NHTSA ID Number: 10243474
Manufacturer Communication Number: TSB 23-2298
Summary
Some 2021-2023 Bronco Sport vehicles equipped with a 1.5L engine built on 24-Jul-2021 and through 31-Aug-2023 may exhibit a hissing noise from rear liftgate area when driving straight between 35-50 MPH (56 80 Km/h). This may be due to the absence of the rear floor insulator located in the spare tire compartment. To correct this condition, follow the Service Procedure to install a rear floor insulator in the spare tire compartment.
Model:
Ford
2021-2023 Bronco Sport | Engine: 1.5LBuilt on 24-Jul-2021 and through 31-Aug-2023 |
Issue: Some 2021-2023 Bronco Sport vehicles equipped with a 1.5L engine built on 24-Jul-2021 and through 31-Aug-2023 may exhibit a hissing noise from rear liftgate area when driving straight between 35-50 mph (56–80 km/h). This may be due to the absence of the rear floor insulator located in the spare tire compartment. To correct the condition, follow the Service Procedure to install a rear floor insulator in the spare tire compartment.
Action: Follow the Service Procedure to correct the condition on vehicles that meet all of the following criteria:
- 2021-2023 Bronco Sport
- 1.5L engine
- Built on 24-Jul-2021 and through 31-Aug-2023
- Hissing noise from rear liftgate area when driving straight between 35-50 mph (56-80 km/h).
Parts
| Service Part Number | Quantity | Description |
| LB5Z-7811516-A | 1 | Rear Floor Insulator |
Service Procedure
1. Perform a road test and accelerate the vehicle between 35-50 mph (56–80 km/h), switch the vehicle drive mode from normal to slippery. Is the hissing noise eliminated in slippery mode?
(1). Yes – proceed to Step 2.
(2). No – this article does not apply. Refer to Workshop Manual, Section 100-04 Noise, Vibration and Harshness > Diagnosis and Testing for normal diagnostics.
2. Remove the luggage compartment package cover (if equipped). (Figure 1)
Figure 1
3. Remove the luggage compartment floor covering. (Figure 2)
Figure 2
4. Remove the wing nut that secures the spare tire by turning it clockwise.
5. Remove the spare tire, jack and wrench from the spare tire compartment.
6. Install the rear floor insulator. (Figure 3)
Figure 3
7. To assemble the vehicle, reverse the removal procedure.
3 Affected Products
Vehicle
| MAKE | MODEL | YEAR |
| FORD | BRONCO SPORT | 2021-2023 |
1 Associated Document
Manufacturer Communications
23-2298
25 September 2023
MC-10243474-0001.pdf 187.264KB
NHTSA ID Number: 10239627
Manufacturer Communication Number: SSM 51808
Summary
Some 2021-2023 Bronco Sport vehicles equipped with a 1.5L engine and active torque coupling differential may exhibit a hissing noise from rear liftgate area when driving between 35 to 50 MPH (56-80 Km/h). This condition could be eliminated when the vehicle is driven in slippery mode. This condition does not affect the vehicle durability and no additional diagnosis or service is required for this condition at this time. Inform the customers that they can continue to drive the vehicle and engineering is currently working on a solution for this condition that is expected in September 2023. The replacement of the rear drive unit (RDU) is not recommended for this condition. Monitor OASIS for additional information and schedule a service appointment for customers once the repair becomes available.
1 Associated Document
Manufacturer Communications
SSM 51808
2021-2023 Bronco Sport – 1.5L – Active Torque Coupling Differential – Hissing Noise From Rear Liftgate Area When Driving Between 35-50 MPH (56-80 Km/h)
MC-10239627-0001.pdf 112.925KB
- SATISFIES REQUIREMENTS - for gear oil viscosity of SAE 75W80, 75W, 80W and 85W, as well as SAE 30 and SAE 10W30 motor oil
- APPLICATIONS - include differential oil, final drive oil, gear oil and transfer case fluid, this product is not designed for use in most manual transmissions or transaxles with synchronizers, as extreme slipperiness may cause shifting problems
- CONTAINS - additional friction modifiers for suitability with clutch-type limited slip differentials - for most LSDs, no additional friction modifiers are required, known formerly as LightWeight Gear Oil
- POPULAR GEAR OIL FOR - in many late model BMW, Dodge, Ford, GM, Jeep, Lexus, Mercedes-Benz, Ram, Toyota, also popular in many Formula racing transaxles, including Hewland LD-200 and FTR sequential
- WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises
- SATISFIES REQUIREMENTS - for gear oil viscosity of SAE 75W80, 75W, 80W and 85W, as well as SAE 30 and SAE 10W30 motor oil
- APPLICATIONS - include differential oil, final drive oil, gear oil and transfer case fluid, this product is not designed for use in most manual transmissions or transaxles with synchronizers, as extreme slipperiness may cause shifting problems
- CONTAINS - additional friction modifiers for suitability with clutch-type limited slip differentials - for most LSDs, no additional friction modifiers are required, known formerly as LightWeight Gear Oil
- POPULAR GEAR OIL FOR - in many late model BMW, Dodge, Ford, GM, Jeep, Lexus, Mercedes-Benz, Ram, Toyota, also popular in many Formula racing transaxles, including Hewland LD-200 and FTR sequential
- WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises
- API GL-5 GEAR OIL FOR DRIVETRAINS: Designed for differentials, transfer cases, and gear systems in a wide range of U.S., European, and Asian vehicles
- OEM SPECIFIC FORMULATION: Delivers performance equal to or better than OEM fluids, ensuring smooth gear operation, frictional stability, and gear functionality while preventing shuddering, sticking, and slipping
