oemdtc.com

Recalls, Repair & Diagnostic Tips
Menu
  • Recalls
    • Aston Martin Recalls
    • BMW Recalls
    • Bugatti Recalls
    • Chrysler Dodge Fiat Jeep Ram Alpha Romeo Recalls
    • Ferrari Recalls
    • Ford Recalls
    • GM Recalls
    • Acura & Honda Recalls
    • Hyundai Recalls
    • Isuzu Recalls
    • Jaguar & Land Rover Recalls
    • Kia Recalls
    • Lamborghini Recalls
    • Maserati Recalls
    • Mazda Recalls
    • Mercedes-Benz Recalls
    • Mitsubishi Recalls
    • Infiniti & Nissan Recalls
    • Porsche Recalls
    • Subaru Recalls
    • Suzuki Recalls
    • Tesla Recalls
    • Toyota Lexus & Scion Recalls
    • Volvo Recalls
    • VW Audi Recalls
  • Diagnostic Tips
    • Ford Diagnostic Tips
    • GM Diagnostic Tips
    • Mazda Diagnostic Tips
    • Subaru Diagnostic Tips
  • Repair Tips
    • Ford Repair Tips
    • GM Repair Tips
    • Mazda Repair Tips
    • Subaru Repair Tips
  • Links
  • E-Books
  • Store
  • oemdtc
    • Aston Martin
    • BMW
    • Bugatti
    • Chrysler Dodge Fiat Jeep Ram Alpha Romeo
    • Ferrari
    • Ford
    • GM
    • Acura & Honda
    • Hyundai
    • Isuzu
    • Jaguar & Land Rover
    • Kia
    • Lamborghini
    • Maserati
    • Mazda
    • Mercedes-Benz
    • Mitsubishi
    • Infiniti & Nissan
    • Porsche
    • Subaru
    • Suzuki
    • Tesla
    • Toyota Lexus & Scion
    • Volvo
    • VW-Audi

Amazon Sells Car & Truck Parts Search by Part Number

Buy Car & Truck Parts on Amazon
Home
Diagnostic Tips
Integrated Trailer Brake Control System – 2014-2016 Chevrolet & GMC
Diagnostic Tips

Integrated Trailer Brake Control System – 2014-2016 Chevrolet & GMC

oemdtc October 28, 2016 No Comments

NHTSA ID Number: 10081241

Manufacturer Communication Number: PIT5509

 

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.

 

13 Affected Products

Vehicles

MAKE MODEL YEAR
CHEVROLET SILVERADO 1500 2014-2016
CHEVROLET SUBURBAN 2014-2016
CHEVROLET TAHOE 2015-2016
GMC SIERRA 1500 2014-2016
GMC YUKON 2015-2016

#PIT5509: Diagnostic Tip – Integrated Trailer Brake Control System – (Jun 14, 2016)

Subject: Diagnostic Tip – Integrated Trailer Brake Control System
Models: 2014 Chevrolet Silverado 1500
2015-2016 Chevrolet Silverado, Suburban, Tahoe
2014 GMC Sierra 1500
2015-2016 GMC Sierra and Yukon Models
With Integrated Trailer Brake Control (ITBC) system RPO JL1

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

 

Condition/Concern

Some customers may comment that when they have a trailer connected to the vehicle, they get a “Check Trailer Wiring” or “Service Trailer Brake System” message on the DIC.   DTC C1114 could be set in the Chassis Control Module (CCM).

Diagnosing these concerns can be difficult because the issue could either be related to the truck or the trailer. This PI is to provide some additional diagnostic information for these three symptoms:

  • Check Trailer Wiring message
  • Check Trailer Wiring message with DTC C1114
  • Service Trailer Brake System message with DTC C1114

 

Recommendation/Instructions

General Information

The trailer brake control system on the new body style trucks is compatible with two types of trailer brake systems: electromagnetic or electro-over hydraulic trailer brakes.  The Chassis Control Module K38 (CCM) must determine which type of brakes the trailer is equipped with so the system can output correctly for the trailer’s brake system.  Because the CCM has to determine the type of trailer brake system that is being used, it can be sensitive to a variety of trailer wiring issues.

