The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2017 Sierra 1500 8-Speed Transmission Shudder - Is there a fix?

0

Mark S. · rep 0 · May 25, 2:42 AM · 1 replies · solved · Question

Vehicle: 2017 GMC Sierra 1500 SLT

Hey everyone,

I've got a 2017 GMC Sierra 1500 SLT with the 5.3L V8 and the 8-speed automatic transmission. Lately, I've been experiencing a noticeable shudder, especially when accelerating at lower speeds or when shifting between gears 2-3 or 3-4. It feels like driving over rumble strips, but it's definitely coming from the drivetrain.

I've seen some discussions online about this being a common issue with these transmissions. It's really impacting the smooth ride I expect from a GMC truck. Has anyone found a permanent solution for this? Is it a known defect or something that can be easily fixed?

I'm worried about long-term reliability if this isn't addressed properly. Any advice or experiences with this issue would be greatly appreciated.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:42 AM

0

ClearTheCode admin answer:

The transmission shudder you're experiencing in your 2017 GMC Sierra 1500 is a well-documented issue, primarily affecting the 8L90 and 8L45 8-speed automatic transmissions. GMC (and GM overall) has acknowledged this problem, often referred to as 'torque converter shudder' or 'transmission shudder.'

Common Causes:

  1. Transmission Fluid Degradation: The original factory-fill transmission fluid (Dexron HP) was prone to breaking down and absorbing moisture, leading to premature wear and shuddering.
  2. Torque Converter Issues: In some cases, the torque converter itself can be faulty, contributing to the shudder.

Steps for Resolution:

  1. Special Fluid Flush (TSB): The primary and most effective fix involves a triple flush of the transmission fluid with a new, updated fluid (Mobil 1 Synthetic LV ATF HP or equivalent, meeting Dexron ULV specifications). This procedure is outlined in GM Technical Service Bulletin (TSB) #18-NA-355 (superseding earlier TSBs like 16-NA-175). This TSB specifically addresses the shudder condition.
  2. Software Update: Sometimes, a transmission control module (TCM) software reflash is performed in conjunction with the fluid flush to optimize shift points and pressure.
  3. Torque Converter Replacement: If the fluid flush and software update do not resolve the issue, or if the shudder is severe and persistent, a torque converter replacement may be necessary. This is a more extensive repair.

When to See a Shop:

  • You should schedule an appointment with a certified GMC dealership or an independent transmission specialist as soon as possible.
  • Mention the TSB #18-NA-355 when you talk to them. They will be familiar with this procedure.
  • While OBD-II codes like P0700 (Transmission Control System Malfunction) or P0741 (Torque Converter Clutch Circuit Performance or Stuck Off) can be present in severe cases, often the shudder occurs without triggering a diagnostic trouble code initially.
  • Continuing to drive with a severe shudder can lead to accelerated wear on the transmission components. Addressing it early can prevent more costly repairs down the line.
Menu

Help & account