- OUTSTANDING EXTREME PRESSURE (EP) PROTECTION: Exceptional shear stability and friction control for seamless gear transitions, torque transfer, and superb performance in high horsepower, high-speed, sustained mechanical and thermal loads
- ADVANCED METAL PROTECTION: Formulated to protect brass, copper, and aluminum alloys, outperforming many OEM and premium brands in severe service conditions
- ALL-CLIMATE PERFORMANCE: Superior performance in both extreme heat and cold, down to -50°F, and supports lifetime fill unless otherwise specified by the manufacturer
- SATISFIES REQUIREMENTS - for gear oil viscosity of SAE 75W80, 75W, 80W and 85W, as well as SAE 30 and SAE 10W30 motor oil
- APPLICATIONS - include differential oil, final drive oil, gear oil and transfer case fluid, this product is not designed for use in most manual transmissions or transaxles with synchronizers, as extreme slipperiness may cause shifting problems
- CONTAINS - additional friction modifiers for suitability with clutch-type limited slip differentials - for most LSDs, no additional friction modifiers are required, known formerly as LightWeight Gear Oil
- POPULAR GEAR OIL FOR - in many late model BMW, Dodge, Ford, GM, Jeep, Lexus, Mercedes-Benz, Ram, Toyota, also popular in many Formula racing transaxles, including Hewland LD-200 and FTR sequential
- WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises
- FlexFill squeezable pouch releases 2X more fluid with less effort for 3X faster filling vs. traditional bottle packaging
- Contains limited slip for optimal performance of the clutch pack, while also delivering 30% better protection against towing and heavy loads and 1.5X better gear wear protection
- Advanced full synthetic helps prevent noise and reduce chattering, while protecting gear teeth from wearing out prematurely
- High and low temperature protection ranges from -50F to 300F degrees for cold temperature fluidity and high temperature performance
- Fights rust and corrosion with corrosion inhibitors and safeguards against impurities, oxidation and thermal breakdown
Last update on 2026-06-04 / Affiliate links / Images from Amazon Product Advertising API
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TECHNICAL SERVICE BULLETIN
1.5L – Hissing Noise From Rear Liftgate Area When Driving Straight Between 35-50 MPH (56-80 Km/h)
23-2298
25 September
2023 Model:
Ford
2021-2023 Bronco Sport Engine: 1.5L
Built on 24-Jul-2021 and through 31-Aug-2023 Issue: Some 2021-2023 Bronco Sport vehicles equipped with a 1.5L engine built on 24-Jul-2021 and through 31- Aug-2023 may exhibit a hissing noise from rear liftgate area when driving straight between 35-50 mph (56–80 km/h). This may be due to the absence of the rear floor insulator located in the spare tire compartment. To correct the condition, follow the Service Procedure to install a rear floor insulator in the spare tire compartment.
Action: Follow the Service Procedure to correct the condition on vehicles that meet all of the following criteria:
• 2021-2023 Bronco Sport
• 1.5L engine
• Built on 24-Jul-2021 and through 31-Aug-2023
• Hissing noise from rear liftgate area when driving straight between 35-50 mph (56-80 km/h).
Parts
Service Part Number Quantity Description
LB5Z-7811516-A 1 Rear Floor Insulator
Warranty Status: Eligible under provisions of New Vehicle Limited Warranty (NVLW)/Service Part Warranty (SPW)/Special Service Part (SSP)/Extended Service Plan (ESP) coverage. Limits/policies/prior approvals are not altered by a TSB. NVLW/SPW/SSP/ESP coverage limits are determined by the identified causal part and verified using the OASIS part coverage tool.
Labor Times Description 2021-2023 Bronco Sport 1.5L: Install The Rear Floor Insulator, Includes Time For Road Test (Do Not Use With Any Other Labor Operations) Operation No.
232298A Time 0.5
Hrs.
Repair/Claim Coding
Causal Part: 7811516
Condition Code: 39
Service Procedure
1. Perform a road test and accelerate the vehicle between 35-50 mph (56–80 km/h), switch the vehicle drive mode from normal to slippery. Is the hissing noise eliminated in slippery mode?
(1). Yes – proceed to Step 2.
(2). No – this article does not apply. Refer to Workshop Manual, Section 100-04 Noise, Vibration and Harshness > Diagnosis and Testing for normal diagnostics.
2. Remove the luggage compartment package cover (if equipped). (Figure 1)
Figure 1 3. Remove the luggage compartment floor covering. (Figure 2) Figure 2 4. Remove the wing nut that secures the spare tire by turning it clockwise.
5. Remove the spare tire, jack and wrench from the spare tire compartment.
6. Install the rear floor insulator. (Figure 3) Figure 3 7. To assemble the vehicle, reverse the removal procedure.
© 2023 Ford Motor Company All rights reserved.
NOTE: The information in Technical Service Bulletins is intended for use by trained, professional technicians with the knowledge, tools, and
equipment to do the job properly and safely. It informs these technicians of conditions that may occur on some vehicles, or provides information that could assist in proper vehicle service. The procedures should not be performed by “do-it-yourselfers”. Do not assume that a condition described affects your car or truck. Contact a Ford or Lincoln dealership to determine whether the Bulletin applies to your vehicle. Warranty Policy and Extended Service Plan documentation determine Warranty and/or Extended Service Plan coverage unless stated otherwise in the TSB article. The information in this Technical Service Bulletin (TSB) was current at the time of printing. Ford Motor Company reserves the right de this information with updates. The most recent information is available through Ford Motor Company’s on-line technical resources.
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