The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2021 CT5 10-Speed Transmission Rough Shifts at Low Speed

0

Mike T. · rep 0 · May 25, 2:55 AM · 1 replies · solved · Question

Vehicle: 2021 Cadillac CT5 Premium Luxury 2.0L Turbo

I recently purchased a used 2021 Cadillac CT5 Premium Luxury with the 2.0L turbo engine, and I'm noticing some rough and hesitant shifts, especially at lower speeds (1st to 2nd, 2nd to 3rd gears). It feels a bit clunky and not as smooth as I'd expect from a luxury car with a 10-speed automatic.

Is this a common characteristic of the 10-speed transmission in the CT5, or could it be an issue? I've heard about adaptive transmissions, but this feels more like a problem. Are there any known TSBs or software updates for this transmission that I should look into? I want to make sure I address this before my warranty expires.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:55 AM

0

ClearTheCode admin answer:

The 10-speed automatic transmission (10LXX) in your 2021 Cadillac CT5 is a sophisticated unit, but some owners have reported experiencing rough or hesitant shifts, particularly at lower speeds or during specific gear changes. This can be attributed to several factors.

  1. Adaptive Learning: Modern transmissions, including yours, have adaptive learning capabilities. They learn your driving style over time. If the previous owner had a very different driving style, the transmission's learned parameters might not perfectly match yours. It can take some time (hundreds of miles) for it to fully adapt.
  2. Software Updates/Calibration: General Motors has released numerous software updates and recalibrations for their 10-speed transmissions across various models. These updates aim to refine shift logic, improve smoothness, and address specific shift quality concerns. This is often the first and most effective solution.
  3. Transmission Fluid Level/Quality: An incorrect transmission fluid level or degraded fluid quality can lead to shifting issues. While less likely on a relatively new 2021 model, it's worth checking.
  4. TSBs: There have been TSBs related to 10-speed transmission shift quality across GM's lineup. These TSBs often recommend specific diagnostic procedures or software updates to address concerns like harsh shifts, delays, or shuddering.
  5. When to See a Shop:
    • Soon: If the rough shifts persist beyond a few hundred miles of your driving, or if they are consistently harsh and disruptive, you should schedule an appointment with a Cadillac dealership. Since your vehicle is a 2021 model, it is likely still under the factory powertrain warranty.
    • Diagnostic Scan: A dealer can perform a diagnostic scan to check for any stored transmission-related trouble codes (e.g., P07XX series codes for transmission control or shift solenoids) and verify if there are any pending software updates or applicable TSBs for your specific VIN. Addressing this under warranty is crucial.
Menu

Help & account