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2017 XT5 Hard Shifting & Limp Mode - P0700 & P0717

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Mike T. · rep 0 · May 25, 2:49 AM · 1 replies · solved · Question

Vehicle: 2017 Cadillac XT5 3.6L AWD

Hi Cadillac owners,

My 2017 Cadillac XT5, 3.6L AWD, has been acting up lately. For the past week, it's been shifting really hard, especially between 2nd and 3rd gear. Today, while driving on the highway, it suddenly went into 'limp mode' – felt like it was stuck in a higher gear, and the Check Engine Light came on.

I pulled over and scanned it. I'm getting two codes: P0700 - 'Transmission Control System Malfunction' and P0717 - 'Input/Turbine Speed Sensor Circuit No Signal'.

This sounds like a transmission issue, but I'm hoping it's not a full transmission replacement. Could it be just a sensor? Has anyone else experienced these codes on their XT5? What was the resolution? Any advice on next steps would be greatly appreciated.

Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:49 AM

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ClearTheCode admin answer:

The P0700 and P0717 codes on your 2017 Cadillac XT5 indicate a problem within the transmission control system, specifically pointing to an issue with the Input/Turbine Speed Sensor. The P0700 is a generic code that tells you the Transmission Control Module (TCM) has detected a fault and has illuminated the CEL, while P0717 specifies the sensor problem.

Common Causes:

  1. Faulty Input/Turbine Speed Sensor: This is the most direct cause indicated by P0717. This sensor monitors the rotational speed of the transmission's input shaft, providing crucial data to the TCM for proper gear shifting. If it fails, the TCM loses this data, leading to erratic shifts and limp mode.
  2. Wiring Harness Issues: Damaged, corroded, or loose wiring and connectors leading to the input speed sensor can interrupt the signal.
  3. Contaminated Transmission Fluid: While less likely to directly cause a sensor circuit code, extremely dirty or low transmission fluid can contribute to sensor malfunction or other transmission issues that might indirectly affect sensor readings.
  4. TCM Malfunction: In rare cases, the Transmission Control Module itself could be faulty, incorrectly interpreting sensor signals or failing to process them. However, sensor or wiring issues are much more common.

Diagnostic Steps:

  1. Check Transmission Fluid Level and Condition: Ensure the fluid is at the correct level and doesn't appear burnt or excessively dirty. Low fluid can cause various shifting problems.
  2. Inspect Wiring and Connectors: Visually inspect the wiring harness leading to the input speed sensor for any signs of damage, fraying, or corrosion. Ensure connectors are securely seated.
  3. Test Sensor Resistance/Voltage: If accessible, a multimeter can be used to test the resistance of the sensor or its output voltage, though this often requires specific vehicle knowledge or a wiring diagram.
  4. Scan for Other Transmission Codes: A more advanced scan tool might reveal additional sub-codes or specific TCM diagnostic information that could help pinpoint the issue.

When to See a Shop:

  • Immediately, as driving in limp mode can potentially cause further transmission damage.
  • If you're uncomfortable with electrical diagnostics or accessing transmission components.
  • If a visual inspection of wiring and fluid level doesn't reveal an obvious problem.
  • Replacing transmission speed sensors can sometimes be done without removing the entire transmission, but it often requires specialized tools and knowledge, and sometimes involves draining and refilling transmission fluid. A qualified transmission specialist or Cadillac dealer will have the expertise and equipment to accurately diagnose and repair this issue.
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