# Service bulletin PIT5509L

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.

- Type: Service bulletin
- NHTSA id: 11007691
- Published by NHTSA: 2024\-09\-11
- Manufacturer's number: PIT5509L
- Manufacturer's date: 2024\-09\-11
- NHTSA component: SERVICE BRAKES

## 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

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2024/MC-11007691-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2024/MC-11007691-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Brakes

## Trouble codes named

C1114

## Vehicles listed

- 2021 to 2024 CADILLAC ESCALADE
- 2015 to 2024 CHEVROLET COLORADO
- 2014 to 2024 CHEVROLET SILVERADO 1500
- 2015 to 2022 CHEVROLET SUBURBAN
- 2024 CHEVROLET SUBURBAN
- 2015 to 2024 CHEVROLET TAHOE
- 2015 to 2024 GMC CANYON
- 2014 to 2024 GMC SIERRA 1500
- 2015 to 2024 GMC YUKON

## Recalls for the same vehicles and component

- [25V768000](/recalls/nhtsa/25V768000.md), 2025-11-06: SERVICE BRAKES, HYDRAULIC:POWER ASSIST
- [25V390000](/recalls/nhtsa/25V390000.md), 2025-06-12: SERVICE BRAKES, HYDRAULIC:BRAKE FLUID LOW WARNING:SWITCH/SENSOR/FLOAT
- [24V674000](/recalls/nhtsa/24V674000.md), 2024-09-12: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:ELECTRIC:CONTROL MODULE:SOFTWARE; SERVICE BRAKES, HYDRAULIC:BRAKE FLUID LOW WARNING: LAMP
- [2024114](/recalls/tc/2024114.md), 2024-02-22: Brakes
- [2021602](/recalls/tc/2021602.md), 2021-09-29: Brakes
- [21V758000](/recalls/nhtsa/21V758000.md), 2021-09-29: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:ELECTRIC:CONTROL MODULE
- [21V579000](/recalls/nhtsa/21V579000.md), 2021-07-29: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:ELECTRIC:CONTROL MODULE:SOFTWARE
- [2020459](/recalls/tc/2020459.md), 2020-10-01: Brakes
- [20V603000](/recalls/nhtsa/20V603000.md), 2020-10-01: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM
- [2020079](/recalls/tc/2020079.md), 2020-02-27: Brakes

## Other bulletins for the same vehicles and component

- [N252521980\-01](/bulletins/11024688.md), 2025-10-31, Service campaign: SERVICE BRAKES. Certain vehicles listed above, may have a condition in which the Brake System Control Module does not have the latest software. Dealers are to reprogram the Brake System Control Module.
- [N252521980](/bulletins/11024420.md), 2025-10-22, Service campaign: SERVICE BRAKES. Certain vehicles, may have a condition in which the Brake System Control Module does not have the latest software. Dealers are to reprogram the Brake System Control Module.
- [23\-NA\-201](/bulletins/11024378.md), 2025-10-21, Service bulletin: SERVICE BRAKES; ELECTRICAL SYSTEM; STEERING. This service bulletin advises the technician of a possible loose ground that may be causing customer concerns of Loss of Steering Assist and/or Loss of Brake Assist and Malfunction Indicator Lamp \(MIL\) Illuminated.
- [25\-NA\-065](/bulletins/11017173.md), 2025-04-24, Service bulletin: STEERING; SERVICE BRAKES; FUEL/PROPULSION SYSTEM. This informational bulletin instructs the tech when fuel/fluid is needed to be tested and where it can be sent for analysis.
- [25\-NA\-064](/bulletins/11017097.md), 2025-04-17, Service bulletin: SERVICE BRAKES. This informational bulletin provides information on the brake system warning lamp illuminated on driver information center \(DIC\), brake pedal goes closer to the floor and/or is harder to push.
- [PIT6347A](/bulletins/11015642.md), 2025-03-17, Service bulletin: SERVICE BRAKES. This Preliminary information communicates an issue with ABS SES MIL / Service Brake System / Service StabiliTrak / BSCM DTC P0606 P0562 and dealers to perform additional battery and connection testing.
- [PIT6347](/bulletins/11014624.md), 2025-03-02, Service bulletin: SERVICE BRAKES. This Preliminary information communicates an issue with ABS SES MIL / Service Brake System / Service StabiliTrak / BSCM DTC P0606 P0562 and engineering is currently investigating.
- [24\-NA\-048](/bulletins/11014277.md), 2025-02-17, Service bulletin: FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING; SERVICE BRAKES. This service bulletin provides customer information for rear unwanted automatic braking, usually when reversing out of a garage or driveway.
- [21\-NA\-043](/bulletins/11014230.md), 2025-02-12, Service bulletin: VISIBILITY/WIPER; SERVICE BRAKES; ENGINE; ELECTRICAL SYSTEM; WHEELS. 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.
- [25\-NA\-019](/bulletins/11014138.md), 2025-02-11, Service bulletin: WHEELS; VEHICLE SPEED CONTROL; AIR BAGS; ELECTRICAL SYSTEM; SERVICE BRAKES. This bulletin advises the tech to check other areas that may need repair before replacing the wheel speed sensor.

JSON: [/v1/bulletins/11007691](/v1/bulletins/11007691)

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