DIY REPAIR GUIDE — CHEVROLET SILVERADO, GMC SIERRA, TAHOE, SUBURBAN, YUKON, ESCALADE 2015
GM 8-Speed Shudder Fluid Flush Fix
Many 2015–2019 GM trucks and SUVs with the 8L90 or 8L45 eight-speed automatic develop a shudder at steady speeds, often described as driving over rumble strips.
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By the Radman Auto Repair team, independent auto repair in Etobicoke since 1999 · Updated November 2026
Many 2015–2019 GM trucks and SUVs with the 8L90 or 8L45 eight-speed automatic develop a shudder at steady speeds, often described as driving over rumble strips. The original transmission fluid absorbs moisture and loses its friction properties, so the torque converter clutch judders. GM’s fix is a full fluid flush with an updated fluid.
Quick answer: If your GM 8-speed shudders at 40–80 km/h, check your VIN with a GM dealer first. GM’s bulletin calls for flushing the transmission and torque converter with an updated fluid, which takes several cycles and special equipment. You can check the codes and fluid condition yourself, but the flush is best done by a shop.
At a glance
- Vehicles: Chevrolet Silverado, GMC Sierra, Tahoe, Suburban, Yukon, Escalade 2015–2019 (8L90); Colorado and Canyon 2017–2019 (8L45); Camaro and Corvette 8-speed
- DIY difficulty: Moderate–advanced
- Time: about 3 hours
- Tools: scan tool with GM transmission functions, fluid exchange machine or drain pans, sockets, jack stands, infrared thermometer
- Parts: GM-approved updated ATF for the 8-speed (per bulletin), transmission filter or seals (if specified)
- Codes & warning lights: P0741 torque converter clutch, P0796, often none
- Recalls: check your VIN first; some of these problems are covered by recalls, campaigns or extended warranties
Symptoms
Rumble-strip shudder a vibration like driving over rumble strips.
At steady speed between about 40 and 80 km/h with light throttle.
Goes away with more gas pressing harder or lifting off makes it stop.
Harsh shifts a clunk or hard 1–2 or 2–3 shift.
No codes often no warning light at all.
Worse over time the shudder gets more frequent.
What Causes It
Original fluid the original fluid absorbs moisture and its friction properties break down.
Torque converter clutch the converter clutch judders when it applies with that fluid.
Software shift and converter software updates are part of some repairs.
Converter wear a converter damaged by long shuddering may need replacing.
Before You Start
- Park on level ground, set the parking brake and chock the wheels. Never work under a car held up only by a jack: use rated jack stands.
- Let the engine and exhaust cool before you touch them; coolant systems are under pressure when hot.
- Wear safety glasses and gloves, and disconnect the 12V battery before unplugging electrical parts or working near airbags.
- Check for open recalls on your VIN (Transport Canada or the manufacturer’s site) before you buy parts: a recall repair is free at the dealer.
- A partial drain and fill leaves most of the old fluid inside; the bulletin calls for a full flush.
- Use only the GM-approved updated fluid; the wrong fluid can make it worse.
Step-by-Step: GM 8-Speed Shudder
- Confirm the symptom. Note the speed and throttle where the shudder happens. It feels like rumble strips at steady speed.
- Scan the codes. Read transmission codes and check torque converter clutch slip in live data.
- Check your VIN. Ask a GM dealer about the 8-speed shudder bulletin and any extended coverage for your truck.
- Check the fluid. At the check temperature, check the level and look at the colour and smell of the fluid.
- Book the flush. Have the transmission and converter flushed with the updated fluid per the bulletin, usually with a fluid exchange machine.
- Update software. Install any transmission software updates for your VIN.
- Reset adaptives. Reset and relearn transmission adaptive pressures with the scan tool.
- Road test. Drive at the speeds where it shuddered to confirm it is gone.
When to Stop and Bring It In
- The shudder stays after the flush: the torque converter may need replacing.
- There are slipping, flaring or gear ratio codes.
- You don’t have a fluid exchange machine: the flush is best done at a shop.
- Your truck may be covered: let the dealer check first.
Not sure, or out of time? Radman Auto Repair in Etobicoke does this repair every week. Book online or call (416) 742-4521.
Also Known As
Owners describe this as “Silverado 8 speed shudder”, “Sierra rumble strip feeling”, “Tahoe transmission shudder at 45 mph”, “8L90 shudder” or “GM torque converter shudder”. GM calls the fix a transmission fluid exchange.
Frequently Asked Questions
Why does my Silverado shudder like rumble strips?
On 2015–2019 8-speed trucks, the original transmission fluid loses its friction properties, so the torque converter clutch judders at steady speed.
What is GM’s fix?
A full flush of the transmission and converter with an updated fluid, per GM’s bulletin. Ask a dealer to check your VIN.
Can I just drain and fill it?
A drain and fill only replaces part of the fluid. The bulletin calls for a full flush.
Will the shudder damage the transmission?
Long-term shuddering can damage the torque converter, so get it fixed early.
Which GM vehicles are affected?
Mainly 2015–2019 trucks and SUVs with the 8L90 or 8L45 eight-speed automatic.
Does it need a software update too?
Sometimes. A dealer can check whether a newer calibration is available for your VIN.
See also GM, Chevrolet & GMC Repair, Transmission Fluid Service, Transmission Repair Cost, Vibration at Highway Speed.
Prefer to Have It Done? Radman Auto Repair, Etobicoke
Independent auto repair in Etobicoke since 1999. We fix what this guide covers, explain what we find, and keep the old parts for you to see.
This Service Includes
✓ Shudder diagnosis and scan
✓ Transmission fluid exchange
✓ Adaptive relearn
✓ Road test