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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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10144538
Published by NHTSA2018-09-17
Manufacturer's numberSSM73933
Manufacturer's date2018-07-12
NHTSA componentEQUIPMENT; ELECTRICAL SYSTEM; EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL

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

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, Equipment and accessories, Software

Vehicles listed
LAND ROVER RANGE ROVER2018

Listing a model year does not mean every vehicle of it is concerned: the document says which.

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RCTR_29JAN20_232020-02-07. Service bulletin. Noise From Dynamic Suspension
Tech_RS_NOV19_772019-12-07. Service bulletin. Check Engine lamp illuminated with DTC P2002-00 stored in the PCM which requires DPF replacement
SFCC_NOV19_402019-12-07. Service bulletin. Customer states the vehicle will not start.