2017–2019 Chevrolet Colorado: Shudder or vibration at steady speeds (8-speed 8L45)
Likely causes, ranked
- Original transmission fluid (moisture-sensitive)Shop
- Torque converter clutchShop
Real-owner fix counts will appear here as reports come in.
DIY or shop: See DIY or shop section
Parts to check
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Symptom: A shudder or rumble strip feel at light throttle, often around 25–80 mph, when the torque converter locks.
Likely causes
- Fluid. GM's bulletin calls for a full fluid exchange with the updated fluid, not a simple drain-and-fill. ColoradoFans owners report it fixing the problem.
- Torque converter. When shudder returns after the exchange, owners report torque converter replacement next.
DIY or shop?
Dealer. It's often covered under powertrain warranty while in coverage.
Useful steps
- Ask for the 18-NA-355 fluid exchange.
- Document repeat shudder.
- Ask about torque converter replacement if it returns.
Vehicle focus: 2017–2019 Chevrolet Colorado.
Safety / mechanic note
None
2015–2022 maintenance schedule for the Chevrolet Colorado
Recalls & service bulletins
Technical service bulletins
- 18-NA-355 GM's fix for 8-speed shudder at about 25–80 mph under light throttle: a full transmission fluid exchange with updated Mobil 1 LV ATF HP. Details
NHTSA complaints: 225 keyword-matched complaints for Chevrolet COLORADO 2017–2019 (of 547 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-15).
Always check your VIN for open recalls at nhtsa.gov/recalls.
Sources
What actually fixed it?
Had this problem? Tell other owners what the real fix was. Reports are counted above; we never show made-up numbers.