Often, the micro-switch inside the latch is physically stuck.
The Land Rover fault code specifically indicates an " Engine speed input - Circuit short to ground " within the Audio Amplifier Module (AAM) . land rover b1d9f-11
Here’s a breakdown:
If your battery is old (more than 3–4 years), fails a load test, or has low resting voltage (below 12.3V), replace it with a high-quality AGM (Absorbent Glass Mat) battery of the correct specification for your Land Rover model. After installation, be sure to use your diagnostic tool to "reprogram" the new battery, letting the vehicle know a new one has been installed. A forum member reported that after doing this, the B1D9F-11 code persisted, so a battery replacement may not be a standalone fix if other issues exist. However, starting with a known-good battery eliminates it as a variable. Often, the micro-switch inside the latch is physically stuck
Let’s decode that:
You might occasionally see this code paired with or replaced by sub-code . Understanding the distinction helps target your electrical testing tools: Fault Sub-Code Circuit Diagnosis Type Typical Root Problem B1D9F-11 Open Circuit Damaged CAN wires, unplugged pins, module offline B1D9F-13 Short Circuit to Ground After installation, be sure to use your diagnostic