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2017 Pacifica Shifting Hard, Hesitation, and Check Engine Light On

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Mike T. · rep 0 · May 25, 4:26 AM · 1 replies · solved · Question

Vehicle: 2017 Chrysler Pacifica Touring

Hey everyone,

I'm having some serious issues with my 2017 Chrysler Pacifica Touring. Lately, the transmission has been shifting really hard, especially between 3rd and 5th gear. There's also a noticeable hesitation when accelerating from a stop or after slowing down.

The check engine light came on yesterday, and I'm worried this is a major problem. I've heard about issues with the 9-speed transmission in these vans. Has anyone else experienced this with their Pacifica? Is it a known defect or something I should be preparing for a costly repair on?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:26 AM

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ClearTheCode admin answer:

It sounds like you're experiencing a common issue with the 9-speed automatic transmission (ZF 9HP) found in many 2017 Chrysler Pacifica models. Hard shifting and hesitation, especially when accompanied by a Check Engine Light, often point to transmission-related problems.

Here's what you should know:

  1. Common Causes:

    • Software Glitch: Early versions of the 9-speed transmission software had known bugs that caused rough shifting. Often, a dealer can perform a software update or reflash the Transmission Control Module (TCM).
    • Solenoid Pack Issues: The transmission uses solenoids to control fluid flow and gear engagement. Faulty solenoids can lead to incorrect shifting. Common diagnostic trouble codes (DTCs) related to this include P0734 (Incorrect Gear Ratio 4th Gear) or P0735 (Incorrect Gear Ratio 5th Gear).
    • Valve Body Problems: Less common, but a defective valve body can also cause erratic shifting.
    • Low Transmission Fluid: While less common in sealed transmissions, a leak could lead to low fluid levels and shifting problems.

  2. When to See a Shop:

    • Immediately: Since the Check Engine Light is on and you're experiencing hard shifts, it's crucial to have your vehicle inspected by a qualified technician as soon as possible. Continuing to drive with a transmission issue can lead to more severe and costly damage.
    • Dealership vs. Independent: For transmission issues, especially with specific software updates, a Chrysler dealership often has the most up-to-date diagnostic tools and service bulletins. An independent shop specializing in transmissions can also be a good option.

Ask the technician to check for any pending or stored diagnostic trouble codes (DTCs) and inquire about any available transmission software updates for your specific VIN. This is a known area of concern for some Pacifica owners, and Chrysler has issued service bulletins in the past to address these types of symptoms.

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