U0111 on 2019-2022 Land Rover Range Rover: MHEV BECM Communication Loss Explained

What's Unique About the 2019-2022 Land Rover RANGE ROVER

On these modern Range Rovers, especially Mild-Hybrid Electric Vehicle (MHEV) models, the electrical system is exceptionally complex. The Battery Energy Control Module (BECM) is a critical component managing the 48V battery that assists with acceleration and enables the start/stop system. Land Rover has issued multiple service bulletins (like N622) indicating that software errors are a primary cause for this communication loss, often causing 🎬 Watch: Understanding the U0111-11 fault code on Range Rovers the BECM to go offline. This makes it different from older vehicles where such a code would almost always point to a hardware or wiring failure. A specific wiring harness routing issue is also officially documented.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Generation note: The 2019-2022 year range covers the end of the L405 generation (2012-2022) and the beginning of the L460 generation (2022-present). The provided TSBs cover vehicles up to the 2022 model year, indicating the issue with the BECM and its software can affect both generations, particularly those equipped with MHEV systems which became prevalent in this period.

Symptoms You May Notice

• Check Engine Light (Malfunction Indicator Lamp, MIL) is on.
• Charge warning light is on.
• Start/Stop system is disabled or non-functional.
• Slight jerk or hesitation when accelerating from a stop.
• Inability for diagnostic tools to communicate with the BECM.
• "SOS system limited functionality" message may appear on the dash.

Most Likely Causes

1. Battery Energy Control Module (BECM) Software Glitch 🔴 High Probability Multiple official Land Rover TSBs (e.g., N622, SFCC_MAY2024_45/46) point to software errors that cause the BECM to go offline and stop communicating. This is the most widely acknowledged root cause.
   How to confirm: A Land Rover dealer or qualified independent shop must check for applicable software updates and service campaigns using the JLR Pathfinder diagnostic system against the vehicle's VIN.
   Typical fix: Update the BECM and/or PCM software to the latest version as specified by the manufacturer's service campaign.
   Est. part cost: $0 - $300 (if out of warranty)
2. Incorrect BECM Harness Routing 🟡 Medium Probability A specific service message (SSM 75783) notes that the BECM wiring harness can be routed incorrectly from the factory, putting tension on connector C4YB01D and causing a high-resistance or open circuit.
   How to confirm: Visually inspect the BECM wiring harness and connector C4YB01D, located near the 48V battery in the right rear cargo area, for signs of stress, tension, or damage.
   Typical fix: Re-route the harness to relieve tension and secure it with a new cable tie (specified as 200mm x 4.8mm in the TSB). Repair or replace the connector if it is damaged.
   Est. part cost: $5 - $50
3. Faulty Battery Energy Control Module (BECM) ⚪ Low Probability If software updates and wiring checks do not resolve the issue, the internal electronics of the module itself may have failed. This is a less common but definite possibility.
   How to confirm: After ruling out software and wiring, this is the default diagnosis. The module fails to communicate even after a forced software flash or a hard reset.
   Typical fix: Replace the BECM. The new module must be configured and programmed to the vehicle using specialized diagnostic tools. This is a costly repair.
   Est. part cost: $500 - $1200
4. Low State of Charge in 48V MHEV Battery ⚪ Low Probability If the vehicle is parked for an extended period (e.g., over 30 days), the 48V battery's charge can drop below a threshold (around 25%), causing the BECM to enter a self-preservation mode and stop communicating.
   How to confirm: Check the state of charge of the 48V battery using a capable scan tool. The code often appears after the vehicle has been sitting unused for a long time.
   Typical fix: Start the vehicle and allow the system to recharge the 48V battery by driving it. The fault may then need to be cleared with a scan tool.
   Est. part cost: $0

Rare But Worth Checking

• Poor Connection at 48V Battery: TSB SFCC_DEC2020_31 mentions that after a software update, it's critical to inspect the 48V battery cables and connectors for proper fit and seating, as a poor connection can mimic a failed module.
• Main 12V Battery Failure or Disconnect: A failing primary 12V battery can cause widespread, unpredictable communication errors. Additionally, some owners have reported that performing a 'hard reset' by disconnecting the main 12V battery for 10+ minutes can sometimes restore communication with the BECM and clear the code, at least temporarily.

Diagnosis Steps

1. Connect a professional scan tool (preferably JLR Pathfinder) and check for any TSBs or service campaigns (like N622) related to U0111 for the specific vehicle VIN.
2. If TSBs indicate a software update is available, perform the update for the BECM and/or PCM as instructed. This is the most common fix.
3. If the code persists, locate the 48V battery and BECM in the right-hand side of the cargo area. Inspect the BECM wiring harness for tension, damage, or corrosion, paying close attention to connector C4YB01D as mentioned in SSM 75783.
4. If the harness is tight, re-route it to create slack and secure with a cable tie.
5. Inspect the connectors at the 48V battery for a secure fit, as noted in TSB SFCC_DEC2020_31.
6. Test the main 12V battery and charging system to rule out low voltage as a cause of network instability.
7. As a last resort before module replacement, perform a hard reset by disconnecting the negative terminal of the 12V battery for at least 10 minutes, then reconnect and clear codes.
8. If all software, wiring, and battery checks are good, the BECM is likely faulty and requires replacement and programming.

