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2018 Enclave Transmission Hesitation and Hard Shifts

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Mike T. · rep 0 · May 25, 2:48 AM · 1 replies · solved · Question

Vehicle: 2018 Buick Enclave Premium

Hey everyone,

I'm having some frustrating issues with my 2018 Buick Enclave, a Premium trim with about 75,000 miles. Lately, it's been hesitating quite a bit when shifting, especially from first to second gear. Sometimes, it feels like it slams into gear, which is really concerning.

It's not constant, but it's happening more frequently now. I've noticed it most when accelerating from a stop or at lower speeds. I'm worried this could be a major transmission problem. Has anyone else experienced this with their Enclave from this generation? What was the fix?

I'm thinking about taking it to the dealer, but I'd like to have some idea of what might be going on beforehand. Any advice or shared experiences would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:48 AM

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ClearTheCode admin answer:

Transmission hesitation and hard shifts in your 2018 Buick Enclave can be indicative of several issues, some minor, some more serious. It's good you're looking into it early.

Common Causes:

  • Low or Contaminated Transmission Fluid: Over time, transmission fluid can break down or become low due to leaks, leading to poor lubrication and shifting performance.
  • Transmission Control Module (TCM) Issues: The TCM can develop software glitches or hardware failures, causing incorrect shift commands.
  • Solenoid Problems: Shifting solenoids within the transmission control the flow of fluid. If one is faulty, it can lead to erratic shifts.
  • Internal Transmission Wear: Components like clutch packs or valve bodies can wear out, especially at higher mileage, resulting in hard shifts.
  • Torque Converter Issues: A failing torque converter can cause shuddering or inconsistent power transfer, often felt during shifts.

When to See a Shop & What to Expect:

  1. Check Fluid Level and Condition: This is the first and easiest step. A qualified technician will check your transmission fluid level and inspect its color and smell. Burnt-smelling or dark fluid is a red flag.
  2. Scan for Diagnostic Trouble Codes (DTCs): Even if your check engine light isn't on, a specialized transmission scanner can often pull pending or stored codes. Common OBD codes related to transmission issues include P0700 (Transmission Control System Malfunction), P0717 (Input/Turbine Speed Sensor Circuit No Signal), P0722 (Output Speed Sensor Circuit No Signal), or various P07xx codes indicating specific solenoid or gear ratio errors.
  3. Software Updates/Reprogramming: Sometimes, a simple software update for the TCM can resolve shifting anomalies.
  4. Diagnostic Test Drive: A technician will drive the vehicle to replicate the issue and observe shift points and feel.
  5. Internal Inspection (if necessary): If simpler fixes don't work, more in-depth diagnostics, potentially involving dropping the transmission pan or removing the transmission, might be needed.

Given the nature of transmission problems, it's highly recommended to have a professional diagnose this as soon as possible to prevent further, more costly damage.

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