The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2018 Pacifica Transmission Hesitation and Rough Shifts - Is this normal?

0

Rachel A. · rep 0 · May 22, 5:57 AM · 1 replies · solved · Question

Vehicle: 2018 Chrysler Pacifica Touring L

Hey everyone,

I've got a 2018 Chrysler Pacifica Touring L with about 75,000 miles on it, and I've been noticing some really strange transmission behavior lately. From a stop, there's often a noticeable hesitation before it engages, almost like it's thinking too long. Once it gets going, the shifts can be pretty rough, especially the downshifts when coming to a stop.

It also feels like the transmission is 'hunting' for gears at times, particularly at lower speeds around town. It's not throwing any check engine lights, but it definitely doesn't feel right. I'm worried about the long-term reliability.

Has anyone else with a 2018 Pacifica experienced similar issues with the 9-speed automatic? Are there any known TSBs (Technical Service Bulletins) or recalls related to this? I'm trying to figure out if this is just a characteristic of this transmission or if I should be concerned and take it in for service.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:57 AM

0

ClearTheCode admin answer:

It's understandable to be concerned about transmission behavior, especially with the symptoms you're describing in your 2018 Chrysler Pacifica. The 9-speed ZF automatic transmission (9HP) used in these vehicles has been known to exhibit some unique shifting characteristics, and in some cases, actual issues.

  1. Common Causes for Hesitation and Rough Shifts:

    • Software Calibration: The most frequent cause for these symptoms in the 9HP transmission is often related to the transmission control module (TCM) software. Early versions of the software had known quirks that led to rough shifts, hesitation, and gear hunting. Chrysler has released multiple software updates to improve shifting logic and overall drivability.
    • Adaptive Learning: These transmissions have an adaptive learning process. If the battery has been disconnected, or if driving habits change significantly, the transmission might need to 're-learn' optimal shift points, which can temporarily result in rougher shifts.
    • Transmission Fluid Issues: Low or degraded transmission fluid can contribute to poor shifting. While often considered 'sealed for life,' regular fluid checks and changes (especially around 60,000-80,000 miles for heavy use) are beneficial.
    • Valve Body or Solenoid Issues: Less common, but internal components like the valve body or solenoids can malfunction, leading to inconsistent fluid pressure and shifting problems.

  2. Relevant TSBs and Recalls:

    • There have been several TSBs issued by Chrysler addressing transmission performance for the Pacifica. These often involve software updates to improve shift quality, address harsh engagements, or resolve specific diagnostic trouble codes (DTCs) that might not always trigger a check engine light immediately. A dealership can check your VIN for applicable TSBs and perform any necessary software flashes.

  3. OBD Codes to Watch For:

    • While you don't have a CEL, if the issue worsens, you might see codes like P0730 (Incorrect Gear Ratio), P0729 (Gear 6 Incorrect Ratio), P0731 (Gear 1 Incorrect Ratio), or P0732 (Gear 2 Incorrect Ratio). These indicate the transmission is not achieving the commanded gear ratio.

  4. When to See a Shop:

    • Given your mileage and the consistent nature of the problem, it's highly recommended to have your Pacifica inspected by a qualified technician, preferably at a Chrysler dealership. They have the specialized diagnostic tools to check for the latest software updates and can perform a thorough transmission diagnostic. Explain the symptoms clearly, and mention your concerns about potential TSBs. Early diagnosis can prevent more significant and costly repairs down the line.
Menu

Help & account