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 TRANSSHIFT LOCK CONTROL SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B270ACOMPONENT TESTING
2018 Chevrolet Sonic Premier, 4D Sedan, Automatic Trans
Component Testing
2018 Chevrolet Sonic Premier, 4D Sedan, Automatic TransSECTION Component Testing
- Ignition OFF, disconnect the harness connector at the S3 Transmission Shift Lever.
- Install a 3 A fused jumper wire between the control terminal 4 and 12 V. Momentarily install a jumper wire between the ground terminal 2 and ground.
- Verify the solenoid turns on and off/clicks, etc.
- If the solenoid does not turn on and off/clicks, etc.
Replace the S3 Transmission Shift Lever.
- Go to next step: If the solenoid does turn on and off/clicks, etc.
- If the solenoid does not turn on and off/clicks, etc.
- All OK
RENDER: 1.0x
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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.