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2016 Buick Regal - Stabilitrak Light & Power Steering Assist Reduced

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Chris P. · rep 0 · May 22, 3:51 AM · 1 replies · solved · Question

Vehicle: 2016 Buick Regal GS

My 2016 Buick Regal GS has suddenly started acting up. The 'Service StabiliTrak' message keeps popping up on the dash, along with 'Power Steering Assist Reduced.' When this happens, the steering becomes noticeably heavier, almost like there's no power assist at all.

It's intermittent, sometimes it clears after restarting the car, but it always comes back. I haven't hit any potholes or had any recent work done. I'm worried about driving it like this.

Could this be a sensor issue, or something more serious with the power steering system? Are there any common electrical faults that link these two warnings on the Regal?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:51 AM

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ClearTheCode admin answer:

The 'Service StabiliTrak' and 'Power Steering Assist Reduced' messages appearing together on your 2016 Buick Regal GS are a strong indicator of an issue within the vehicle's electronic power steering (EPS) system or a related sensor. These systems are highly integrated, and a fault in one can trigger warnings in others.

Here are the most common causes and what to consider:

  1. Electronic Power Steering (EPS) Module Failure:

    • This is a very common cause. The EPS system relies on an electronic control module and an electric motor to provide steering assist. A fault within the module or motor can lead to reduced assist and trigger related warnings.
    • Symptoms: Intermittent or complete loss of power steering, accompanied by the specific warning messages.

  2. Steering Angle Sensor (SAS) Fault:

    • The SAS tells the StabiliTrak and EPS systems the position of the steering wheel. If this sensor is faulty or out of calibration, it can confuse both systems, leading to errors.
    • Symptoms: StabiliTrak light, sometimes power steering issues, and potentially other traction control warnings.

  3. Wheel Speed Sensor Issues:

    • While less direct, StabiliTrak relies on accurate wheel speed data. A faulty wheel speed sensor (often integrated with the ABS sensor) can cause StabiliTrak errors, which might indirectly affect the EPS system's calculations, especially if the vehicle's computer is trying to compensate for perceived instability.

  4. Low Battery Voltage / Charging System Issues:

    • The EPS system draws a significant amount of electrical power. If your battery is weak or the charging system (alternator) is failing, it might not provide enough stable voltage for the EPS to operate correctly, especially under load. This can trigger various electrical warnings.

What to Do:

  • Check Battery: Ensure your battery is fully charged and in good health. A weak battery can cause a cascade of electrical issues.
  • Visual Inspection: Look for any obvious signs of damage or loose connections around the steering column and under the hood.

When to See a Shop: Given the safety implications of reduced power steering, it's crucial to have your Regal inspected by a professional immediately. A qualified mechanic or Buick dealership will have specialized diagnostic tools (like a Tech2 or GDS2 scanner) to read specific fault codes from the EPS module, StabiliTrak module, and other related systems. Common codes might include C0561 (System Disabled Information), C0475 (Steering Assist Motor Circuit), or C0545 (Steering Wheel Angle Sensor). These codes will pinpoint the exact component that needs attention, whether it's a sensor, the EPS module, or wiring.

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