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2020 ES 350 No-Start Issue - Cranks but Won't Catch

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Mike T. · rep 0 · May 22, 4:39 AM · 1 replies · solved · Question

Vehicle: 2020 Lexus ES 350

Hi Lexus community,

I'm having a major problem with my 2020 Lexus ES 350. This morning, it wouldn't start. It cranks strongly, the battery seems fine, but the engine just won't catch and turn over. It sounds like it's trying, but it never fires up.

There are no warning lights on the dash, except for the usual ones that come on when the ignition is in the 'on' position before starting. I tried cycling the ignition a few times, but no luck. I'm worried it might be something serious. Any ideas on what could cause a crank-no-start condition in a relatively new car like this?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:39 AM

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ClearTheCode admin answer:

A crank-no-start condition on your 2020 Lexus ES 350 can be perplexing, especially without any immediate warning lights. This typically points to an issue with one of the three critical elements for engine combustion: fuel, air, or spark. Since it cranks strongly, we can likely rule out a completely dead battery or starter motor.

Here's a breakdown of common causes and diagnostic steps:

  1. Fuel Delivery Issues:

    • Cause: The engine isn't getting enough fuel. This could be due to a faulty fuel pump, a clogged fuel filter, a bad fuel pressure regulator, or even an issue with the fuel pump relay or fuse.
    • Action: Listen for the fuel pump priming sound (a low hum from the rear of the car) when you turn the ignition to 'on' without starting. You can also check the fuel pressure at the fuel rail if you have the right tools.

  2. Ignition System Problems:

    • Cause: The spark plugs aren't firing. This could be due to faulty spark plugs, bad ignition coils, or an issue with the crankshaft position sensor or camshaft position sensor, which tell the ECU when to fire the plugs.
    • Action: While harder to check without tools, a professional can quickly test for spark at the plugs. A failing sensor might not always throw a code immediately but can prevent starting.

  3. Air/Compression Issues:

    • Cause: Less common for a sudden no-start on a newer vehicle, but issues like a severely clogged air filter (unlikely to cause a no-start unless completely blocked), or internal engine damage leading to low compression could prevent starting.
    • Action: Ensure the air intake isn't visibly obstructed. A compression test would be needed to rule out internal engine issues.

  4. Security System (Immobilizer):

    • Cause: The vehicle's anti-theft system might be preventing the engine from starting if it doesn't recognize the key or if there's a fault in the system.
    • Action: Try using a spare key if you have one. Look for any flashing security lights on the dash that might indicate an immobilizer issue.

When to See a Shop:

Given that your 2020 Lexus ES 350 is a newer vehicle and a no-start condition can be complex to diagnose without specialized tools, it's best to have it towed to a Lexus dealership or a trusted independent mechanic. They can perform a comprehensive diagnostic scan, check fuel pressure, test for spark, and evaluate sensor readings to accurately identify the root cause and get your car running again.

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