C2006 on 2017-2018 Land Rover Range Rover: Left Parking Brake Actuator Fault Explained

What's Unique About the 2017-2018 Land Rover RANGE ROVER

On the L405 generation Range Rover, this code is part of a well-documented issue where a software sensitivity can trigger a 'Park Brake needs Calibration' message and log multiple actuator faults at once (C2005, C2006, C2007, C2008). This can happen if an EPB release command is immediately interrupted by an apply command, for instance, if the driver's door is ajar when shifting into Drive or the Park button is pressed too quickly. Because of this known software issue detailed in TSB SSM74004, diagnosis should always start with a simple recalibration procedure before assuming a hardware failure.

Diagnostic Flowchart

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

Symptoms You May Notice

• "Park Brake Fault" or "Park Brake needs Calibration" message on the dashboard.
• Red parking brake warning light is on or flashing.
• Inability to apply or release the Electronic Parking Brake.
• A grinding or screeching noise from the rear of the vehicle when operating the parking brake.
• Vehicle rolls slightly after the parking brake is engaged.

Most Likely Causes

1. ABS Control Module Software Error 🔴 High Probability Land Rover TSB SSM74004 explicitly states the software monitoring the EPB actuators can get confused if a release command is immediately interrupted by an apply command (e.g., opening a door while shifting into Drive). This logs the full cluster of C2005/C2006/C2007/C2008 codes without a true hardware fault.
   How to confirm: Check if codes C2005-71, C2006-71, C2007-72, and C2008-72 are all present simultaneously. If so, a software glitch is the most likely cause.
   Typical fix: Perform the EPB recalibration procedure from TSB SSM74004: Switch off and lock the vehicle for ten minutes. Unlock, start the engine, press the foot brake, press the EPB switch down (release) for 2 seconds, then pull up (apply) until the red 'P' symbol is solid. If this fails, a dealer software update may be needed.
   Est. part cost: $0
2. Failed Left Rear EPB Actuator Motor 🟡 Medium Probability The actuator motors are mounted directly on the rear brake calipers, where they are exposed to water, salt, and road debris. Water ingress is a very common cause of failure, leading to internal corrosion and seizure of the motor or gearbox.
   How to confirm: If recalibration fails, use a bidirectional scan tool to command the left EPB actuator. A lack of response, grinding noise, or the actuator failing to hold torque indicates failure. Visual inspection may reveal a cracked housing or corrosion at the electrical connector.
   Typical fix: Replace the left rear EPB actuator motor. For models up to ~2016, this is often the 3-pin motor (LR036573) which can be replaced separately. On later models (~2017+), a 2-pin motor (LR102237) is used, and it is often more reliable to replace the entire caliper assembly (LR036568) which includes the motor.
   Est. part cost: $90-$300
3. Worn or Seized Parking Brake Shoes/Mechanism ⚪ Low Probability The Range Rover uses a 'drum-in-hat' system for the parking brake, with shoes inside the rear rotor. Debris buildup or lack of use can cause the shoe levers and cables to seize. This puts excessive strain on the EPB actuator motor, causing it to over-travel, fail, and log a 'stuck' code.
   How to confirm: This requires removing the rear brake caliper and rotor to inspect the internal parking brake shoes, springs, and actuator levers for wear, corrosion, or seizure.
   Typical fix: Replace the rear parking brake shoes and hardware kit. It is critical to clean and lubricate the pivot points. This should be done whenever replacing a failed EPB actuator to prevent a repeat failure from the same underlying cause.
   Est. part cost: $50-$100

Rare But Worth Checking

• Wiring Harness Damage: The wiring to the EPB actuator at the rear wheel is exposed and can become damaged from road debris or corroded at the connector pins, leading to a loss of signal or power.
• Failing Battery or Charging System Issue: → Shop Vehicle Battery A weak battery can cause low voltage conditions during startup, leading to improper module shutdowns and communication errors across various systems, including the ABS and EPB modules. This can sometimes trigger spurious fault codes.

