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 |
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT5311F
Published date: 06/29/2020
MC-10178359-9999.pdf 109.633KB
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 VEHICLES 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
SB-10080686-2280.pdf 353.074KB
- PORTABLE — The Echo wireless trailer brake controller has a non-invasive, zero-tool install and easily transfers from one vehicle to another. It plugs between compatible vehicle and trailer 7-way RV blade connectors and wirelessly links to your smartphone using Bluetooth.
- SMARTPHONE-READY — Echo wirelessly syncs with your Apple or Android phone through the OneControl app, turning it into a brake controller interface for setup, brake adjustment and profile storage. Pair through the app, not the phone’s Bluetooth menu. Avoid distracted driving and only make adjustments when stationary.
- ZERO-TOOL INSTALL — Installing this mobile trailer brake controller is as easy as plugging into a compatible active 7-way RV blade connector with +12V power and ground. A locking tab and included retention strap help keep it firmly connected; strap is stored inside the cap.
- HIGHLY RESPONSIVE — Echo uses a triple-axis accelerometer to provide smooth proportional trailer braking. It maintains responsive braking when your phone screen is locked, receives incoming calls or if the Bluetooth connection is lost after setup.
- VERSATILE — This wireless electric trailer brake controller transfers between compatible vehicles and trailers and works with most trailers with 1 to 2 axles / 2 to 4 brakes. Compatible with cruise control, anti-lock brakes and low-voltage systems; vehicle 7-way must be active for operation.
- 【Intelligent braking】Proportional controllers are the safest and most responsive braking system you can install.Proportional trailer brake controllers automatically sense when your tow vehicle slows down or stops. This type of brake controller will replicate your own braking intensity for your trailer's brakes, whether you slow to a gradual stop or have to slam on your brakes
- 【Easy to display】LED Digital display screens show the voltage delivery going from the brake controller to the trailer's brakes. Easy to read, easy to observe vehicle conditions in real time.In case of emergencies, make adjustments in time
- 【Safer and more stable】Fits 1 to 4 axle (2 to 8 brakes) trailers to deliver a signal from your vehicle's brakes to your trailer,both quantity of braking power (result) and rate of the program (sync) can be adjusted to fit your inclination, the street conditions, and kind of trailer,increase the safety of driving.Requires no leveling
- 【Quick installation and use】Wiring ports are available for vehicle-specific brake controller harnesses and provide a quick connection between the controller and the towing vehicle for quick and easy installation or removal
- 【4 Wiring & controls】BLACK-Vehicle Power, RED-Stop Light, WHITE-Vehicle Ground, BLUE-Trailer Brakes
- Fitment:The Brakeman IV digital brake controller is designed for broad compatibility with a wide range of vehicles and trailers,including Ford
,GM,Chevy,Dodge,RAM,Toyota,Jeep,as well as trucks,RVs,tour buses,and other vehicles equipped with 1 to 4 axles (supporting 2-,4-,6-,and 8-brake systems). - Time-Delayed Brake Activation: The controller allows for precise control of braking over a set time delay, ensuring smoother braking transitions and reducing jerky or abrupt stops when towing a trailer.improving overall towing safety.
- LED Display for Clear Status Indication: Equipped with an LED display that clearly shows the current braking force, allowing users to monitor and adjust the settings for optimal performance.Adjustable brake force and consistent braking performance.
- Easy Installation: Compact and durable Design for simple installation,ensuring long-lasting performance. This controller can be quickly mounted in most vehicles with minimal effort, saving time and installation costs.
- Package Include: 1 x Brake Controller, 1 x mounting bracket, 6 x mounting screws, 1x instruction.
