Chevrolet Express 2500 persistent flashing check engine light with no error codes found on Chevrolet Express 2500

Some Chevrolet Express 2500 owners report experiencing a persistent flashing check engine light without any error codes, indicating serious underlying issues that should not be ignored. This condition may be caused by serious engine misfires due to problems such as a dirty fuel filter, faulty fuel injectors, bad spark plugs, ignition coils, or problematic spark plug wires. Additionally, a flashing check engine light can signal a catalyst-damaging misfire, which poses a risk of harming the catalytic converter and O2 sensors if not addressed promptly. In some instances, owners may find that a catastrophic misfire leads to raw fuel being dumped into the exhaust system, potentially damaging the catalytic converter and causing backfiring issues. To mitigate these risks, it is recommended that owners conduct a diagnostic check with a code reader, seek professional inspection if the cause remains unclear, and ensure regular maintenance checks to prevent issues that could trigger a flashing check engine light.