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 DIAGNOSISBODY & FRAMEIGNITION SWITCH/STEERING LOCKIMMOBILIZER SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B302ACIRCUIT/SYSTEM VERIFICATION
2025 Chevrolet Trailblazer ACTIV, FWD
Circuit/System Verification
2025 Chevrolet Trailblazer ACTIV, FWDSECTION Circuit/System Verification
- Verify the OnStar system is not damaged and is operating properly, with no DTCs set.
- If the OnStar system is damaged, inoperative, or any OnStar DTCs are set
These concerns must be corrected before the start disable can be removed.
- Go to next step: If the OnStar system is not damaged and is operating properly
- If the OnStar system is damaged, inoperative, or any OnStar DTCs are set
- Press the blue OnStar button and ask the advisor to be transferred to the stolen vehicle team to verify the vehicle account has been updated.
- Verify that OnStar is aware the vehicle has been recovered and that the vehicle account has been updated.
- If OnStar has not been notified that the vehicle has been recovered
Contact the customer and advise them that for security purposes, they must contact OnStar and the law enforcement agency to update the vehicle account.
- Go to next step: If the account has been properly updated
- If OnStar has not been notified that the vehicle has been recovered
- Once the vehicle account has been updated and the start disable request has been removed, DTC B302A will transition to a history DTC. Clear the history DTC.
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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.