRONIC STABILITY CONTROL (ESC)
19V6450002019-09-06. SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM
20193252019-06-28. Electrical
20193242019-06-28. Brakes
20192042019-04-26. Electrical
20184642018-08-31. Brakes
18V5780002018-08-30. SERVICE BRAKES, HYDRAULIC:PEDALS AND LINKAGES

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
18-NA-1802025-10-16. Service bulletin. This Warranty Administration service bulletin provides Lithium-Ion battery Exchange Process and Transaction Submission information.
18-NA-1802025-09-26. Service bulletin. This Warranty Administration service bulletin provides Lithium-Ion battery Exchange Process and Transaction Submission information.
25-NA-0872025-05-02. Service bulletin. This service bulletin provides information on the proper Reflective High Temperature Heat and/or Insulating Tape to use for certain repairs, such as Wiring Harness Repairs.
23-NA-0012025-04-28. Service bulletin. This service bulletin provides information for dealers/technicians on OnStar Module 2G Sunset Information.
13-08-116-001K2025-04-25. Service bulletin. The intent of this service bulletin is to identify aftermarket ALDL or DLC interface devices as potential sources for causing multiple customer concerns that do not have other diagnostic methods to identify them.
24-NA-0982025-04-24. Service bulletin. This service bulletin provides information for dealers/technicians on Service Programming System (SPS) Error Codes E4398, E4399, E4401, E4403, M4404, M4413, M6954, M6955, E4414, E4423, E4491, E4492, or E6961 and resolution information.
25-NA-0652025-04-24. Service bulletin. This informational bulletin instructs the tech when fuel/fluid is needed to be tested and where it can be sent for analysis.
15-06-03-001F2025-04-15. Service bulletin. This service bulletin provides information to diagnose batteries that have set for a long period of time and/or cold weather climates and testing those batteries.
21-NA-0432025-02-12. Service bulletin. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
18-NA-1802025-01-30. Service bulletin. This Warranty Administration service bulletin provides Lithium-Ion battery Exchange Process and Transaction Submission information.