What does it mean when the check engine light flashs in a 2002 Chevy Express van?

A flashing check engine light on a 2002 Chevy Express van indicates a serious problem that requires immediate attention. Unlike a steadily illuminated light, which suggests a problem that can be addressed later, a flashing light means there's a potentially damaging issue that could cause significant engine damage if you continue driving.

This often points to a misfire in one or more cylinders. A misfire can lead to:

* Catalyst damage: Unburnt fuel entering the catalytic converter can overheat and damage it, leading to expensive repairs.

* Engine damage: Continued misfiring can cause damage to pistons, valves, and other internal engine components.

Do not ignore a flashing check engine light. Pull over safely as soon as possible and have the vehicle towed or inspected by a mechanic. Driving with a flashing check engine light significantly increases the risk of serious engine damage.

While a diagnostic scan is necessary to pinpoint the exact cause, the flashing light itself should be considered a warning to avoid further driving until the problem is diagnosed and fixed.