Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2018SONIC PREMIER, 4D SEDAN, AUTOMATIC TRANSREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSMISSION - 6T30 (MH9) OR 6T40 (MH8) - REPAIR INSTRUCTIONS - ON VEHICLE
2018 Chevrolet Sonic Premier, 4D Sedan, Automatic Trans
Automatic Transmission - 6T30 (MH9) Or 6T40 (MH8) - Repair Instructions - On Vehicle
2018 Chevrolet Sonic Premier, 4D Sedan, Automatic TransSECTION Automatic Transmission - 6T30 (MH9) Or 6T40 (MH8) - Repair Instructions - On Vehicle
- Repair Instructions - On Vehicle
- Transmission Adaptive Values Learn
- Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement
- Transmission Control Lever Knob Replacement
- Control Lever Release Pushbutton Replacement
- Transmission Control Replacement
- Automatic Transmission Range Selector Lever Replacement
- Range Selector Lever Cable Replacement
- Range Selector Lever Cable Adjustment
- Range Selector Lever Cable Bracket Replacement
- Transmission Fluid Drain and Fill
- Automatic Transmission Fluid Pressure Test Hole Plug Replacement
- Front Wheel Drive Shaft Seal Replacement - Left Side
- Front Wheel Drive Shaft Seal Replacement - Right Side
- Manual Shift Shaft and Seal Replacement
- Control Solenoid Valve and Transmission Control Module Assembly Replacement
- Control Valve Body Cover Replacement
- Control Valve Body Replacement
- Output Speed Sensor Replacement
- Input Speed Sensor Replacement
- Transmission Mount Bracket Replacement - Rear
- Transmission Mount Bracket Replacement - Left Side (LUJ, LUV)
- Transmission Mount Replacement - Left Side
- Transmission Rear Mount Replacement
- Transmission Replacement (With 1.4L Engine)
- Transmission Replacement (With 1.8L Engine)
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.