The Trailer Brake Power Control Module K133 continuously sends a test pulse out on the trailer control circuit 47, looking for a trailer that has been connected, and also to monitor for circuit faults.  The way the test pulse reacts when a trailer is connected is how the CCM determines which type of braking system the trailer is equipped with.

Even after the system detects the trailer, it will continue to send this test pulse on circuit 47, which now is monitoring both the truck and trailer circuitry.  Circuit 47 continues to be monitored for any faults so the driver can be notified of any issues that may occur within the truck or trailer, as well as, to determine when the trailer is disconnected from the truck.  If the CCM detects an issue, it will either display a “Check Trailer Wiring” or “Service Trailer Brake System” message on the DIC.  See DIC message/DIC below.

 

Electro-over Hydraulic Trailer Brakes

Electro-over hydraulic brake systems have some unique characteristics and here are a couple examples:

  • The electro-over hydraulic brake pump motor needs a minimum duty cycle of approximately 20-30% to turn on the pump motor.  If the user gain is set too low, or during light brake pedal apply the pump motor may not turn on.  This is normal.  Increasing the user gain or brake pedal pressure will help alleviate this concern.
  • When applying the brake pedal at 0 mph (stopped) there will be no output from the truck’s trailer brake system to the electro-over hydraulic pump motor.  This is normal.

Testing The Truck’s Trailer Brake System In many cases, trailer brake issues are the result of trailer wiring concerns and they are not related to the actual vehicle’s wiring.  Most trailers with these wiring issues do not have high standards in relation to wiring/connections/splices/routing practices (see examples in Step 3 below) when compared to similar automotive practices for wiring/connections/splices/routing.  Because of this, the CCM can set faults, which can be hard to determine if they are related to the truck or trailer.  The easiest and fastest way to test the truck is to make a tester using trailer brake magnets.  This type of tester utilizes actual trailer brake magnets and will load the truck’s electrical system, just like a trailer would do without having to have the complete trailer.  Shown below is an examples of such a tester.  The trailer brake system will operate with 1 to 4 pairs of trailer brake magnets (1 pair of magnets = 1 axle).  It is suggested to make a tester where the pairs of magnets can be added or removed to equal the same number of brakes as the customer’s trailer.  Also, it is advised to make the harness long enough so it can be plugged into the truck’s 7 way connector and have the magnets placed into the bed of the truck.  When the tester is connected to the truck, the DIC will display “Trailer Connected” and GDS2 will show “Electro-magnetic” brakes in the CCM data parameter “Trailer Brake Type”, refer to item 1 in “GDS2 Data” section below.  If so, the vehicle can be driven to see if any fault messages or DTC’s set.  If none occur with the tester installed, the truck is operating correctly and the focus should be on the trailer wiring or 7 way connector.

tester using trailer brake magnets

 

Making the Tester

Parts needed:

  1. 7 way RV trailer connector (example: Pollak Heavy Duty 7-Way Part # 12-706 ) Qty: 1
  2. Electric Trailer Brake Magnets (example: Dexter Axle Part # K71-104-00 )  Qty: 2, 4, 6, or 8
  3. 12 gauge wire and terminals/connectors Qty: as needed

Connect two 12 gauge wires to the 7-way RV trailer connector: one to the “Ground” terminal and a second to the “Brake Controller Output” terminal (circuit 47), shown below.  Connect the other ends of the 12 gauge wires to the trailer brake magnets.  All magnets must be connected in parallel so each magnet wire is connected to the Ground and Brake Controller Output wires from the 7 way connector.

Note: Do NOT connect the magnets in series with each other.

7 way trailer connector

Trailer Brakes

If, after using the tester shown above, the truck functions properly, you may follow the diagnostic tips listed below to help diagnose a trailer related issue.  Trailer issues are NOT covered under warranty, but this information listed below can be used to help the customer/trailer supplier understand and correct any trailer related issues if they so choose.

