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2020 QX60 No Start Condition - P0335 Crankshaft Position Sensor

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Mike T. · rep 0 · May 25, 3:46 AM · 1 replies · solved · Question

Vehicle: 2020 Infiniti QX60 AWD

My 2020 Infiniti QX60 AWD is suddenly refusing to start. It was running fine yesterday, but this morning it just cranks and cranks without firing up. The battery seems good, and all the lights come on.

I managed to get my basic scanner on it, and the only code I found was P0335, which points to a Crankshaft Position Sensor 'A' Circuit Malfunction. Could this one sensor really prevent the car from starting entirely?

Has anyone else experienced this with their QX60? Is it a common failure point, and is it something I could replace myself, or should I just have it towed to the dealership?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:46 AM

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ClearTheCode admin answer:

Yes, a faulty Crankshaft Position Sensor (CKP sensor) can absolutely cause a no-start condition in your 2020 Infiniti QX60. The CKP sensor is critical because it tells the Engine Control Module (ECM) the exact position and rotational speed of the crankshaft. Without this vital information, the ECM cannot properly time the fuel injection and ignition spark, preventing the engine from starting.

Here's what you should know and do:

  1. Understanding P0335: This code specifically indicates a problem with the CKP sensor circuit. This could mean the sensor itself is bad, the wiring to the sensor is damaged, or there's an issue with its connector.
  2. Common Causes:
    • Faulty CKP Sensor: Over time, these sensors can fail due to heat, vibration, or internal electronic issues. They are a known failure point on many vehicles, including some Infiniti models.
    • Wiring Damage: Inspect the wiring harness leading to the CKP sensor for any signs of fraying, cuts, or corrosion. Animal damage is also a possibility.
    • Connector Issues: Ensure the electrical connector to the sensor is clean, secure, and free of corrosion.
  3. Diagnosis Steps:
    • Visual Inspection: Locate the CKP sensor (often near the crankshaft pulley or on the engine block/transmission bellhousing). Check its wiring and connector thoroughly.
    • Resistance Test (Advanced): If you have a multimeter and the sensor's specifications, you can test the sensor's resistance. However, an intermittent failure might not show up with a simple resistance test.
    • Live Data (Professional): A professional scanner can read live data from the CKP sensor. If it shows no RPM signal while cranking, the sensor is highly suspect.
  4. Replacement: Replacing the CKP sensor can range from relatively easy to challenging, depending on its location. On some QX60 models, it's accessible. If you're comfortable working under the hood and have basic tools, you might be able to do it. Ensure you disconnect the battery before working on electrical components.

When to See a Shop: If you're not comfortable locating and replacing the sensor, or if after replacement the car still doesn't start, it's best to have your QX60 towed to a qualified mechanic or Infiniti dealership. They can perform more advanced diagnostics to rule out other issues, such as a faulty ECM or more complex wiring problems, although the P0335 code strongly points to the CKP sensor.

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