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2018 Charger R/T Transmission Shudder - Is this normal?

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James R. · rep 0 · May 22, 5:49 AM · 1 replies · solved · Question

Vehicle: 2018 Dodge Charger R/T

Hey everyone,

I've got a 2018 Dodge Charger R/T with about 65,000 miles on it, and lately, I've been noticing a weird shudder or slight hesitation, especially when shifting at lower speeds, typically between 2nd and 3rd gear, or sometimes when downshifting. It's not a violent jerk, but definitely noticeable and feels like the transmission isn't quite smooth.

I bought the car used a year ago, and it's been great otherwise. I'm wondering if this is a common characteristic of the 8-speed automatic in these Chargers, or if it's something I should be concerned about. I haven't seen any check engine lights, but it's making me a bit nervous about the long-term reliability.

Has anyone else experienced this with their 2016-2020 Charger R/T or similar models? Is there a known fix or a TSB for this kind of issue? Any advice on what I should check or if it warrants a trip to the dealer would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:49 AM

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ClearTheCode admin answer:

It sounds like you're experiencing a common concern with the ZF 8HP automatic transmission found in many Dodge models, including your 2018 Charger R/T. While often robust, these transmissions can sometimes exhibit symptoms like shudders, harsh shifts, or delayed engagements, especially as mileage increases.

Here's what you should know and what steps you can take:

  1. Potential Causes:

    • Transmission Fluid Degradation: Over time and mileage, transmission fluid can break down, losing its lubricating and cooling properties. This can lead to increased friction and less smooth shifts. While some manufacturers claim 'lifetime' fluid, many experts recommend fluid and filter changes around 60,000-80,000 miles for optimal performance, especially under heavy use.
    • Software Glitches: The transmission's operation is heavily controlled by its Transmission Control Module (TCM) software. Sometimes, minor programming issues or calibration needs can cause these symptoms. Manufacturers often release software updates to address these.
    • Valve Body Issues: The valve body is a complex hydraulic control unit within the transmission. Wear or sticking valves can lead to inconsistent fluid pressure, resulting in harsh or delayed shifts.

  2. Relevant TSBs & Recalls:

    • There have been various Technical Service Bulletins (TSBs) issued by Dodge/FCA for the 8HP transmission related to shift quality concerns, including harsh shifts, delayed engagement, or shudders. These TSBs often recommend software updates or specific diagnostic procedures. For your 2018 Charger, a dealer can check for any applicable TSBs that might address your specific symptoms by VIN.
    • While not typically a safety recall for shudders, TSBs are important for addressing known operational issues.

  3. When to See a Shop:

    • Since you're experiencing noticeable symptoms, it's advisable to have a qualified technician, preferably at a Dodge dealership or a reputable transmission specialist, inspect the vehicle. They can perform a diagnostic scan to check for any stored manufacturer-specific fault codes (even if no Check Engine Light is on, as transmission modules store their own codes, e.g., P07xx series if severe enough).
    • Request that they check for any available software updates for the Transmission Control Module (TCM) and inspect the transmission fluid condition. A fluid and filter change might be recommended if the fluid is dark or smells burnt.

Addressing this proactively can help prevent more significant transmission problems down the road.

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