2017 Q50 Red Sport Low Coolant Warning - Any common issues?

ClearTheCode admin answer:

It's concerning to get low coolant warnings, especially if you're not seeing obvious puddles. For your 2017 Infiniti Q50 Red Sport with the VR30DDTT engine, coolant loss can indeed be a known reliability concern. Here's what you should investigate:

1. Common Leak Points:

   • Turbocharger Coolant Lines: The VR30DDTT engine uses coolant to cool the turbochargers. The lines and seals associated with these turbos are a common failure point for leaks, especially as the vehicle ages. These leaks can be subtle and evaporate before hitting the ground, or drip onto hot engine components.
   • Coolant Hoses and Connections: Inspect all visible coolant hoses, clamps, and connections for any signs of weeping, crusty residue, or swelling. Pay close attention to the hoses near the radiator, engine block, and heater core.
   • Radiator End Tanks: Plastic end tanks on the radiator can crack over time, leading to slow leaks.
   • Water Pump: While less common on newer models, a failing water pump can develop a leak from its weep hole.

2. Internal Leaks:

   • Head Gasket: Although less frequent on these engines, a compromised head gasket can allow coolant to enter the combustion chambers or oil passages. Symptoms might include white smoke from the exhaust, milky oil, or coolant in the oil.
   • Cracked Cylinder Head/Block: A more severe issue, but usually accompanied by significant overheating or performance problems.

3. Diagnostic Steps:

   • Pressure Test: A professional shop can perform a cooling system pressure test. This involves pressurizing the system and observing if the pressure drops, indicating a leak, and often revealing the leak point.
   • UV Dye: Adding UV dye to the coolant can help pinpoint elusive leaks. After driving, a UV light can reveal glowing traces of coolant.
   • OBD Codes: While a low coolant warning itself might not trigger a specific P-code, persistent low coolant leading to overheating could eventually trigger codes like P0117 (Engine Coolant Temperature Sensor 1 Circuit Low) or P0118 (Engine Coolant Temperature Sensor 1 Circuit High) if the sensor reads out of range due to lack of coolant. However, for a slow leak, you might not get a code until it's severe.

4. When to See a Shop:

   • Immediately: If you notice the temperature gauge rising above normal, steam from under the hood, or a rapid drop in coolant level. Driving with insufficient coolant can lead to severe engine damage.
   • Soon: Given that you're consistently topping off the coolant, it's highly recommended to have a qualified Infiniti technician or a trusted independent shop diagnose the issue promptly. They have specialized tools and experience with the VR30DDTT engine to accurately locate the source of the leak and recommend the appropriate repair. Ignoring a coolant leak can lead to catastrophic engine failure.

Do not continue to drive long distances if the warning persists or if you suspect a significant leak.