All Terrain Progress Control (ATPC)

What is All Terrain Progress Control?

All Terrain Progress Control (ATPC) is an advanced JLR driver assistance system that functions as a low-speed cruise control, designed specifically for off-road and low-traction environments. Unlike standard cruise control that operates at highway speeds, ATPC allows the driver to set a target speed between 1 km/h (0.6 mph) and 32 km/h (20 mph) for off-road use, and up to 65 km/h (40 mph) for on-road use. The vehicle automatically manages throttle and braking to maintain the set speed, enabling the driver to focus entirely on steering and obstacle negotiation.

ATPC integrates directly with the vehicle’s Terrain Response 2 system, Electronic Stability Control (ESC), and Adaptive Cruise Control (ACC) modules. The system uses wheel speed sensors, yaw rate sensors, and engine torque management to maintain precise speed control across gravel, sand, mud, rock, and snow surfaces. This retrofit kit adds full OEM ATPC functionality to compatible JLR vehicles that were not factory-equipped with this option.

Technical Specifications

ATPC Module Location

In factory-equipped vehicles, the ATPC control logic is integrated within the Central Junction Box (CJB) and the Terrain Response 2 control module. The physical ATPC steering wheel switch is mounted on the left-hand side of the steering wheel, replacing the standard cruise control switch. On vehicles without factory ATPC, the switch blank is present behind the steering wheel trim.

Our retrofit kit includes a pre-programmed CANbus bridge module that installs in the driver’s footwell, behind the OBD-II port cover. This module intercepts the HS-CAN bus and inserts the ATPC control messages. The module location is standardised for LR4, Range Rover L405, Range Rover Sport L494, Discovery 4, and Discovery 5 vehicles. Detailed location diagrams are provided in the installation guide.

Vehicle Compatibility

ATPC retrofit is supported on the following JLR platforms equipped with Terrain Response 2 and electronic park brake (EPB):

• Land Rover LR4 / Discovery 4 (2010–2016) – all engines
• Range Rover L405 (2013–2022) – all variants including LWB and SVAutobiography
• Range Rover Sport L494 (2013–2022) – HSE, HST, SVR (non-ATPC factory vehicles)
• Land Rover Discovery 5 (2017–2023) – all grades
• Range Rover Velar L560 (2017–2023) – R‑Dynamic trim only
• Land Rover Defender L663 (2019–2023) – requires steering wheel swap for ATPC switch

VIN Check Required: Use our free compatibility checker to confirm your vehicle has the necessary TR2 and ABS modules. Vehicles with factory-fitted “Active Cruise Control with Stop & Go” (option code 059AB) are pre-wired for ATPC.

Why Retrofit ATPC?

Installation Overview

Typical installation time is 45–75 minutes for experienced DIY users. Basic mechanical and electrical knowledge is recommended. Required tools: T20 Torx driver, plastic trim removal tool, 10mm socket (for battery terminal), and a Windows laptop (or Mac with Parallels) for OBD flashing.

1. Disconnect battery: Disconnect the negative terminal and wait 5 minutes for system capacitors to discharge.
2. Replace steering wheel switch: Remove the left-side steering wheel trim (airbag unit not required). Unclip the existing cruise control switch and install the ATPC switch. Connect the ribbon cable to the clock spring.
3. Install CANbus bridge module: Locate the OBD-II port under the driver’s side dashboard. Remove the lower panel (2x T20 screws). Plug the Y‑harness between the vehicle’s OBD port and our bridge module. Secure the module with the included zip tie to the wiring loom.
4. Flash ATPC calibration: Connect the OBD programmer to the diagnostic port. Launch the LR-Retrofit software on your laptop. Enter your VIN – the software will read the current CCF, apply ATPC enable bits, and write the modified CCF. This process takes approximately 8 minutes.
5. Test and reassemble: Reconnect the battery. Start the engine. Press the ATPC button on the steering wheel – the ATPC icon should appear on the instrument cluster and infotainment screen. Set speed using the SET/+/- buttons. Test off-road mode by selecting low-range (if equipped) or by activating Terrain Response 2 in Sand or Mud/Ruts mode.

A complete installation guide with wiring diagrams and video walk-through is provided with the kit.