 

DIC Message/ DTC’s

It is important to understand and determine what message is being displayed, as well as, if DTC C1114 is setting.  This will help determine what type of fault to inspect for on the trailer.  Below is the combinations of message(s)/DTC to determine the type of fault the customer is experiencing:

  • Check Trailer Wiring message with no DTC.  This symptom is caused after the system detects a trailer and an open and/or high resistance occurs in circuit 47/trailer brake output circuit, during the same ignition cycle.  NOTE: It is normal for the DIC to display “Check Trailer Wiring” when the trailer is disconnected from the truck while the ignition is in the run position.
  • Check Trailer Wiring message with DTC C1114 (NO Service Trailer Brake message).  This symptom is caused by a short to ground on circuit 47.
  • Service Trailer Brake System with DTC C1114.  This symptom is caused by a short to power on circuit 47 or a poor trailer ground.

 

GDS2 Data

GDS2 (scan tool) can be used to view several different data parameters in the CCM for the trailer brake system.  The Trailer Brake Type and Trailer Brake Control Output Circuit parameters listed below can be helpful to make sure the CCM is detecting the correct trailer brake system in addition to which type of fault it has detected.

To view “Trailer Brake Type” build GDS2 as follows: CCM->Data Display -> parameter “Trailer Brake Type”:  “Electro-magnetic”,  “Electro-over hydraulic brakes”, or “Undefined” (this is displayed with no trailer connected). Example, shown below is a trailer equipped with electromagnetic trailer brakes.

Trailer Brake Type

To view “Trailer Brake Control Output Circuit”  47 faults, build GDS2 as follows: CCM->Data Display -> parameter “Trailer Brake Control Output Circuit”: Okay, Short to Ground, Short to Power, or Unknown.  Example, shown below is a trailer with a short to ground on the trailer brake circuit.

Trailer Brake Control Output Circuit

  1. Trailer Brake Type Parameter
    When the trailer is connected, this parameter should be used to make sure the CCM has detected the correct type of trailer brakes.  If the CCM is detecting the wrong type of trailer brakes here are a couple examples that could cause this:

    • Refer to the “Trailer Issues” section below items 4 and/or 5.
    • A trailer equipped with electromagnetic brakes on only one axle (meaning there is only one pair of magnets) could have a fault with one of the two magnets causing the CCM to detect the wrong trailer brake type.
  2. Trailer Brake Control Output Circuit Parameter
    When the trailer is connected, this parameter can be used to help determine what type of fault the system has detected on circuit 47, which could lie within the truck or trailer.

 

Sample Wiring Diagram

Below is an example of the truck’s trailer brake system with the two main circuits that interface with the trailer brake system circled.

Note: As always, use SI to look up the latest wiring diagrams for the vehicle being worked on.

Wiring Diagram

 

Trailer Issues

  1. The most likely reason for many of these issues is a poor/loose connection between the truck and trailer 7-way connector.  It is recommended to use a “Pollak HD” RV trailer connector, as shown in the latest version of PIT5311.  Pollak is the OEM manufacturer of the truck’s 7-way connector.  By using a Pollak trailer connector, this will provide the best connection possible.
  2. Shown below is an example of a 5th wheel trailer where the trailer harness has been routed over the top of the tailgate and plugged into the truck’s bumper connector.   While driving down the road, the trailer’s wiring harness will bounce up and down (A), causing the trailer’s 7-way connector to lose connection (B) with the truck.  The fix in this case was to add the 5th wheel/camper wiring harness and route the 7-way connector’s harness inside the box of the truck, as shown (C).

