NHTSA service bulletin

NHTSA Service Bulletin 11020178: 2023-2025 Harley-davidson Flhx

Official manufacturer communication context for 2023-2025 Harley-davidson Flhx, with affected products, buyer checks and links into Carchieve recall, problem and VIN research.

NHTSA service bulletin 11020178 summary graphic for 2023-2025 Harley-davidson Flhx
11020178NHTSA document ID
Warranty program / extensioncommunication type
7affected product rows
90/100quality score

Reviewed June 2026 from NHTSA manufacturer communication and service bulletin records. Carchieve is independent and not affiliated with any vehicle manufacturer or government agency.

Quick answer

SERVICE BULLETIN M1691: LINKED BRAKING FUNCTIONAL IMPROVEMENT. PURPOSE: Initial Release. This bulletin inform dealers that there is an Electro Hydraulic Control Unit (EHCU) update available. This update is to improve functionality of the Linked Braking System. Linked Braking allows for more balanced front and rear braking under a wide variety of brake applications. At speeds greater than 20 mph (32 km/h), the system dynamically adjusts the linking to achieve better braking balance, as compared to single input braking. The EHCU update improves Linked Braking with optimized front and rear brake proportioning while only the rear brake is being applied by the rider. This software update is to address a possible customer concern related to the smoothness of brake engagement during a linked braking event when only rear brake is applied. If a customer has concerns on this Linked Braking operation under these conditions, this improvement update can be applied. NOTE: For vehicles within factory warranty and concern is present, submit a warranty claim per Table 4.

What this bulletin may mean before buying

Treat this as service research, not a verdict on one car. Before you buy, compare this communication with official recall campaigns, model-level owner complaint patterns, and the exact vehicle’s VIN-decoded specifications. A bulletin can help you ask a seller or dealer sharper questions about software updates, known repairs, warranty extensions and service history.

Affected products listed in this communication

MakeModelModel yearsBuyer note
Harley-davidsonFlhx2024, 2025Ask for service records and run the exact VIN before purchase.
Harley-davidsonFlhxse2023, 2024Ask for service records and run the exact VIN before purchase.
Harley-davidsonFlhxu2025Ask for service records and run the exact VIN before purchase.
Harley-davidsonFltrx2024, 2025Ask for service records and run the exact VIN before purchase.
Harley-davidsonFltrxrrse2025Ask for service records and run the exact VIN before purchase.
Harley-davidsonFltrxse2023-2025Ask for service records and run the exact VIN before purchase.
Harley-davidsonFltrxstse2024, 2025Ask for service records and run the exact VIN before purchase.

Buyer checklist

  1. Run the 17-character VIN and confirm the year, make, model, engine and equipment match the listing.
  2. Check recall campaign pages for safety actions that may require dealer repair.
  3. Compare this bulletin with common problem pages for the same model and component area.
  4. Ask the seller or dealer whether the bulletin procedure, update or inspection has already been completed.
  5. Use the used-car buying checklist and get an independent inspection.

Frequently asked questions

What is NHTSA service bulletin 11020178?

SERVICE BULLETIN M1691: LINKED BRAKING FUNCTIONAL IMPROVEMENT. PURPOSE: Initial Release. This bulletin inform dealers that there is an Electro Hydraulic Control Unit (EHCU) update available. This update is to improve functionality of the Linked Braking System. Linked Braking allows for more balanced front and rear braking under a wide variety of brake applications. At speeds greater than 20 mph (32 km/h), the.

Is a service bulletin the same as a recall?

No. A recall is a safety campaign with a required remedy for affected VINs. A service bulletin or manufacturer communication usually describes diagnostic, repair, software, warranty or service information.

How should a used-car buyer use this bulletin?

Use it as a research signal. Compare it with recalls, owner complaints, service records, a VIN report and an independent inspection before buying.

Check the exact VIN before you buy

Model-level pages show public safety patterns. A full VIN report helps confirm the exact vehicle, decoded specs, recall applicability and buyer checks.

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