Land Rover B1d9f11 2021 Jun 2026

Disconnect the wiring harness from the amplifier and the central gateway module.

The wiring connecting the Audio Amplifier Module to the engine control modules can become chaffed, pinched, or damaged, exposing the copper wire and causing it to short out against the vehicle's metal chassis.

Working on the electrical system of a 2021 Land Rover requires a JLR-compatible bi-directional scanner (GAP IIDTool, Autel, or dealer-level SDD). Do not rely on generic OBD2 code readers. land rover b1d9f11 2021

: The Audio Amplifier Module is reporting that it has lost the signal that tells it how fast the engine is running (the crank signal).

: If the code is permanent, a technician will need to test the audio amplifier module crank signal input for high resistance or a direct short. Are you experiencing any specific audio glitches warning lights on your dashboard along with this code? Disconnect the wiring harness from the amplifier and

Screen freezing, reboots, or failure to turn on.

The module identifies a disruption or lack of a plausible signal coming from the engine's crank speed sensor to the amplifier module. Do not rely on generic OBD2 code readers

Because this code relates to the engine speed input and ground integrity, the symptoms are rarely just a check engine light. Owners and technicians have reported the following behaviors:

: This signal is often used for features like speed-dependent volume or "Active Sound Design" (which pumps synthetic engine noise into the cabin).