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2020 QX60 in Limp Mode - Transmission Warning Light On

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Kevin B. · rep 0 · May 22, 5:02 AM · 1 replies · solved · Question

Vehicle: 2020 Infiniti QX60 Pure

My 2020 Infiniti QX60 Pure suddenly went into what feels like 'limp mode' yesterday. I was driving on the highway, and all of a sudden, the car lost power, wouldn't shift gears properly, and the transmission warning light came on.

It feels like it's stuck in a single gear, and acceleration is extremely slow. I pulled over, turned it off, and restarted it, but the problem persists. I haven't scanned for codes yet, but I'm worried it's a major transmission issue. Has anyone experienced this with their QX60?

Any advice on what to check or what this might be would be greatly appreciated.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:02 AM

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ClearTheCode admin answer:

When your 2020 Infiniti QX60 enters limp mode with a transmission warning light, it's a clear indication that the vehicle's computer has detected a serious issue within the transmission system and is trying to protect it from further damage. This is a common protective measure.

Here are the most likely causes and recommended actions:

  1. CVT Fluid Issues: The QX60 uses a Continuously Variable Transmission (CVT). Low or degraded CVT fluid can cause overheating and operational problems. Check the fluid level and condition if possible, though many modern CVTs are sealed units.
  2. Transmission Sensor Failure: Sensors like the input speed sensor, output speed sensor, or transmission fluid temperature sensor can fail, sending incorrect data to the Transmission Control Module (TCM), leading to limp mode. Common OBD-II codes might include P07xx series (e.g., P0700, P0715, P0720) or P17xx series.
  3. Valve Body Issues: The valve body controls the hydraulic pressure and fluid flow within the transmission. Malfunctions here can prevent proper gear ratio changes.
  4. TCM Malfunction: The Transmission Control Module itself could be faulty, though this is less common than sensor or fluid issues.
  5. Internal CVT Component Wear: In some cases, internal wear or damage to the CVT belt or pulleys can trigger limp mode.

When to see a shop:

Given the severity of limp mode and the complexity of CVT transmissions, it is highly recommended to have your QX60 towed to a reputable Infiniti dealership or an independent transmission specialist as soon as possible. Driving in limp mode can exacerbate the problem and lead to more extensive and costly repairs. A professional will be able to retrieve specific diagnostic trouble codes (DTCs) and perform thorough diagnostics to accurately identify the root cause.

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