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2017 Canyon Transmission Slipping & Hard Shifts - P0700?

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Mike T. · rep 0 · May 22, 3:39 AM · 1 replies · solved · Question

Vehicle: 2017 GMC Canyon SLT

I'm having some serious transmission issues with my 2017 GMC Canyon SLT, 3.6L V6. It feels like the transmission is slipping, especially when accelerating from a stop or shifting into higher gears. Sometimes it also has really hard, jerky shifts.

I scanned it and got a P0700 code, which I know is a generic transmission control system malfunction. I'm worried this is going to be a major repair.

Has anyone else experienced this with their Canyon? What was the fix? Is there anything I can check myself before taking it to a transmission shop?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:39 AM

0

ClearTheCode admin answer:

The P0700 code on your 2017 GMC Canyon SLT indicates that the Transmission Control Module (TCM) has detected a fault within the transmission system and has illuminated the Check Engine Light. This code is a general informational code, meaning there are usually other, more specific transmission-related codes stored in the TCM that need to be retrieved.

Common Causes for Transmission Slipping and Hard Shifts with P0700:

  1. Low or Dirty Transmission Fluid: This is the most common and easiest thing to check. Low fluid levels can cause slipping and hard shifts. Dirty or burnt fluid indicates internal wear or overheating. Note: Many modern transmissions are sealed, and checking fluid requires specific procedures.
  2. Faulty Transmission Solenoids: Solenoids control the flow of transmission fluid to engage different gears. If a solenoid is stuck or failing, it can cause slipping, delayed shifts, or harsh shifts.
  3. Transmission Control Module (TCM) Issues: The TCM itself could be faulty, sending incorrect signals to the transmission.
  4. Internal Transmission Wear: Worn clutch packs, bands, or other internal components can lead to slipping.
  5. Valve Body Issues: The valve body directs fluid pressure to various parts of the transmission. A faulty valve body can cause a range of shifting problems.
  6. Sensor Malfunctions: Speed sensors (input/output) or temperature sensors can provide incorrect data to the TCM, leading to improper shift points.

What You Can Check (Limited):

  • Transmission Fluid Level and Condition: If your Canyon has a dipstick, check the fluid level according to your owner's manual (usually with the engine warm and running in Park). Note the color and smell. Burnt smell or dark color is a bad sign.
  • Look for Leaks: Check for any transmission fluid leaks under the vehicle.

When to See a Shop:

Given the P0700 code and the symptoms of slipping and hard shifts, it's crucial to take your Canyon to a qualified transmission specialist or a dealership as soon as possible. A standard OBD-II scanner will only show the P0700. A professional shop will have advanced diagnostic tools to:

  • Read the specific Pxxxx codes stored in the TCM.
  • Perform a road test and monitor live transmission data.
  • Conduct pressure tests to diagnose internal issues.

Driving with a slipping transmission can cause further damage, potentially leading to a more expensive repair or even a complete transmission replacement.

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