Some Chevrolet Impala owners report experiencing issues where the engine continues to crank even after the key has been removed. This problem may be linked to the security system, particularly if the Pass Key light remains illuminated after attempting to start the engine. Additionally, issues with the ignition switch or starter relay could lead to continuous power being supplied to the solenoid, keeping the starter engaged. Some owners have noted that a slow or weak engine crank may indicate underlying problems with the starter or battery. Furthermore, a worn key or malfunctioning ignition switch could inadvertently trigger the passlock system, resulting in persistent cranking. It is recommended for owners facing these issues to consult a qualified mechanic for proper diagnosis and resolution.

Some Chevrolet Impala 2016 owners report experiencing starting issues despite having a fully charged battery and intact mini fuses. These owners have noted that the car may inaccurately indicate no fuel, even when the tank is nearly full. Additionally, some report unexpected servicing alerts for the stability track and power steering, which were previously functional. Common causes for the starting problems include dead batteries, alternator issues, or failed starters. Owners experiencing hard starts, slow cranking, or clicking noises are advised to rule out problems such as loose battery connections or poor ground connections before replacing the battery. Furthermore, if the starter is not receiving adequate power, the engine may fail to start, prompting recommendations to inspect the power cable and connections to the starter motor. It is crucial for owners to check the alternator, starter, and battery connections to accurately diagnose and resolve the starting issues.