Land Rover Range Rover Sport: Terrain Response Relay & Mode Selector Fault

The L320 Sport Terrain Response system uses the same rotary mode selector and relay pack architecture as the L322, coordinating throttle, transmission, diff lock, and stability systems across terrain programmes. The resistive track in the rotary selector wears and contaminates over time, producing mode misread events. The relay pack in the rear cargo area is exposed to moisture from wet luggage and boot flooding events, causing relay contact corrosion. Fault presentation on the L320 Sport is typically more frequent than the L322 due to higher rates of off-road usage by Sport owners who keep the vehicle near the ground and expose the system to mud contamination of the selector dial.

• Terrain Response warning light on cluster
• Programme selector appears engaged but system does not respond
• Multiple 4WD and stability system warnings simultaneously
• TR selector dial physically turns but no mode change occurs
• System resets to General programme randomly while driving

1. 1

   Test all Terrain Response programmes sequentially from a cold start.

2. 2

   Pull stored and pending fault codes from the TR module specifically.

3. 3

   Inspect the selector dial surround for contamination, mud, or sticky detailing product residue affecting the resistive track.

4. 4

   Check rear electrical compartment for any evidence of water ingress.

Parts involved: Body corrosion, Differential.

$480 to $2,400 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Does the Terrain Response system engage all programmes without fault lights?”
• “Has the TR selector, relay pack, or module been replaced or reprogrammed?”
• “Are there any recurring or intermittent warning lights on the dashboard?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.