Check Trailer Wiring Message and/or Service Trailer Brake With DTC C1114 – 2014-2020 Chevrolet GMC

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NHTSA ID Number: 10178359

Manufacturer Communication Number: PIT5311F

 

Summary

This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that may have an intermittent “Check Trailer Wiring” or “Service Trailer Brake” message on the Driver Information Center. Technician will inspect and clean the ground wire (normally white wire) connection on the trailer side of the 7-pin connector. Inspect that the wires inside the trailer side connector are clean and securely fastened. If the vehicle’s 7-way connector socket terminals are deformed or have excessive wear, it will be necessary to replace the truck side connector with part number 23404450.

 

49 Affected Products

Vehicles

MAKE MODEL YEAR
CHEVROLET SILVERADO 1500 2014-2019
CHEVROLET SILVERADO 2500 2019
CHEVROLET SILVERADO 3500 2019
CHEVROLET SUBURBAN 2015-2020
CHEVROLET TAHOE 2015-2020
GMC SIERRA 1500 2014-2019
GMC SIERRA 2500 2019
GMC SIERRA 3500 2019
GMC YUKON 2015-2020
GMC YUKON DENALI 2015-2019
GMC YUKON DENALI XL 2015-2018
GMC YUKON XL 2015-2020

 


Condition / Concern

Intermittent “Check Trailer Wiring” message and/or a “Service Trailer Brake” message with DTC C1114 on vehicles equipped with ITBC (Integrated Trailer Brake Controller) RPO JL1. Below are two possible causes for these concerns.

Note: The below two possible causes can also affect a truck equipped with an aftermarket trailer brake controller.

1. These concerns may be displayed each time the trailer’s running lamps, turn signal lamps, or brake lamps are turned on, especially if the trailer is equipped with a large number of lamps. This condition is most likely caused by insufficient trailer grounding and the trailer ground wiring will need to be repaired and/or upgraded.

2. These concerns could be caused by a poor connection at the 7-way trailer connector. It could be either the truck and/or trailer side of the connector.

Trailer Side Connector (Plug) – There are several manufacturers of 7-way (trailer side) connectors and many do not comply with the SAE standard specifications. Some 7-way (trailer side) connector plugs may not properly engage the truck’s 7-way connector socket and cause open circuits.

Since the Trailer Brake Control Module is always monitoring the vehicle and trailer circuits/components, a poor connection at the 7-way connector can cause a “Check Trailer Wiring” message on the DIC. Also, they may cause deformation and excessive wear of the terminals on the truck’s 7-way connector socket. Over time, this will lead to poor terminal tension between the 7-way (trailer side) connector plug and the truck’s 7-way connector socket.

Truck Side Connector (Socket) – An updated truck side connector has been released that incorporates a stronger door/cover spring, which helps hold the trailer side connector (plug) seated into the connector.

 

Parts Information

Qty Description Part Number
1 Truck 7-way Trailer Connector Socket 23404450 Check Trailer Wiring Message and/or Service Trailer Brake With DTC C1114 - 2014-2020 Chevrolet GMC | small light

 


1 Associated Document

Manufacturer Communications

Bulletin No.: PIT5311F
Published date: 06/29/2020

https://www.nhtsa.gov/recalls?nhtsaId=10178359

MC-10178359-9999.pdf 109.633KB

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NHTSA ID Number: 10080686

Manufacturer Communication Number: PIT5311B

 

Summary

THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ON THE STEPS TO DIAGNOSE AND REPAIR VEHICLES THAT MAY HAVE AN INTERMITTENT “CHECK TRAILER WIRING” OR “SERVICE TRAILER BRAKE” MESSAGE ON THE DRIVER INFORMATION CENTER. TECHNICIAN WILL INSPECT AND CLEAN THE GROUND WIRE (NORMALLY WHITE WIRE) CONNECTION ON THE TRAILER SIDE OF THE 7-PIN CONNECTOR. INSPECT THAT THE WIRES INSIDE THE TRAILER SIDE CONNECTOR ARE CLEAN AND SECURELY FASTENED. IF THE VEHICLE’S 7-WAY CONNECTOR SOCKET TERMINALS ARE DEFORMED OR HAVE EXCESSIVE WEAR, IT WILL BE NECESSARY TO REPLACE THE TRUCK SIDE CONNECTOR FROM GENERAL MOTORS CUSTOMER CARE AND AFTERSALES ALONG WITH THE TRAILER’S 7-WAY CONNECTOR PLUG.

 

1 Associated Document

Service Bulletin Document

Bulletin No.: PIT5311 B
Date: Jun-2016

https://www.nhtsa.gov/recalls?nhtsaId=10080686

SB-10080686-2280.pdf 353.074KB

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“This site contains affiliate links for which OEMDTC may be compensated”
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1 thought on “Check Trailer Wiring Message and/or Service Trailer Brake With DTC C1114 – 2014-2020 Chevrolet GMC”

  1. I had this problem; my original plug was cracked, and was replaced with a non- GM plug twice, and I continued to get the warning. I finally had an original equipment (Genuine GM) plug installed, and that solved the problem! Yay

    Reply

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