The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2018 Grand Cherokee 8-Speed Transmission Hesitation/Lurching

0

Mike T. · rep 0 · May 25, 2:21 AM · 1 replies · solved · Question

Vehicle: 2018 Jeep Grand Cherokee Limited

Hey everyone,

I've got a 2018 Jeep Grand Cherokee Limited with the 3.6L Pentastar engine, and I'm experiencing some weird transmission behavior. When I'm accelerating from a stop, especially in stop-and-go traffic, there's a noticeable hesitation before it lurches into gear. It feels like it's struggling to find the right gear, or maybe slipping a bit.

It's an 8-speed automatic, and this issue seems to be getting worse over the last few weeks. No warning lights on the dash, but it's definitely not driving smoothly. Has anyone else encountered this with their Grand Cherokee? What could be causing this?

Thanks for any insights!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:21 AM

0

ClearTheCode admin answer:

Transmission hesitation and lurching in your 2018 Jeep Grand Cherokee can stem from several issues, even without a check engine light. It's crucial to address this promptly to prevent further damage.

Possible Causes:

  • Low or Contaminated Transmission Fluid: The 8-speed ZF transmission is sensitive to fluid levels and quality. Low fluid can cause slipping and harsh shifts. Contaminated fluid can reduce lubrication and affect valve body operation.
  • Transmission Control Module (TCM) Issues: The TCM might be experiencing software glitches or internal failures, leading to incorrect shift commands.
  • Solenoid Problems: Solenoids within the valve body control fluid flow to engage gears. Faulty solenoids can cause delayed or harsh shifts.
  • Valve Body Malfunction: The valve body directs transmission fluid. Wear or blockages can impede proper gear engagement.
  • Torque Converter Issues: Less common, but a failing torque converter can also contribute to hesitation and shuddering.

Diagnostics & Steps:

  1. Check Transmission Fluid: This is often a sealed unit, so professional inspection is usually required. Ensure the correct Mopar ZF 8-speed fluid is used.
  2. Scan for Codes: Even without a dash light, a professional scan tool can often pull 'pending' or 'history' codes related to the transmission or engine that aren't severe enough to trigger the MIL.
  3. Software Update: Check if there are any available software updates for your vehicle's TCM. Sometimes, a reflash can resolve shifting anomalies.

When to See a Shop: Given the complexity of modern automatic transmissions, it's highly recommended to take your Jeep to a qualified mechanic or a Jeep dealership as soon as possible. They have specialized diagnostic tools to accurately pinpoint the problem. Continuing to drive with significant transmission issues can lead to more extensive and costly repairs, potentially requiring a transmission rebuild or replacement.

Menu

Help & account