Diagnosis Steps

1. Connect a Land Rover-compatible scan tool (like Autophix, iCarsoft, or GAP IIDTool) to the OBD-II port.
2. Read fault codes from the Anti-lock Brake System (ABS) module.
3. Confirm the presence of C2006-71 and check if the related codes C2005, C2007, and C2008 are also logged.
4. If the full set of codes is present, perform the 'no-tool' EPB recalibration procedure as outlined in TSB SSM74004: Lock vehicle, wait 10 mins, unlock, start engine, press foot brake, press EPB switch down for 2s, then pull up to apply.
5. If the code returns or appears alone, use the scan tool to put the EPB system into 'Service Mode' or 'Pad Replacement Mode'. This is required before any mechanical work.
6. Raise and safely support the vehicle. Remove the left rear wheel.
7. Visually inspect the EPB actuator motor and its electrical connector for signs of damage, corrosion, or cracks. Check if you have the 3-pin or 2-pin connector to order the correct part.
8. If the actuator is suspect, replace it. On many L405 models, this requires replacing the entire brake caliper.
🎬 See this walkthrough for replacing the rear brake caliper assembly
9. It is highly recommended to also remove the brake rotor and inspect the internal 'drum-in-hat' parking brake shoes and hardware for wear or seizure at this time. Replace if necessary to prevent repeat actuator failure.
10. After reassembly, use the scan tool to exit 'Service Mode' and perform the new part calibration or 'bedding-in' procedure.
11. Clear all fault codes and test the EPB operation multiple times to confirm the repair.

Parts You'll Likely Need

• Electronic Parking Brake Actuator Motor (Left) (OEM #LR036573 (3-pin, up to ~2016), LR102237 (2-pin, ~2017+)) — This is the most common hardware component to fail due to water ingress or internal wear, causing the 'actuator stuck' code. Verify pin count before ordering. 🎬 Watch: How to identify and replace the correct EPB motor
  Trusted brands: Land Rover (Genuine), TRW (OEM), Britpart, Allmakes 4x4
  OEM price range: $250-$300
  Aftermarket price range: $90-$150
• Left Rear Brake Caliper with EPB Motor (OEM #LR036568) — On many 2017-2018 models, the actuator motor is integrated with the caliper. Replacing the entire assembly is often the most reliable and sometimes necessary repair for a failed motor.
  Trusted brands: Land Rover (Genuine), TRW
  OEM price range: $400-$550
  Aftermarket price range: $250-$400
• Parking Brake Shoe Kit (OEM #LR031947) — Worn or contaminated parking brake shoes are a common underlying cause of actuator failure and should be replaced to ensure a lasting repair.
  Trusted brands: Ferodo, TRW, Brembo
  OEM price range: $80-$120
  Aftermarket price range: $50-$80

Related Codes That Often Appear With This One

• C2005-71 — Right actuator – Actuator Stuck. This is the corresponding code for the right side and often appears with C2006 as part of the system-wide software fault described in TSB SSM74004.
• C2007-72 — Right Motor – Actuator Stuck open. Another related code for the right side that is logged during the same fault event.
• C2008-72 — Left Motor – Actuator Stuck open. This is a more specific fault for the left motor and is directly related to C2006.
• U3001-77 — Control Module Improper Shutdown. This code is mentioned in TSB SSM73905 as potentially appearing with the cluster of EPB codes, indicating the fault is preventing the ABS module from shutting down correctly.

Technical Service Bulletins (TSBs) & Recalls

• SSM74004: Details the software glitch causing a 'Park Brake needs Calibration' message and the C2005/C2006/C2007/C2008 code cluster, providing a no-tool recalibration procedure.
• SSM73905: Lists C2006-71 with a group of related EPB codes logged in the ABS module.

Platform-Specific Known Issues

• A known software issue documented in TSB SSM74004 can cause C2006 and related codes to be logged without any hardware fault, often fixable with a simple recalibration.
• TSB SSM73905 specifically mentions C2006-71 appearing with C2005-71, C2007-72, C2008-72, and U3001-77 as a cluster of codes pointing to a parking brake actuator fault.
• Water ingress into the actuator motor housing is a frequent cause of failure due to its exposed location on the caliper.

