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2018 Charger R/T Harsh 1-2 Shift and Delayed Engagement

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Amanda S. · rep 0 · May 22, 5:41 AM · 1 replies · solved · Question

Vehicle: 2018 Dodge Charger R/T

My 2018 Dodge Charger R/T, with about 70k miles, has been acting up lately. I've noticed a really harsh and jerky shift from 1st to 2nd gear, especially when the engine is cold. It smooths out a bit once warmed up, but it's still noticeable.

Sometimes, when I put it into drive from park, there's a noticeable delay before it engages, almost like a clunk. It's making me a bit worried about the transmission.

I haven't seen any warning lights on the dash yet, but the feeling is definitely off. Has anyone else experienced this with their Charger? What could be causing this?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:41 AM

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ClearTheCode admin answer:

Harsh shifting and delayed engagement in your 2018 Dodge Charger R/T can be concerning, but there are several common causes and diagnostic steps to consider.

Potential Causes:

  • Low or Degraded Transmission Fluid: The most common culprit. Low fluid levels can cause pressure issues, leading to harsh shifts. Old, burnt, or contaminated fluid loses its lubricating and hydraulic properties.
  • Faulty Transmission Solenoid Pack: Solenoids control the flow of transmission fluid to engage gears. A failing solenoid can cause incorrect gear engagement or delayed shifts.
  • Worn Valve Body: The valve body directs transmission fluid to the appropriate clutch packs. Wear or blockages can disrupt this process.
  • Transmission Control Module (TCM) Issues: Software glitches or internal failures within the TCM can lead to incorrect shift commands.
  • Internal Transmission Wear: In some cases, worn clutch packs or other internal components can be the cause, especially at higher mileage.

Diagnostic Steps:

  1. Check Transmission Fluid Level and Condition: This is the first and easiest step. Ensure the fluid is at the correct level (usually checked when warm and in park). Note its color and smell. Burnt smell or dark color indicates degradation.
  2. Scan for Diagnostic Trouble Codes (DTCs): Even without a check engine light, a pending or stored transmission code (e.g., P0700 - Transmission Control System Malfunction, or specific gear ratio codes like P0731) could be present in the TCM. A professional scan tool can access these.
  3. Consider a Transmission Fluid and Filter Change: If the fluid is old or dirty, a flush and filter replacement with the manufacturer-recommended fluid might resolve minor shifting issues.

When to See a Shop:

  • Immediately if you notice any new warning lights (e.g., Check Engine Light, Transmission Temperature Warning).
  • If the harsh shifting or delayed engagement worsens significantly.
  • If scanning for codes reveals serious transmission-related DTCs that point to internal failures.
  • If a fluid change doesn't resolve the issue, as it could indicate a more serious internal component failure (e.g., solenoid pack, valve body, or even clutch packs).

A qualified transmission specialist can perform advanced diagnostics, including pressure tests and live data monitoring, to pinpoint the exact cause. Ignoring these symptoms can lead to more extensive and costly repairs down the line.

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