# Service bulletin SSM 51321

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: 10230964
- Published by NHTSA: 2023\-02\-02
- Manufacturer's number: SSM 51321
- Manufacturer's date: 2023\-01\-30
- NHTSA component: EQUIPMENT:ELECTRICAL; EXTERIOR LIGHTING:HEADLIGHTS

## NHTSA's summary

Some 2018\-2022 Expedition vehicles may exhibit a condition of intermittent headlamp operation while the vehicle is OFF and have diagnostic trouble code \(DTC\) B1533 stored in the body control module \(BCM\). This may be due to the internal logic within the headlamp switch. Switch and/or module replacement will not resolve this condition. Headlamp operation is not affected while the vehicle is ON. A new headlamp switch is currently under development to correct this condition. Let the customer know they can continue to drive the vehicle and schedule a follow\-up appointment in May 2023, when parts are expected to become available. Follow up with the customer to confirm the appointment once OASIS is updated with the repair information.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10230964-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10230964-9999.pdf)

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

## Components

Equipment and accessories, Lighting, Headlights

## Trouble codes named

B1533

## Vehicles listed

- 2018 to 2022 FORD EXPEDITION

JSON: [/v1/bulletins/10230964](/v1/bulletins/10230964)

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