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2020 XT5 Transmission Shifting Hard - P0700 & P0717

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Eric V. · rep 0 · May 22, 3:56 AM · 1 replies · solved · Question

Vehicle: 2020 Cadillac XT5 Premium Luxury 2.0T AWD

Hi all,

I'm having some concerning issues with my 2020 Cadillac XT5, 2.0T AWD. Recently, the transmission has started shifting very harshly, especially between 2nd and 3rd gear, and sometimes when downshifting. It's not smooth at all, and I can really feel the clunk.

The check engine light came on, and when I scanned it, I got P0700 (Transmission Control System Malfunction) and P0717 (Input/Turbine Speed Sensor Circuit No Signal).

Could this be a simple sensor issue, or am I looking at something more serious with the transmission itself? Any thoughts on what I should check first?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:56 AM

0

ClearTheCode admin answer:

The P0700 and P0717 codes on your 2020 Cadillac XT5 indicate a problem with the transmission control system, specifically related to the input/turbine speed sensor. This sensor is crucial for the Transmission Control Module (TCM) to accurately determine transmission input shaft speed, which is vital for smooth shifting.

  1. Understand the Codes:

    • P0700: This is a generic code indicating that the TCM has detected a fault and has illuminated the Check Engine Light. It usually means there's a more specific transmission-related code stored in the TCM's memory.
    • P0717: This code directly points to an issue with the input/turbine speed sensor circuit, meaning the TCM is not receiving a signal from this sensor.

  2. Initial Diagnostic Steps:

    • Check Transmission Fluid Level and Condition: While less likely to cause a specific sensor code, low or dirty transmission fluid can contribute to shifting issues. Ensure the fluid is at the correct level and looks clean.
    • Inspect Wiring and Connectors: Visually inspect the wiring harness leading to the transmission and the input/turbine speed sensor for any signs of damage, fraying, or loose connections. Corrosion in the connector can also disrupt the signal.
    • Clear Codes and Test Drive: Sometimes, a transient electrical glitch can trigger codes. Clear the codes and take a short, gentle test drive to see if they return immediately.

  3. When to See a Shop:

    • Given the specific P0717 code, a faulty input/turbine speed sensor is a strong possibility. Replacing this sensor often resolves the issue. However, accessing and replacing it can be complex, sometimes requiring transmission removal or partial disassembly.
    • If the wiring appears fine and the codes persist, it's best to have a qualified transmission specialist diagnose it. They have advanced diagnostic tools to test the sensor's signal directly and rule out internal transmission issues or a faulty TCM.
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