Chevrolet Cobalt Service & Repair Manual: Passkey Module

On models equipped with the Passkey Theft Deterrent System, a new password must be learned by the PCM when the BCM/PCM has been replaced. When the PCM is replaced, the EEPROM calibration is flashed into the new PCM. Refer to latest GM Techline or equivalent information for PCM programming. After EEPROM calibration is complete, perform the following procedure:
1. Attempt to start vehicle, vehicle will stall.
2. Leave ignition On until Theft System warning lamp turns Off.
3. Turn ignition Off.
4. Attempt to start vehicle. Password is now learned and vehicle will now start.
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    Chevrolet Cobalt Owners Manual

    Chevrolet Cobalt Service Manual

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