The Audio Amplifier Module itself may have an internal hardware fault that is grounding the signal internally. Troubleshooting and Fixes

The amplifier uses an engine speed (RPM) signal for features like Active Noise Cancellation (ANC) or Speed Dependent Volume Control . If the amplifier cannot "see" this signal because the circuit is grounded, it triggers this DTC (Diagnostic Trouble Code). Common Symptoms

Multiple unrelated dashboard warnings if the fault is caused by a broader battery issue.

Unlike a mechanical failure, this code might not always cause a "Check Engine" light. Instead, you may notice:

In the Land Rover diagnostic language, code is defined as: "Engine Speed Input - Circuit short to ground" .