Here's why it's serious:
* Loss of Anti-lock Braking System (ABS): The most obvious consequence is that your ABS is disabled. This means during hard braking, your wheels might lock up, leading to loss of steering control and increased stopping distance. This is especially dangerous in slippery conditions (rain, snow, ice).
* Underlying Mechanical Issues: The ABS light doesn't just illuminate randomly. It indicates a malfunction within the ABS system. This could be anything from a faulty sensor to a more significant problem within the hydraulic or electronic components of the system. Ignoring it could lead to more extensive and costly repairs later.
* Safety Inspection Failure: In many areas, a malfunctioning ABS system will result in a failure during a safety inspection.
* Increased Insurance Premiums: Some insurance companies might raise your premiums if they know about a known and unfixed malfunction in a key safety system like the ABS.
In short: While you can technically drive the truck, it's strongly advised to have the ABS system diagnosed and repaired as soon as possible. Driving with a malfunctioning ABS significantly increases your risk of being involved in an accident. Ignoring it could lead to much more expensive repairs down the road.