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04 Pontiac Bonneville and the service stability system light is on Why?

The service stability system (SSS) light on a 2004 Pontiac Bonneville indicates a problem with the vehicle's stability control system. There are many possible reasons why this light is illuminated, ranging from minor to serious. Here are some of the most common causes:

* Low tire pressure: Uneven tire pressure can trigger the SSS light because it affects the vehicle's handling and stability. Check your tire pressure and inflate them to the recommended pressure (found in your owner's manual or on a sticker inside the driver's side doorjamb).

* Faulty wheel speed sensor: These sensors monitor the speed of each wheel. A malfunctioning sensor can provide inaccurate data to the stability control system, causing the light to come on.

* Steering angle sensor problem: This sensor measures the angle of the steering wheel. A faulty sensor can lead to inaccurate readings and trigger the SSS light.

* Brake system issues: Problems with the anti-lock braking system (ABS) or other brake components can also affect the stability control system and illuminate the SSS light. This could include low brake fluid, a faulty ABS sensor, or a problem with the hydraulic control unit.

* Faulty mass airflow sensor (MAF): While less common, a faulty MAF sensor can affect engine performance and in turn, trigger the stability control system light.

* Faulty traction control module (TCM): The TCM is the brain of the stability control system. A malfunctioning TCM is a more serious issue.

* Wiring problems: Damaged or corroded wiring related to any of the above components can also cause the light to illuminate.

* Low battery voltage: A weak battery can sometimes cause unexpected warning lights, including the SSS light.

What to do:

1. Check the obvious: First, check your tire pressure. If it's low, inflate the tires and see if the light goes off. You might need to drive for a short time for the system to reset.

2. Have it scanned: The most reliable way to determine the cause is to have the vehicle's onboard diagnostic (OBD-II) system scanned by a mechanic or using an OBD-II scanner. The scan will provide a diagnostic trouble code (DTC) that pinpoints the problem.

3. Don't ignore it: Driving with the SSS light on means your stability control system isn't functioning correctly. This can significantly reduce your vehicle's ability to handle unexpected situations, making it more prone to accidents. Get it checked as soon as possible.

Without a diagnostic scan, it's impossible to say definitively what's wrong. A professional diagnosis is recommended.