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2018 Q60 3.0t - Harsh Shifting and Transmission Warning Light

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David L. · rep 0 · May 22, 5:02 AM · 1 replies · solved · Question

Vehicle: 2018 Infiniti Q60 3.0t Luxe

Hey everyone,

I'm experiencing some concerning issues with the transmission in my 2018 Infiniti Q60 3.0t Luxe. Lately, the shifts have become very harsh, especially between 2nd and 3rd gear, and sometimes when downshifting. It feels like a jolt.

Today, a 'Transmission Malfunction' warning light came on the dashboard. I don't have an advanced scanner that can read transmission-specific codes, only basic OBD-II. The car still drives, but I'm worried about causing more damage.

Is this a common problem with the 7-speed automatic in the Q60? What could be causing this, and what should I do before taking it to a dealer? Could it just be low fluid, or something more serious?

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

A 'Transmission Malfunction' warning light combined with harsh shifting in your 2018 Infiniti Q60 3.0t is a serious concern and warrants immediate attention. The 7-speed automatic transmission (RE7R01A) is generally robust, but issues can arise. Here's what to consider:

  1. Check Transmission Fluid Level and Condition:

    • Cause: Low or degraded transmission fluid is a common cause of shifting problems and can lead to overheating and damage. Infiniti transmissions are sensitive to fluid quality.
    • Action: While the Q60's transmission doesn't have an easily accessible dipstick for owners, a shop can check the fluid level and condition (color, smell) using specific procedures. If the fluid is low, dark, or smells burnt, it's a strong indicator of a problem.

  2. Scan for Transmission Codes (TCM Codes):

    • Cause: The 'Transmission Malfunction' light means the Transmission Control Module (TCM) has detected an issue and stored a diagnostic trouble code (DTC). These are often P07xx series codes.
    • Action: A standard OBD-II scanner might not read these specific transmission codes. You'll need an advanced scanner or a visit to a shop/dealership to retrieve these codes. The codes will pinpoint the specific area of concern (e.g., solenoid fault, sensor issue, clutch pack problem).

  3. Valve Body Issues:

    • Cause: The valve body is a complex component within the transmission that directs fluid pressure to engage clutches and bands for gear changes. Solenoid failures or internal wear within the valve body can cause harsh or delayed shifts.
    • Action: This is typically diagnosed by a professional after retrieving specific TCM codes. Replacement or repair of the valve body can be costly but is a known issue in some transmissions.

  4. Software/Firmware Glitch:

    • Cause: Sometimes, a transmission's shifting behavior can be affected by outdated or corrupted software in the TCM.
    • Action: A dealership can check for and apply any available software updates for the transmission control module. This is a less common cause for a 'malfunction' light but can sometimes resolve minor shifting quirks.

When to See a Shop: Given the 'Transmission Malfunction' light and harsh shifting, it is highly recommended to stop driving your Q60 as soon as safely possible and have it towed to an Infiniti dealership or a reputable transmission specialist. Continuing to drive with a transmission issue can lead to catastrophic and much more expensive damage. They can properly diagnose the specific codes and recommend the appropriate repair.

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