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 LS, 1.8L ENG VIN H, AUTOMATIC TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEDOOR LOCKSIMMOBILIZER SYSTEMREPAIR INSTRUCTIONSKEY WITH INTEGRATED TRANSMITTER PROGRAMMING (WITHOUT BTM)REPLACING KEYS (WITHOUT SPS) - UNITED STATES AND MEXICO ONLY
2018 Chevrolet Sonic LS, 1.8L Eng VIN H, Automatic Trans
Replacing Keys (Without SPS) - United States and Mexico only
2018 Chevrolet Sonic LS, 1.8L Eng VIN H, Automatic TransSECTION Replacing Keys (Without SPS) - United States and Mexico only
NOTE:
- If no keys are present this procedure requires programming 2 keys during the same programming event or the vehicle will not exit the procedure.
- This procedure should be used without existing learned keys being present.
- A total of eight keys may be learned to a single vehicle.
- This procedure will only learn the vehicle key information. This procedure will not learn any immobilizer information between the body control module (BCM) and engine control module (ECM).
- If the battery voltage is low, charge the battery before continuing with the procedure.
- With an unlearned master vehicle key, turn ON the ignition, with the engine OFF.
- Observe the security indicator, after approximately 10 min the indicator will turn off.
- Turn OFF the ignition and wait 5 s.
- Repeat steps 1 - 3 two more times for a total of 3 cycles or 30 min.
- Start the vehicle. The vehicle has now learned the key transponder information.
- Additional keys may be learned using the Adding Keys procedure.
- Clear all DTCs.
NOTE:
The body control module learns the key transponder information upon the ignition transition from OFF to ON. You must turn the ignition OFF before attempting to start the vehicle.
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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.