Parts You'll Likely Need

• Battery Energy Control Module (BECM) (OEM #LR162955 (Note: This is for PHEV models and may differ from MHEV part, verify by VIN)) — This module is the source of the communication loss. If software and wiring fixes fail, the module itself needs to be replaced.
  Trusted brands: Land Rover (Genuine)
  OEM price range: $500-$1200
  Aftermarket price range: Not Recommended/Available. Used modules are VIN-locked and cannot be reprogrammed.

Technical Service Bulletins (TSBs) & Recalls

• SFCC_MAY2024_46: MIL on with U0111-00, loss of start/stop.
• SFCC_MAY2024_45: Battery enters offline state, MIL on with U0111-00.
• SFCC_DEC2020_31: PCM U0111-00 Lost Communication With Battery Energy Control Module 'A' after update. Recommends checking connections and performing a 12V battery reset.
• SSM 75783 (referenced in NHTSA doc): Incorrect BECM harness routing causing high resistance or open circuit at connector C4YB01D.
• N622 (Service Campaign): Widely referenced campaign to update BECM software to prevent the module from going offline.

Platform-Specific Known Issues

• A recall/service campaign (often cited as N622) was issued for 2019-2022 Range Rover and Range Rover Sport models to update the BECM software because the 48V MHEV battery could enter an offline state.
• TSB SFCC_MAY2024_46 mentions the MIL illuminating with code U0111-00 and loss of start/stop functionality.
• TSB SFCC_MAY2024_45 describes the battery entering an offline state, causing U0111-00.
• TSB SFCC_DEC2020_31 specifically calls out "Lost Communication With Battery Energy Control Module 'A'" after a software update, indicating procedural issues or loose connections can also trigger the code.
• Service message SSM 75783 identifies incorrect harness routing as a physical cause for an open circuit leading to code U0111. The fix involves re-routing the harness and securing it with a cable tie.

Mechanic-Grade Diagnostic Values

• CAN Bus Termination Resistance — expected: ~60 Ω (across CAN_H and CAN_L with battery disconnected). Failure: A reading of 120 Ω indicates an open circuit in the main CAN backbone harness. Significant deviation from 60 Ω suggests a wiring fault or a problem with a terminating module.
• CAN Bus Voltage (Idle/Recessive State) — expected: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (measured to ground). Failure: Significant deviation from 2.5V on either line when the bus is idle indicates a short or a faulty module pulling the line high or low.
• CAN Bus Voltage (Dominant State) — expected: CAN_H ≈ 3.5–3.9 V, CAN_L ≈ 1.1–1.5 V (measured to ground). Failure: Voltages outside these ranges during communication point to signal integrity issues.
• BECM Power Supply Voltage — expected: Stable 12.6 V with ignition ON.. Failure: A drop below 11 V under load can indicate an internal module issue or a problem with the power supply circuit.

Scan Tool Commands That Help

• JLR Pathfinder: 'Configure new battery energy control module' Service Routine — This function is mandatory after physically replacing the BECM. It downloads the vehicle-specific configuration and programs the new, virgin module to the car.
• JLR Pathfinder: BECM Software Update (via Service Campaign) — This is the primary fix when TSBs like N622 apply. The function updates the module's firmware to correct software errors that cause it to go offline.
• JLR Pathfinder: Post-Update Fuse Pull/Re-fit Procedure — Specifically for when U0111-00 appears *after* a software update. TSB SFCC_DEC2020_31 instructs to start the update again, remove the BECM fuse, and re-fit it ~20 seconds into the BECM update process to force a proper reset.
• JLR Pathfinder: Gateway Module (GWM) - Configure — If the GWM, which routes CAN messages, is suspected to be faulty or has been replaced, it must be configured. A faulty GWM can prevent communication with other modules like the BECM.

Wiring & Ground Locations

• BCM/GWM Assembly — Attached to a bracket, bolted to the passenger side of the cross-car beam, behind the instrument panel, adjacent to the Passenger Junction Box (PJB).. The Gateway Module (GWM) is part of this assembly and acts as the central router for CAN bus communications. A fault here or with its connections can isolate the BECM from the rest of the vehicle network, causing U0111.
• Main Battery Ground — Below the battery, inside the right frame rail.. A poor main ground connection can introduce electrical noise and voltage instability across the entire vehicle, leading to unpredictable communication faults between modules.
• BECM Location (MHEV) — Inside the 48V battery assembly, located in the right rear cargo area.. This is the location of the module itself. Access requires following high-voltage safety procedures and potentially removing the battery pack from the vehicle.

Real Owner Repair Stories

• Land Rover and Range Rover Forums user 'timc930' (2014-16 Range Rover SCV6 (L405 with Dual Battery Start/Stop)) — GWM and dashboard faults.
  ❌ Tried (didn't work) Initial troubleshooting showed incorrect voltage readings at the alternator field wire when connected to the GWM (8V instead of 12.5V).
  ✅ What actually fixed it The user identified high resistance (43 ohms) on a wire between the Gateway Module (GWM) connector C2531L-4 and another connector, C2725L-16. The final diagnosis was a wiring issue between the GWM and other components, not a faulty module itself.

OEM Part Supersession History

• lr070413 → LR079623 — Part revision or update.
  Heads up: This part is listed as 'Drive Motor Battery Pack Control Module' and fits 2022 Range Rover models with MHEV engines. Always verify part number by VIN before ordering.

Model Year Variations Within This Range

• 2022 (L460 Generation): The 2022 model year marks the introduction of the L460 generation. While it continues to use MHEV systems, component locations and access procedures may differ from the previous L405 generation. For example, emergency response guides for the L460 detail specific battery disconnect procedures for the new body style.