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2018 Wrangler JL Transmission Shifting Rough - Is this normal or a TSB issue?

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Chris P. · rep 0 · May 22, 3:29 AM · 1 replies · solved · Question

Vehicle: 2018 Jeep Wrangler JL Sahara

Hey everyone, I recently bought a used 2018 Jeep Wrangler JL Sahara, 3.6L with the 8-speed automatic. I've noticed that sometimes the transmission shifts pretty roughly, especially between 2nd and 3rd gear, and occasionally it feels like it hesitates before downshifting. It's got about 60,000 miles on it.

Is this a common characteristic for these transmissions, or should I be concerned? I've heard some chatter about transmission issues or TSBs for earlier JLs. I'm worried about a major repair bill down the line.

Has anyone else experienced this? What was your fix, or did you take it to the dealer? Any advice on what to look for or mention to a mechanic would be great. No check engine light yet, thankfully.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:29 AM

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ClearTheCode admin answer:

It's understandable to be concerned about rough shifting in your 2018 Jeep Wrangler JL. While some characteristics can be normal, persistent rough shifts or hesitation often point to an underlying issue. Here's what you should consider:

  1. Check for Technical Service Bulletins (TSBs): There have been TSBs related to transmission shifting performance for early JL models. Specifically, TSB 21-001-19 REV. A (for 2018-2019 JL/JT) addressed various transmission shift quality issues with software updates. Your dealer can check if your vehicle's VIN is covered and if the latest software has been applied.
  2. Fluid Level and Condition: Although less common on newer sealed transmissions, an incorrect fluid level or degraded fluid can cause shifting problems. This should be checked by a qualified technician.
  3. Adaptive Learning: Automatic transmissions have adaptive learning capabilities. Sometimes, a transmission can 'learn' undesirable shift patterns. A dealer can perform a 'quick learn' procedure or reset the adaptive values, which might improve shifting.
  4. Diagnostic Scan: Even without a Check Engine Light, a professional scan tool can often reveal pending or stored transmission-related diagnostic trouble codes (DTCs) like P0700 (Transmission Control System Malfunction) or specific gear ratio errors (e.g., P0731, P0732) that haven't triggered the MIL yet.
  5. Valve Body or Solenoid Issues: In some cases, issues with the transmission valve body or individual solenoids can lead to erratic shifting. This is a more involved diagnosis.

When to See a Shop:

  • Immediately: If the shifting becomes significantly worse, you hear unusual noises, or a Check Engine Light illuminates (especially with a flashing light). Continuing to drive with a severe transmission issue can cause further damage.
  • Soon: If the problem is consistent and bothersome, even without a CEL. A dealer or a reputable independent transmission shop can perform the necessary diagnostics, check for TSBs, and advise on software updates or potential hardware issues. Since your vehicle is out of the basic 3-year/36,000-mile warranty, understanding the cause is crucial for managing potential repair costs.
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