Note: This same concern can also happen with bumper pull trailers if there is an excessive length of harness.  Securing the excessive trailer harness and installing the Pollak HD RV trailer connector per PIT5311 will help.

excessive trailer harness

  1. Poor trailer wiring connections, as shown below.  General Motors does not recommend these type of connections, but many trailers utilize these connections.  These type of connections are not robust and are not recommended, especially for brake wiring.

trailer wiring connections

trailer wiring connections

  1. Aftermarket trailer sway control devices, like the example shown below.  These devices can apply the trailer’s brakes to control trailer sway.  When this happens, the truck will detect this and set DTC C1114.  It will also display a “Service Trailer Brake” message on the DIC.  NOTE:  If a trailer sways this is likely caused by improper loading of the trailer, refer to the owner’s manual for more information.

Aftermarket trailer sway control devices

  1. The CCM is detecting the wrong type of trailer brakes.  This is normally caused by an aftermarket device wired into the trailer.  The example shown below is an electric over hydraulic-to-electric brake adapter.  These adapters are used to make a truck that only works with electric trailer brakes work with a trailer that has electric over hydraulic brakes.  These adapters are NOT recommended.  In addition, the new body style trucks are compatible with both types of trailer brake systems: electro-magnetic or electro-over hydraulic.

electric over hydraulic-to-electric brake adapter

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.


Bulletin No.: PIT5509
Date: Jun-2016

https://www.nhtsa.gov/recalls?nhtsaId=10081241

https://static.nhtsa.gov/odi/tsbs/2016/SB-10081241-2280.pdf

To View or Download this Document Click Here


 