- Proportional Mode Brake for Everyday Towing: The Tow-Pro Liberty delivers Proportional Mode braking for smooth on-road control. Easy to install and use, the system reduces push and pull for ultimate towing confidence on roads and highways
- Universal Brake Controller for SUVs & Trucks: Pair with the universal pig tail wiring harness (TPH-025) or one of our vehicle specific brake controller wiring harnesses and switch inserts for factory-style integration (each sold separately)
- What’s Included: Tow-Pro Liberty Electric Brake Controller, Remote Head Assembly, Remote Head Nut, Remote Head Knob, Remote Head Bezel, Remote Head Cable 3’3” (1 m). Supports 1–2 axles. Fits most common trailer braking applications
- No Knee-Knocking and Sway Control: Compact dash dial blends seamlessly into your vehicle while Active Calibration and sway control deliver smooth braking, with or without a trailer to stay steady on roads
- Confidence for The Long Haul: Designed and torture-tested in the Australian Outback, it's engineered for the toughest towing conditions. Trusted for 45+ years, REDARC offers a 2 year limited warranty on this trailer brake controller
- PROFESSIONAL TRAILER BRAKE CONTROLLER: Ensure safe towing with the Briidea professional trailer brake controller. Designed for reliability, it gives you peace of mind by ensuring smooth braking, significantly reducing the risk of accidents and vehicle damage
- TIME-DELAY TRAILER BRAKE CONTROLLER: The time delay brake controller can activate the trailer brake by applying varying power within a set period of time. Once engaged, the LED display conveniently shows the gain setting, ensuring your safety while driving
- SAFETY PROTECTION: Our trailer brake controllers has advanced overcurrent protection, short circuit protection and fault detection for your road safety. With LED display, real-time display of your current Settings, output voltage and fault diagnosis, so that you can solve problems in a timely manner
- EASY TO INSTALL: Includes a versatile mounting bracket and accessories for installation in any position or angle. For optimal placement, we recommend mounting it under the dashboard to ensure it doesn't obstruct your view while driving. This allows you to conveniently operate and monitor trailer brake activity from the cab
- COMPATIBILITY: The trailer brake controller kit is compatible with any vehicle now your driving, designed to operate 1 to 4 braked axles (2- 8 brakes), ideal for light duty towing and Occasional towing, etc
Last update on 2026-06-14 / Affiliate links / Images from Amazon Product Advertising API
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Bulletin No.: PIT5311F
Published date: 06/29/2020
Preliminary Information
PIT5311F Check Trailer Wiring Message and/or Service Trailer Brake with DTC C1114 (Check Trailer
Ground and/or 7-way Connector)
Product Investigation Review Required Models
Brand:
Chevrolet Chevrolet Chevrolet Chevrolet Chevrolet Chevrolet GMC GMC GMC GMC GMC
Model:
Silverado 1500 Silverado Silverado LD
Silverado 2500/3500 Suburban
Tahoe Sierra Sierra
Sierra Limited Sierra 2500/3500 Yukon Models
Model Years:
2014
2015 – 2018
2019
2019
2015 – 2020
2015 – 2020
2014
2015 – 2018
2019
2019
2015 – 2020
VIN:
from to
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All All
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All All All All All All All All All All All
Transmissions:
Supersession Statement
This PI was superseded to add the 2020 Model Years. Please discard PIT5311E.
Condition / Concern
Some customers may experience an 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) – Engineering has released an updated truck side connector that incorporates a stronger door/cover spring, which helps hold the trailer side connector (plug) seated into the connector.
Recommendations / Instructions
1. Inspect and clean the ground wire (normally white wire) connection on the trailer side of the 7-pin connector.
• Make sure that the wires inside the trailer side connector are clean and securely fastened.
• If an electrical junction box exists on the trailer, make sure the wires inside the junction box are clean and securely fastened.
• Once this procedure is complete, check to see if the condition has been corrected. If the condition still exists, perform the following procedure:
1.1 Remove the original trailer ground wire (normally white wire) from the trailer side of the 7-pin trailer connector.
1.2 Install a ring terminal (PN 12103512 located in Delphi Tray 18 or equivalent) to this wire and fasten the ring terminal to the metal or aluminum chassis of the trailer using an M6x1x20 self-taping phosphate zinc coated screw (PN 11609540 or equivalent).
– Pre-drill trailer chassis location with a 3/16″ hole.
– Make sure the trailer chassis location is clean of paint or coating material prior to installation.
– Galvanic corrosion between dissimilar trailer and screw metals may require that this ground location be periodically cleaned.
1.3 Obtain a sufficient length of minimum 10 gauge (5.0 mm) white wire and fasten with ring (PN 12103512 or equivalent) terminal to the trailer chassis at the same location as the original ground wire.
1.4 Install and fasten the other end of the new ground wire into the trailer side of the 7-pin trailer connector
1.5 Install conduit on the original and new trailer ground wires and secure the conduit to the existing trailer harness.
2. 7-Way Trailer Connector
Trailer Side Connector (Plug) – Engineering has recommended the use of Pollak Heavy Duty 7-Way (Trailer Side) Connector Plugs. Pollak is the OEM manufacturer of the truck’s 7-way connector socket; and by using a Pollak Heavy Duty 7-Way (Trailer Side) Connector Plug, this will ensure proper fit when the two connectors are mated. Pollak’s website is:
www.pollakaftermarket.com/. Once at the home page select “Connectors” then “Heavy Duty 7-Way Plugs and Accessories” and then ” RV Connectors Heavy Duty & Adaptors” (example 12-706, 12-702).
Note: If the truck’s 7-way connector socket terminals are deformed or have excessive wear, it will be necessary to replace the truck side connector, see info below, along with the trailer’s 7-way connector plug to a Pollak HD.
Truck Side Connector (Socket) – If the truck’s 7-way trailer connector socket terminals are deformed, have excessive wear, door/cover not holding trailer connector plug securely, etc. it will be necessary to replace the truck side trailer connector socket with updated GM part number 23404450.
Parts Information
Part Number 23404450
Warranty Information
For trailer related issues:
Description
Truck 7-way Trailer Connector Socket
Qty 1
No warranty labor operation is provided for concerns related to the trailer. For Truck 7-Way Connector Replacement use:
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information.
Labor Operation Description
Labor Time
2460100
Wiring Harness Connector Replacement – Trailer Brake
Use Published Labor Operation Time
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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