# Service bulletin SSM73933

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: 10148474
- Published by NHTSA: 2018\-11\-13
- Manufacturer's number: SSM73933
- Manufacturer's date: 2018\-07\-12
- NHTSA component: EQUIPMENT; ELECTRICAL SYSTEM

## NHTSA's summary

Issue: A customer may report an audible sound \(groan type noise\) from under bonnet immediately after the vehicle is unlocked and the vehicle stationary. The sound will extinguish after several seconds and is generated by the Acoustic Vehicle Alert System \(AVAS\) sounder fitted to Plug\-in Hybrid Electric Vehicles \(PHEV\). The AVAS is located behind the grille at the front of the vehicle. Cause: Software error in the Audio Amplifier Module \(AAM\) related to a communication timing error during wake up when vehicle is unlocked.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2018/MC-10148474-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2018/MC-10148474-0001.pdf)

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

## Components

Electrical system, Equipment and accessories

## Vehicles listed

- 2018 LAND ROVER RANGE ROVER

## Other bulletins for the same vehicles and component

- [SSM76411 \- 10MAR26](/bulletins/11030751.md), 2026-04-06, Other: ELECTRICAL SYSTEM. Smart Key Deactivated message on instrument cluster and unable to start their vehicle
- [TUCC\_APR2025\_18](/bulletins/11017740.md), 2025-05-05, Other: ELECTRICAL SYSTEM. Leaking windshield that caused the water ingress on the electrical component.
- [SFCC\_OCT2024\_50](/bulletins/11010196.md), 2024-11-07, Other: ELECTRICAL SYSTEM. The instrument panel may display an amber High Voltage \(HV\) system warning message \& a Malfunction Indication Lamp \(MIL\) at the end of a charging cycle before the charging cable is removed.
- [SFCC\_AUG2024\_24](/bulletins/11007176.md), 2024-09-06, Other: ELECTRICAL SYSTEM. concern has been identified on certain JLR vehicles, where the Body Control Module \(BCM\) does not fully meet US importation requirements. The requires BCM replacement with a new component which fully meets the US importation requirements.
- [BIG5MAR24\_34b](/bulletins/10252743.md), 2024-04-05, Service bulletin: FUEL SYSTEM, DIESEL; ENGINE AND ENGINE COOLING:ENGINE:DIESEL; EQUIPMENT. A concern has been identified where on certain vehicles equipped with TDV6 3.0L Diesel and Ingenium I4 2.0L Diesel engines, when connected to a diagnostic scan tool during the California SMOG test, the Powertrain Control Module \(PCM\) incorrectly reports the monitor readiness status as 'not supported'. A software update to the PCM is needed.
- [N808 ER v1](/bulletins/10251543.md), 2024-03-08, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); POWER TRAIN. Certain 2017 to 2019 Land Rover vehicles equipped with TDV6 3.0L Diesel engines and Ingenium I4 2.0L Diesel engines, when connected to a diagnostic scan tool during the California SMOG test, the Powertrain Control Module \(PCM\) incorrectly reports the monitor readiness status as not supported.
- [SFCC\_DEC2023\_32](/bulletins/10248408.md), 2024-01-09, Service bulletin: ELECTRICAL SYSTEM; EQUIPMENT. Due to time required to complete in shop vehicle set up and workflow for Audio loss, it has been found that workflow may provide false result if IMC is not in a faulted state when workflow is run to identify potential Polar Switch Firmware fault.
- [SFCC\_NOV2023\_30](/bulletins/10246319.md), 2023-12-07, Service bulletin: ELECTRICAL SYSTEM. Startup battery keeps draining / Vehicle will not start
- [WACCSEP23\_6](/bulletins/10243682.md), 2023-10-06, Service bulletin: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; ELECTRICAL SYSTEM. Battery low warning displayed on instrument cluster and/or no\-start
- [SSM75869](/bulletins/10242071.md), 2023-09-08, Service bulletin: ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. Coolant Low Warning Message Displayed On The Instrument Panel Cluster

JSON: [/v1/bulletins/10148474](/v1/bulletins/10148474)

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