Bestseller No. 1
Tekonsha 90885C Prodigy P2 Universal Super Intelligent High Powered Electronic Trailer Brake Control System
Tekonsha 90885C Prodigy P2 Universal Super Intelligent High Powered Electronic Trailer Brake Control System
  • UNIVERSAL SYSTEM: Universal electronic brake control system designed to make trailer towing safer and easier
  • FITS 1 TO 4 AXLES: Fits 1 to 4 axle trailers to deliver a signal from your vehicle's brakes to your trailer
  • BATTERY PROTECTION: Features reverse battery protection for both vehicle and breakaway
  • MOUNTING VERSATILITY: Numerous mounting options offer versatile installation
  • INCLUDES 1 BRAKE SYSTEM: Includes 1 electronic brake control system for 1 to 4 axle trailers
$105.99
Buy on Amazon Price incl. tax, excl. shipping
SaleBestseller No. 2
Tekonsha 90160 Primus IQ Electronic Brake Control
Tekonsha 90160 Primus IQ Electronic Brake Control
  • Utilizes Plug-N-Play port for 2-plug adapters
  • Self-diagnostics features will illuminate LED readout when issues occur
  • Works proportionally in reverse
  • Includes a Boost feature
  • Snap-in dash mounting clip and hardware included
$75.25
Buy on Amazon Price incl. tax, excl. shipping
Bestseller No. 3
Tekonsha 90195 P3 Electronic Brake Control
Tekonsha 90195 P3 Electronic Brake Control
  • A distinct, easy-to-read LCD display with multiple screen color options, displays in English, French or Spanish
  • Diagnostics show output current, battery, brake, and output voltage and warning system alerts to No Trailer Brake situations
  • Boost feature allows for different levels of customized braking, select Electric over Hydraulic or Electric trailer brake mode
  • Integrated Plug-N-Play port for 2-plug adapters and Snap-in mounting clip allows user to remove and store the control when not in use
  • Compact, dash-hugging design. Electric trailer brake control for up to 4 braking axles.
$135.03
Buy on Amazon Price incl. tax, excl. shipping
Bestseller No. 4
Reese Towpower 8508211 Brake Control (Proportional BRAKE-EVN)
Reese Towpower 8508211 Brake Control (Proportional BRAKE-EVN)
  • 1-4 Axle capacity
  • Boost feature gives ability to apply more initial trailer braking
  • Reverse battery protection
  • No leveling required
  • Diagnostics features incorporated in easy to read LED display
$56.23
Buy on Amazon Price incl. tax, excl. shipping
SaleBestseller No. 5
REESE Towpower 8507111 Brakeman IV Digital Brake Control, Small Compact Design
REESE Towpower 8507111 Brakeman IV Digital Brake Control, Small Compact Design
  • INSTALLS QUICKLY: This 100% solid-state electronic with a small compact design mounts in any direction, no leveling required. Pre-wired plug-and-play feature allows for quick and easy connection to 2-, 4-, 6- and 8- brake systems.
  • ADJUSTS EASILY: Two separate easy push-button adjustment controls (output and sync) allow for not only different trailer weights (output) but also the speed of activation (sync) depending on your driving style.
  • DIGITAL DISPLAY: Bright and prominent digital display clearly indicates the output setting, sync setting, brake overload or short connection.
  • SAFE & SECURE: This device includes advanced internal circuit protection to help prevent damage and is for use on 12-volt negative ground systems only. Includes a limited lifetime warranty.
$35.00
Buy on Amazon Price incl. tax, excl. shipping
SaleBestseller No. 6
CURT 51170 Spectrum Original Equipment Style, Integrated Electric Trailer Brake Controller, Proportional
CURT 51170 Spectrum Original Equipment Style, Integrated Electric Trailer Brake Controller, Proportional
  • Fit Type: Universal Fit
$199.00
Buy on Amazon Price incl. tax, excl. shipping
Bestseller No. 7
CURT 51180 Echo Mobile Electric Trailer Brake Controller with Bluetooth-Enabled Smartphone Connection, Proportional
CURT 51180 Echo Mobile Electric Trailer Brake Controller with Bluetooth-Enabled Smartphone Connection, Proportional
  • PORTABLE. The Echo trailer brake controller has a non-invasive install and is easily transferrable from one vehicle to another. It plugs into any 7-way connector, wirelessly links to your smartphone using Bluetooth
  • SMARTPHONE-READY. The Echo brake controller wirelessly syncs with Apple or Android smartphone, turning it into a brake controller interface with the Smart Control app (Warning: Avoid distracted driving. Only make adjustments when vehicle is stationary)
  • ZERO-TOOL INSTALL. Installing this aftermarket trailer brake controller is as easy as plugging in a 7-way trailer wiring connector. It requires no tools, no extra wires and no hardware
  • HIGHLY RESPONSIVE. Echo uses a triple-axis accelerometer to provide smooth, safe braking. It maintains responsive braking, even when your phone screen is locked, receives incoming calls or if the Bluetooth connection is lost
  • VERSATILE. This electronic trailer brake controller easily transfers between vehicles and trailers and works on virtually any trailer with 1 to 2 axles (2 to 4 brakes). It is also fully compatible with cruise control, anti-lock brakes, low-voltage systems
$237.95
Buy on Amazon Price incl. tax, excl. shipping
Bestseller No. 8
GM Genuine Parts 84108373 Black Trailer Brake Control Switch Assembly
GM Genuine Parts 84108373 Black Trailer Brake Control Switch Assembly
  • GM-recommended replacement part for your GM vehicle’s original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured with GM Original Equipment specification for fit, form, and function
  • Made in China
$39.99
Buy on Amazon Price incl. tax, excl. shipping
Bestseller No. 9
TEKONSHA P3 BRAKE CONTROL + WIRING HARNESS FOR 03-06 CHEVY SILVERADO, GMC SIERRA, SUBURBAN, TAHOE, YUKON, DENALI, HUMMER. CONTROLLER + PLUG/PLAY WIRE KIT.
TEKONSHA P3 BRAKE CONTROL + WIRING HARNESS FOR 03-06 CHEVY SILVERADO, GMC SIERRA, SUBURBAN, TAHOE, YUKON, DENALI, HUMMER. CONTROLLER + PLUG/PLAY WIRE KIT.
  • Comes with Direct fit wiring harness, brackets, Hardware
$154.87
Buy on Amazon Price incl. tax, excl. shipping
Bestseller No. 10
XtremeAmazing Dashboard Trailer Brake Control Module Kit Compatible with Ford F-150 2011-2014
XtremeAmazing Dashboard Trailer Brake Control Module Kit Compatible with Ford F-150 2011-2014
  • Replaces Part Number: BL3Z-19H332-AA, BL3Z-2C006-BC
  • Note: Vehicles must be equipped with Trailer Tow Package or Max Trailer Tow Package (wiring) for kit to be functional.
  • Compatible with Ford F-150 2011-2014
  • Package Contents: 1x Trailer Brake Control Module Kit
$123.99
Buy on Amazon Price incl. tax, excl. shipping

