# Service bulletin PS546

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: 10133171
- Published by NHTSA: 2018\-04\-16
- Manufacturer's number: PS546
- Manufacturer's date: 2018\-03\-01
- NHTSA component: BACK OVER PREVENTION; ELECTRONIC STABILITY CONTROL \(ESC\)

## NHTSA's summary

PITSTOP \- ELECTRONIC STABILITY CONTROL SELF\-CHECK NOISE \- This Pitstop provides information regarding a concern related to a single faint ?thud? type noise heard from the engine compartment at speeds of 18\-20 MPH after initial start\-up. Be aware that the Electronic Stability Control \(ESC\) system performs it?s self\-check under these conditions. This single faint ?thud? type noise is normal and indicates that the ESC is functioning properly.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2018/MC-10133171-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2018/MC-10133171-0001.pdf)

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

## Components

Driver assistance, Backup camera

## Vehicles listed

- 2017 to 2018 KIA SPORTAGE

## Other bulletins for the same vehicles and component

- [PS797](/bulletins/11026698.md), 2025-12-18, Other: BACK OVER PREVENTION: WARNINGS. PITSTOP: TECHNICAL OPERATIONS: EXTERNAL DAMAGE TO ULTRASONIC SENSOR: This Pitstop provides information related to Parking Distance Warning \(PDW\) alerts and repairs involving ultrasonic sensors. The PDW system alerts the driver while parking, by calculating distance based on the difference in signal transmission and reception times between the vehicle \(ultrasonic sensor\) and an object. The membrane film of the ultrasonic sensor is used for object detention and can be damaged by stone chips or foreign substances while driving. Damage to the cover of the ultrasonic sensor can also lead to damage to the internal circuit. As a result of this external damage, the PDW system may not receive the proper signal from the ultrasonic sensor. In some cases, the system may cause a false alarm, no alert, or phantom warnings by a “Warning Lamp’ to be displayed on the cluster. The ultrasonic sensor membrane film should be always inspected for external damage and if any part replacement should be treated as a general repair, not as a warranty claim repair for this concern. \(Please note that this Pitstop only applies to models/trims that are equipped with the ultrasonic sensors.\)
- [PS551](/bulletins/10133175.md), 2018-04-16, Service bulletin: BACK OVER PREVENTION; LATCHES/LOCKS/LINKAGES:TRUNK LID:LOCK. PITSTOP \- RATTLE NOISE FROM REAR OF THE VEHICLE \(PS551\) \- This Pitstop contains information regarding a rattle type noise heard from the rear of the vehicle when closing a door or trunk on some 2016MY\-2018MY vehicles.

JSON: [/v1/bulletins/10133171](/v1/bulletins/10133171)

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