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2017 Chrysler 300 Transmission Shifting Hard - P07xx Code?

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Mike T. · rep 0 · May 25, 4:20 AM · 1 replies · solved · Question

Vehicle: 2017 Chrysler 300S 3.6L V6

I'm having some transmission trouble with my 2017 Chrysler 300S (3.6L V6), which has around 80,000 miles. Lately, it's been shifting really hard, especially from 1st to 2nd gear, and sometimes it feels like it delays before engaging a gear. It's an 8-speed automatic.

The check engine light just came on, but I haven't had a chance to scan it yet. I'm expecting some kind of transmission code, maybe a P07xx series. I've kept up with regular maintenance, but I'm not sure if the transmission fluid has ever been changed. Could low or old fluid be causing this, or am I looking at something more serious like a valve body or solenoid issue?

Any insights from other 300 owners who've dealt with similar rough shifting would be very helpful. What should I be prepared for?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:20 AM

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ClearTheCode admin answer:

Hard shifting and delayed engagement on your 2017 Chrysler 300S's 8-speed automatic transmission, especially with a Check Engine Light, warrant immediate attention. While a P07xx code is likely, the specific code will guide the diagnosis. Here are common causes for these symptoms:

  1. Low or Contaminated Transmission Fluid: This is a primary suspect. Chrysler's 8-speed transmissions are sensitive to fluid levels and quality. Old, burnt, or low fluid can cause erratic shifting and damage. While often considered 'lifetime' fluid, many experts recommend inspection and potential replacement around 60,000-100,000 miles, especially under heavy use. A professional can check the fluid level and condition accurately.
  2. Transmission Solenoid Pack: The transmission's valve body contains solenoids that control fluid flow to engage different gears. If one or more solenoids are failing or sticking, it can lead to harsh shifts, delayed engagement, or even prevent a gear from engaging. This often triggers specific P07xx codes related to solenoid performance.
  3. Valve Body Issues: The valve body itself can develop wear or blockages, affecting fluid pressure and flow to the solenoids and clutch packs. This is a more complex repair than just replacing a solenoid.
  4. Transmission Control Module (TCM): Less common, but a faulty TCM can send incorrect signals to the transmission, leading to shifting problems. A scan tool can often diagnose TCM communication or internal errors.
  5. Internal Transmission Wear: At 80,000 miles, internal wear on clutch packs or other components is possible, especially if maintenance has been neglected or if there's been consistent hard driving.

When to See a Shop: Given the complexity of modern automatic transmissions, especially an 8-speed, it is highly recommended to take your 2017 Chrysler 300S to a reputable transmission specialist or a Chrysler dealership immediately. Driving with these symptoms can cause further, more severe damage. They will use advanced diagnostic tools to read specific transmission codes, check fluid pressure, and perform detailed tests to accurately pinpoint the problem and recommend the correct repair.

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