Last update on 2021-01-19 / Affiliate links / Images from Amazon Product Advertising API

Last update on 2021-01-19 / Affiliate links / Images from Amazon Product Advertising API

Share
Tweet
Email
Pinterest
Linkedin
Stumble
Reddit
Prev Article
Next Article

Related Articles

2019 Chevrolet Silverado 1500
NHTSA ID Number: 10161880 Manufacturer Communication Number: 18NA279 Summary This informational bulletin …
Diagnostic Tips oemdtc January 21, 2019 No Comments

Passive Door Unlocking Inoperative and/or Enabling and Disabling of Passive Unlocking – 2019-2020 Cadillac Chevrolet GMC Opel

2014 Buick LaCrosse
NHTSA ID Number: 10137876 Manufacturer Communication Number: PI1205 Summary This preliminary bulletin …
Diagnostic Tips oemdtc February 6, 2017 1 Comment

Adaptive Forward Lighting Service Message Displayed on DIC, DTC B257C or B257D Set – 2014 Buick LaCrosse

2015 Chevrolet Volt
NHTSA ID Number: 10139324 Manufacturer Communication Number: PIC6076 Summary This Preliminary Information …
Diagnostic Tips oemdtc December 28, 2015 No Comments

Service High Voltage Charging System Message with DTC P1EDD Or P1EDC – 2014-2015 Chevrolet Volt & Cadillac ELR

2020 Chevrolet Tahoe
NHTSA ID Number: 10178355 Manufacturer Communication Number: PIT5649A   Summary This Preliminary …
Diagnostic Tips oemdtc October 15, 2020 No Comments

Rear Park Assist Chime Inoperative – 2015-2020 Chevrolet Tahoe

2015 Chevrolet Colorado
NHTSA ID Number: 10115103 Manufacturer Communication Number: PIT5382D Summary This Preliminary Information …
Diagnostic Tips oemdtc December 23, 2015 No Comments

Service Theft Deterrent Message In DIC and/or B2955 – 2015 Chevrolet Colorado & GMC Canyon

2018 Chevrolet Silverado
NHTSA ID Number: 10141372 Manufacturer Communication Number: PIT5507E   Summary This Preliminary …
Diagnostic Tips oemdtc October 19, 2016 No Comments

Service Park Assist Message At Start Up With DTC U0159 And/Or False Alerts – 2014-2016 Cadillac Chevrolet GMC

About The Author

oemdtc

Tags:1500 2014 2015 2016 C1114 Check Trailer Wiring Chevrolet GMC Integrated Trailer Brake Control System ITBC Service Trailer Brake System Sierra Silverado Suburban Tahoe Yukon

Leave a Reply

Cancel reply

CAPTCHA
Refresh

*

Search

Categories

Amazon Affiliate WordPress Plugin - Automatic Product Boxes and Bestseller-Lists for your blog

Archives

Newsletter

oemdtc.com

Recalls, Repair & Diagnostic Tips

File a Vehicle Safety Complaint with NHTSA


https://www-odi.nhtsa.dot.gov/VehicleComplaint/


Buick Cadillac Chevrolet GMC GM HUMMER Oldsmobile Pontiac Saturn Saab VIN Decoder


https://vpic.nhtsa.dot.gov/decoder/Decoder
 
OEMDTC is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
  • Disclaimer
  • Privacy Policy
  • About
Copyright © 2021 oemdtc.com
Theme by MyThemeShop.com

Ad Blocker Detected

Our website is made possible by displaying online advertisements to our visitors. Please consider supporting us by disabling your ad blocker.

Refresh