NHTSA ID Number: 10059079
Manufacturer Communication Number: PIT-5449
Summary
GMC/CHEVROLET: ON SOME TRUCKS, MESSAGE APPEARS IN DIC REGARDING SYMPTOM OF AN INTERMITTENT SERVICE TRAILER BRAKE AND DIAGNOSTIC TROUBLE CODES (DTC) ARE SET IN CHASSIS CONTROL MODULE. MODEL 2014 SILVERADO 1500, SIERRA 1500, 2015 SIERRA, SILVERADO.
4 Affected Products
Vehicles
SEOCONTENT-START
Bulletin No.: PIT5449
Date: August, 2015
| Subject: | Diagnostic Tip – Service Trailer Brake Message With DTC C1115 C1116 C1117 Or C1118 |
| Models: | 2014 Chevrolet Silverado 1500 |
| 2015 Chevrolet Silverado | |
| 2014 GMC Sierra 1500 | |
| 2015 GMC Sierra |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern
Some owners may comment of an intermittent Service Trailer Brake message on the DIC. When scanning the truck for DTC’s, a C1115, C1116, C1117 and/or C1118 will be set in the Chassis Control Module.
GDS can be used to view the following Trailer Brake Control Switch parameters in the Chassis Control Module:
- Manual Trailer Brake Apply Request Signal 1
- Manual Trailer Brake Apply Request Signal 2
- Trailer Brake User Gain Switch
Below are the normal working ranges for the Trailer Brake Control Switch parameters:
- Manual Apply Slide Lever Fully Applied
Manual Trailer Brake Apply Request Signal 1 89% (+/- 5%)
Manual Trailer Brake Apply Request Signal 2 11% (+/- 5%)
- Manual Apply Slide Lever Fully Released
Manual Trailer Brake Apply Request Signal 1 11% (+/- 5%)
Manual Trailer Brake Apply Request Signal 2 89% (+/- 5%)
- User Gain Switch
Switch at rest = 89% (+/- 5%)
” + ” switch pressed = 37% (+/- 5%)
” – ” switch pressed = 23% (+/- 5%)
Recommendation/Instructions
In most cases, the Chassis Control Module is NOT the root cause of the DTC’s and there is either a concern with the wiring to the trailer brake control switch or the switch itself.
The wiring between the Chassis Control Module and trailer brake control switch passes through in-line connector X185 or X138 (varies with vehicle build; refer to SI), as well as the X1 and X5 connectors of the X61A Junction Block-I/P.
Please inspect the wiring from the Chassis Control Module to the trailer brake control switch, paying close attention to these connectors for any backed out, loose, poor tension, etc. terminal/connector issues.
If no issues are found, the mostly like issue is with the trailer brake control switch.
Tip: The trailer brake control switch parameters can be monitored with the scan tool while wiggling the circuits/harness between the Chassis Control Module and switch looking for the values to change.
Warranty Information
Please refer to latest version of bulletin 10-00-89-005 for warranty information on wire/connector repairs.
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.
SEOCONTENT-END
Bulletin No.: PIT5449
Date: August, 2015
To View or Download this Document Click Here
- 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
- Slim, low-profile design for a functional, modern aesthetic
- Unique bracket system for improved dash clearance
- Fully adjustable power and ramp time
- Operates 2-6 trailer brakes at a time (1-3 axles)
- No internal moving parts and no leveling required
- 【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
- 🏆【PROPORTIONAL ELECTRIC BRAKE CONTROLLER】Lrichy brake controller uses internal sensors to automatically apply trailer brakes based on your tow vehicle's braking intensity and speed. It intelligently sets the correct braking level and adjusts for hills, delivering reliable stopping power in any situation
- 🏆【WIDE COMPATIBILITY】This proportional controller replaces the Brake-EVN 8508220 and has Smoother braking than the 8507111 Time-Delay Brake IV. It's compatible with various vehicles including Ford, GM, Chevy, Dodge, RAM, Toyota, Jeep, and more with 2, 4, 6, and 8 brakes (1-4 axles). NOTE: Vehicle-Specific Plug & Play Harness Not Included
- 🏆【SIMPLE SETUP & USE】A detailed instruction manual with an easy-to-read LED digital display makes it easy to show settings, real-time diagnostic information, and alarms. For manual braking, simply move the manual lever to the left. Braking force will be applied to the trailer braking system based on the previously set braking force
- 🏆【EASY MOUNTING】Includes brackets and screws for simple installation. Features a plug-and-play port for easy disconnection
- 🏆【SATISFACTION GUARANTEE】Lrichy attaches great importance to product quality and customer shopping experience! We provide 2 Years of warranty service and a refund for product quality issues! If you have any problems, you can contact us via Amazon! Free exchange and refund policy for a truly hassle-free after-sales service!
- ✨ Proportional Braking System: Ensures smooth, consistent stops by applying trailer brakes in proportion to your vehicle's braking intensity. Ideal for all trailer types, from light utility to heavy-duty.
- ✨ Clear Digital Display: Easy-to-read screen provides real-time brake settings and connection status. Continuous diagnostics alert you to issues instantly for quick resolution.
- ✨ Customizable Braking: Adjust braking power with the manual override lever and three boost settings. Perfect for varying towing loads and driving conditions.
- ✨ Easy Installation: Plug-and-play wiring and flexible mounting options (snap-in clip or bracket) allow for quick setup within a 180-degree range.
- ✨ Reliable Performance: Built with self-leveling tech and advanced circuit protection. Backed by lifetime service and a no-hassle return policy for worry-free towing.
This product presentation was made with AAWP plugin.