The 2021 model year was a transitional period for Land Rover. During this time, JLR introduced:

These systems share the same LIN bus (Local Interconnect Network) and body control modules. The B1D9F11 fault most frequently appears in vehicles built between March 2020 and September 2021. During this window, a batch of interior light assemblies (Part No. LR146302 and LR146303) had substandard internal soldering, leading to moisture ingress and internal short circuits.

While Land Rover uses specific proprietary codes, the structure of B1D9F11 breaks down as follows:

Most Likely Interpretation: This code is frequently associated with the Driver Information System or Instrument Cluster, specifically indicating a loss of communication or a circuit fault with the Driver Information Module (DIM) or the Active Safety Display.

Note: On some 2021 models equipped with the "ClearSight" interior rear-view mirror, similar codes can relate to the display mirror control module.

Note: The seat occupancy sensor is a safety-critical component. Do not bypass or disable it — airbag performance will be compromised.

Repair costs vary widely depending on the root cause and whether you use an independent specialist versus a main dealer.

| Repair Scenario | Parts Cost | Labor Cost | Total (USD) | |----------------|------------|------------|--------------| | Overhead console replacement (DIY) | $120–$180 (used/remanufactured) | $0 | $120–$180 | | Overhead console (Independent shop) | $220 (new OEM) | $150 | $370 | | Overhead console (Land Rover dealer) | $320 (revised part) | $250 | $570 | | Door handle light replacement (Dealer) | $85 per handle | $200 | $285 | | Wiring repair (A-pillar chafe) | $10 (tape/sleeve) | $300 (diagnosis + repair) | $310 |

Important: If your 2021 Land Rover is still within the New Vehicle Limited Warranty (4 years / 50,000 miles) , code B1D9F11 is covered. Given that 2021 models were sold from mid-2020 through late 2021, many are still under warranty. Do not pay for this repair if you are under 50,000 miles.

The Land Rover B1D9F11 fault code in a 2021 model is, in nearly all cases, an inconvenient but inexpensive electronic nuisance rather than a catastrophic failure. It signals a short to ground—most likely in the overhead interior light assembly or driver’s door handle illumination.

Owners with basic DIY skills and a $50 multimeter can often resolve it by replacing the overhead console with a revised part. For everyone else, a one-hour diagnostic at an independent Land Rover specialist (or a warranty claim at the dealer) will put the issue to rest.

Remember: Do not ignore this code. The underlying short circuit will slowly drain your battery and, in rare cases, can overheat the LIN bus wiring, leading to more expensive repairs down the line. Address B1D9F11 promptly, and your 2021 Land Rover will continue to deliver the luxury and off-road capability you bought it for.

Have you encountered B1D9F11 on your 2021 Land Rover? Share your repair experience in the comments below.

To understand the code, we must break down its structure:

Put simply: B1D9F11 indicates that a component on the vehicle’s body control network—most commonly an Interior Light, Door Handle Light, or Puddle Lamp—has developed an electrical short to the vehicle’s ground circuit. The “2021” reference is crucial because mid-2020 to 2021 models saw a major electrical architecture overhaul (moving to the new Electrical Vehicle Architecture, or EVA 2.0).