Mechanic-Grade Diagnostic Values

• EPB Actuator Motor Resistance — expected: 0.6 Ohms or less. Failure: A resistance reading greater than 0.6 Ohms when testing directly at the actuator motor's pins indicates a faulty motor.
• EPB Actuator Circuit Resistance — expected: Less than 3.0 Ohms. Failure: A high reading (over 5 ohms) when measuring the wiring harness resistance between the control module and the actuator indicates a fault in the wiring, such as corrosion or a break.

Hidden / Shadow Codes Worth Checking

• C2006-71: Left actuator – Actuator Stuck. This is a manufacturer-specific suffix code that provides detail beyond the base C2006 code. (see via A Land Rover-compatible scan tool (JLR SDD, Pathfinder, GAP IIDTool, advanced Autel/iCarsoft models) that can read detailed faults from the ABS module.)
• C2008-72: Left Motor – Actuator Stuck open. This related code often appears with C2006 and indicates the motor itself is detected as being stuck in the open/released position. (see via A Land Rover-compatible scan tool that can read detailed faults from the ABS module.)

Scan Tool Commands That Help

• GAP IIDTool: Service Menu -> ABS Module -> 'Go to service position' — This command must be used before any physical work on the rear brakes, such as replacing pads, rotors, or the actuator itself. It retracts the EPB motor to allow disassembly. After work is complete, 'Exit maintenance mode' must be selected.
• JLR Pathfinder / SDD / compatible advanced scanner: Parking brake pad replacement - release to service position / Mounting Position — This is the OEM command to retract the EPB motors for service. It is a mandatory first step before any mechanical repair of the rear brakes.
• JLR Pathfinder / SDD / compatible advanced scanner: Calibrate EPB / Park Brake Bedding Cycle Active — This function must be run after replacing the actuator or parking brake shoes to allow the module to learn the new component's parameters and ensure correct operation. Skipping this can lead to repeat failure.

Wiring & Ground Locations

• Main Chassis/Engine Earth Leads — One primary ground point is located in the engine bay, under the air filter housing. A second critical ground strap connects the gearbox to the chassis.. The L405 platform is known for corrosion at these main ground points, which can cause a cascade of seemingly unrelated electronic faults and communication errors across the vehicle, including spurious EPB faults. Cleaning these grounds can resolve intermittent issues that defy normal diagnosis.
• Left Rear Actuator Connector — The 2-pin or 3-pin electrical connector plugs directly into the EPB actuator motor mounted on the back of the left rear brake caliper.. This connector and its associated wiring are exposed to road spray and debris, making them a common point for corrosion or physical damage that can interrupt the signal to the motor and trigger code C2006.

Real Owner Repair Stories

• Reddit user on r/RangeRover (2017 Range Rover L405) — Multiple faults appeared on the dashboard suddenly.
  ❌ Tried (didn't work) N/A, user was seeking advice before going to a shop.
  ✅ What actually fixed it A responding user identified the common cause as a corroded main chassis earth point where multiple modules ground. The recommended fix was to locate the ground hub, disconnect the wires, clean the contact point on the chassis and the wire terminals until shiny, and re-secure everything.
• YouTube video by 'RANGE ROVER L405 5.0 Supercharged Earth Leads Fixed!' (Range Rover L405 5.0 Supercharged) — All warning lights on the dashboard, flickering display, restricted performance, and jerky gearbox behavior.
  ❌ Tried (didn't work) Initially suspected a battery issue.
  ✅ What actually fixed it The problem was traced to two badly corroded main earth leads. One was located under the airbox in the engine bay, and the other was a strap for the gearbox. The fix involved removing the leads, cleaning all contact points to bare metal, and replacing a lead that had snapped from corrosion. This resolved all the electronic faults.

OEM Part Supersession History

• LR036573 → LR102237 — Change in actuator design from a 3-pin electrical connector to a 2-pin connector.
  Heads up: The 3-pin (LR036573) and 2-pin (LR102237) actuators are not interchangeable due to the different wiring connectors. It is critical to visually inspect the existing part or check by VIN before ordering a replacement for a 2017 model, as it was a changeover year.

Model Year Variations Within This Range

• 2017: The 2017 model year is a changeover period for the EPB actuator motor. Earlier 2017 models may use the 3-pin motor (LR036573), while later models (from VIN HA000001) use the 2-pin motor (LR102237). The 2018 model year, being part of the L405 facelift, will exclusively use the later 2-pin motor.