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2018 Q50 3.0t Low Coolant Warning – Is this a common issue?

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Chris P. · rep 0 · May 22, 5:11 AM · 1 replies · solved · Question

Vehicle: 2018 Infiniti Q50 Red Sport 400

Hey everyone, I'm hoping for some advice here. I have a 2018 Infiniti Q50 Red Sport 400 with about 65,000 miles on it.

Lately, I've been getting a 'Low Engine Coolant' warning on my dash. I checked the reservoir, and it's definitely below the minimum line. I topped it off a few weeks ago, and now it's low again. I haven't noticed any obvious puddles under the car, but I'm worried about a potential leak or something more serious.

Is this a known issue with these VR30DDTT engines? What should I be looking for? I'm trying to figure out if this is a simple fix or something that's going to cost an arm and a leg. Any insights on common failure points or what parts might be involved would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:11 AM

0

ClearTheCode admin answer:

It's concerning to see a recurring low coolant warning, especially on a performance engine like the VR30DDTT in your 2018 Infiniti Q50 Red Sport 400. While not every VR30DDTT experiences this, coolant leaks are a known issue for some owners.

Here are the common causes and steps to diagnose:

  1. Common Leak Points:

    • Turbo Coolant Lines: The coolant lines running to and from the turbos are a frequent culprit. The O-rings or fittings can degrade over time, leading to slow leaks that might evaporate before hitting the ground.
    • Water Pump: The mechanical water pump can develop leaks, often visible as a drip from the front of the engine.
    • Radiator End Tanks: The plastic end tanks on the radiator can crack, especially with age and temperature fluctuations.
    • Coolant Reservoir/Cap: Inspect the reservoir itself for hairline cracks and ensure the cap is sealing properly. A faulty cap can allow coolant to escape as steam.
    • Hoses and Clamps: Check all coolant hoses for signs of swelling, cracking, or loose clamps.

  2. Diagnostic Steps:

    • Visual Inspection: With the engine cold, carefully inspect the areas around the turbos, water pump, radiator, and all hose connections for any dried coolant residue (often pink or orange crusty stains).
    • Pressure Test: The most effective way to find a slow leak is a cooling system pressure test. A shop can pressurize the system and then look for drops in pressure or visible leaks.
    • UV Dye: Some technicians use UV dye added to the coolant. After driving for a bit, a UV light can reveal the exact source of the leak.

  3. Relevant OBD Codes: While a direct 'coolant leak' code doesn't exist, if the low coolant level affects engine temperature regulation, you might see codes like:

    • P0117: Engine Coolant Temperature Sensor Low Circuit
    • P0118: Engine Coolant Temperature Sensor High Circuit
    • P0128: Coolant Thermostat (Coolant Temperature Below Regulating Temperature)

  4. When to See a Shop:

    • Immediately if the 'Low Engine Coolant' warning persists after topping off, or if your engine temperature gauge starts to rise above normal operating levels. Driving with insufficient coolant can lead to severe engine damage, including head gasket failure or a seized engine.
    • If you cannot visually locate the leak or if the problem recurs after a temporary fix, professional diagnosis is essential. They can perform a pressure test and pinpoint the exact issue.

It's also a good idea to check for any relevant Technical Service Bulletins (TSBs) from Infiniti for your specific model year, as they sometimes address known manufacturing or design issues related to the cooling system.

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