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2020 Discovery Sport Coolant Leak - P0128?

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Mike T. · rep 0 · May 25, 4:46 AM · 1 replies · solved · Question

Vehicle: 2020 Land Rover Discovery Sport SE

Hi all,

I've got a 2020 Land Rover Discovery Sport SE, and I've been getting a 'Low Coolant Level' warning on my dash intermittently for the past week. I topped it off once, but it seems to be dropping again. I also noticed a faint sweet smell after driving, especially when I park it in the garage.

I haven't seen any obvious puddles under the car, but I'm worried it might be a slow leak. I also had a Check Engine Light come on briefly yesterday, and I think it might have been a P0128 code (Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)). Could these be related?

Where are the common places to check for leaks on these Discovery Sports? Any advice on what to look for or how to diagnose this at home before I take it to the dealer?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:46 AM

0

ClearTheCode admin answer:

Experiencing a low coolant warning and a sweet smell on your 2020 Discovery Sport suggests a coolant leak, which is a common issue across many vehicles. The P0128 code is definitely related and indicates that the engine is taking too long to reach or maintain its optimal operating temperature, often due to low coolant or a faulty thermostat.

  1. Common Leak Points: Start your inspection by looking at these areas, typically with the engine cold:
    • Coolant Reservoir: Check for cracks, especially around the seams or hose connections.
    • Hoses: Inspect all coolant hoses (upper, lower radiator hoses, heater hoses) for swelling, cracks, or wetness at the clamps.
    • Water Pump: Look for residue or drips around the water pump housing, usually located at the front or side of the engine.
    • Radiator: Check the radiator fins and end tanks for any signs of leakage, particularly where the plastic end tanks meet the aluminum core.
    • Thermostat Housing: The thermostat housing itself can develop cracks or leaks at its seals.
    • Heater Core: If you notice a sweet smell inside the cabin, it could indicate a leaking heater core, though less common.
  2. P0128 Code: This code confirms that your engine isn't maintaining proper operating temperature. If you have a significant leak, the lack of coolant will prevent the engine from warming up efficiently, triggering this code. A failing thermostat could also cause this, but the low coolant level points more strongly to a leak.
  3. Inspection Tips: Use a flashlight to thoroughly inspect all components. Look for pink or orange crusty residue, which is often dried coolant. You might also see fresh drips or wet spots. A pressure test, performed by a shop, is the most effective way to pinpoint elusive leaks.
  4. Correct Coolant: Ensure you're topping off with the correct Land Rover-approved coolant (typically a specific OAT or HOAT type, often pink or orange). Mixing different types can cause damage.
  5. When to See a Shop: Given the P0128 code and persistent coolant loss, it's highly recommended to take your Discovery Sport to a qualified mechanic or Land Rover dealership soon. Driving with low coolant can lead to engine overheating and severe damage. A professional can quickly diagnose the exact leak source and replace the faulty component, whether it's a hose, water pump, or thermostat.
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