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, STANDARD TRANSREPAIR AND DIAGNOSISBODY & FRAMEIGNITION SWITCH/STEERING LOCKIMMOBILIZER SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B3902CIRCUIT/SYSTEM VERIFICATION
2018 Chevrolet Sonic Premier, 4D Sedan, Standard Trans
Circuit/System Verification
2018 Chevrolet Sonic Premier, 4D Sedan, Standard TransSECTION Circuit/System Verification
- Perform the Programming and Setup procedure for the control module that set DTC B3902.NOTE:
When performing the following step, Immobilizer System Component Programming, the module may also need to be reset by using the SPS function Prepare For Removal.
- Perform the Immobilizer System Component Programming Immobilizer System Component Programming (without BTM) Immobilizer System Component Programming (with BTM) .
- Verify DTC B3902 does not set after programming.
- If the DTC sets after programming
Replace the control module that set the DTC.
- Go to next step: If the DTC does not set after programming
- If the DTC sets after programming
- All OK.
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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.