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2022 Canyon AT4 Transmission Shifting Hard and Delayed Engagement

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Mike T. · rep 0 · May 22, 3:41 AM · 1 replies · solved · Question

Vehicle: 2022 GMC Canyon AT4

Hi all,

I'm experiencing some concerning transmission issues with my 2022 GMC Canyon AT4, 3.6L V6. It has the 8-speed automatic transmission. Lately, I've noticed really hard shifts, especially between 1st and 2nd gear, and sometimes 2nd to 3rd. It's not smooth at all, almost a jolt.

Another problem is delayed engagement into drive or reverse after starting the truck. I'll put it in 'D' or 'R', and there's a noticeable pause, sometimes 2-3 seconds, before it actually engages. It feels like it's slipping a bit before it catches.

I haven't seen a Check Engine Light yet, but I'm worried this is a sign of a bigger problem. I've heard about transmission issues on some newer GMC trucks. Has anyone with a 2022 Canyon experienced similar symptoms? What could be causing this, and should I be looking for specific codes?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:41 AM

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ClearTheCode admin answer:

Hard shifts and delayed engagement in your 2022 GMC Canyon AT4's 8-speed automatic transmission are definitely symptoms that warrant immediate attention. Even without a Check Engine Light, the transmission control module (TCM) might have stored codes that indicate a problem.

Here's what could be happening and how to approach it:

  1. Check for Stored Transmission Codes: While the CEL might not be on, a professional-grade scan tool can often read 'pending' or 'history' codes from the Transmission Control Module (TCM). Look for codes in the P07xx range (e.g., P0700 - Transmission Control System Malfunction, or specific shift solenoid codes).
  2. Transmission Fluid Level and Condition:
    • Level: Check the transmission fluid level according to your owner's manual instructions (often requires specific temperature and engine running). Low fluid is a common cause of shifting issues and delayed engagement.
    • Condition: Inspect the fluid for color (should be reddish, not dark brown or black) and smell (should not smell burnt). Burnt fluid indicates excessive heat and potential internal damage.
  3. Software Updates/Reprogramming: Modern transmissions are heavily controlled by software. Sometimes, hard shifts or engagement issues can be resolved with a transmission control module (TCM) software update from the dealership. This is a common fix for 'harsh shift' complaints.
  4. Valve Body or Solenoid Issues: The valve body directs fluid pressure to engage clutches and bands. Solenoids within the valve body control these fluid passages. A faulty solenoid (stuck open or closed) or a worn valve body can cause hard shifts and delays.
  5. Clutch Pack Wear: While less likely on a relatively new 2022 model, excessive wear in clutch packs can lead to slipping and delayed engagement, especially if the vehicle has been subjected to heavy towing or aggressive driving.
  6. Torque Converter Issues: A failing torque converter can also cause delayed engagement and shuddering, though it often presents with other symptoms like RPM fluctuations.

When to See a Shop:

  • Immediately: Transmission problems can quickly escalate and lead to more severe and costly damage if ignored. Continuing to drive with these symptoms is not recommended.
  • Dealership or Transmission Specialist: Given the complexity of modern transmissions, especially an 8-speed, it's best to take your Canyon to a GMC dealership or a reputable transmission specialist. They have the specific diagnostic tools and expertise to accurately diagnose and repair these systems.
  • If Fluid is Low or Burnt: Do not just top off the fluid without investigating the cause of the low level or the burnt condition. This indicates an internal problem or a leak that needs professional attention.
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