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 MANUALSCHEVROLET2025TRAILBLAZER ACTIV, FWDREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSSHIFT LOCK CONTROL SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B270ACOMPONENT TESTING
2025 Chevrolet Trailblazer ACTIV, FWD
Component Testing
2025 Chevrolet Trailblazer ACTIV, FWDSECTION Component Testing
- Ignition/Vehicle - Off
- Disconnect the electrical connector: S3 Transmission Shift Lever
- Connect a 3 A fused jumper wire between the test points: Control terminal 1 & 12 V
- Momentarily connect a jumper wire between the test points: Ground terminal 4 & Ground
Verify the component produces a clicking sound: M7 Transmission Shift Lock Control Solenoid Actuator
- If the component does not produce a sound
Replace the component: S3 Transmission Shift Lever
- Go to next step: If the component produces a sound
- If the component does not produce a sound
- All OK.
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.