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2016 ATS-V Stabilitrak/ABS Lights & Reduced Engine Power

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Emily N. · rep 0 · May 22, 4:00 AM · 1 replies · solved · Question

Vehicle: 2016 Cadillac ATS-V

Hello, I'm experiencing a concerning issue with my 2016 Cadillac ATS-V. Intermittently, the Stabilitrak and ABS warning lights will illuminate on the dash. Sometimes, when this happens, I also get a 'Reduced Engine Power' message, and the car feels sluggish.

It seems to happen more often when I'm driving over bumps or uneven roads, but it's not consistent. I've heard these issues can be related to wheel speed sensors. Could that be it, or is there something else I should be looking at? It's really impacting my confidence in the car.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:00 AM

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ClearTheCode admin answer:

The combination of Stabilitrak, ABS warning lights, and 'Reduced Engine Power' in your 2016 Cadillac ATS-V is a classic indicator of a fault within the vehicle's wheel speed sensor system or the ABS/Stabilitrak control module. The system relies on accurate wheel speed data to function correctly, and any disruption can trigger these warnings.

Common Causes:

  1. Faulty Wheel Speed Sensor: These sensors (also known as ABS sensors) can fail due to internal defects, damage from road debris, or corrosion.
  2. Damaged Wiring/Connectors: The wiring harness leading to the wheel speed sensors can become frayed, corroded, or disconnected, especially near the wheels where they are exposed to the elements and movement.
  3. Dirty Sensor/Tone Ring: Accumulation of dirt, rust, or metallic particles on the sensor or the magnetic tone ring (which the sensor reads) can interfere with accurate readings.
  4. ABS Control Module Failure: Less common, but the ABS/Stabilitrak control module itself can malfunction, leading to communication errors or incorrect processing of sensor data.
  5. Low Battery Voltage: While not a direct cause, low voltage can sometimes trigger various module warnings.

Relevant OBD-II Codes:

  • C0035 - C0050: These codes typically indicate a fault with a specific wheel speed sensor circuit (e.g., C0035 for Left Front Wheel Speed Sensor).
  • U0401: Invalid Data Received from ECM/PCM (can sometimes be related to communication issues affecting engine power).
  • P2138: Accelerator Pedal Position Sensor 1-2 Correlation (less common, but can cause reduced power and sometimes trigger other warnings if related to a shared circuit).

Troubleshooting Steps:

  1. Visual Inspection: Inspect all four wheel speed sensors and their wiring harnesses for any visible damage, fraying, or loose connections. Check for excessive dirt or debris around the sensor and tone ring.
  2. Diagnostic Scan: Use an OBD-II scanner to read any stored C-codes (chassis codes). These codes will often pinpoint which specific wheel speed sensor or circuit is experiencing a fault.
  3. Check Battery: Ensure your battery is fully charged and in good health. A weak battery can sometimes cause erratic electrical behavior.

When to See a Shop: If you've identified specific C-codes or if the issue persists after a visual inspection, it's best to take your ATS-V to a qualified mechanic or Cadillac dealership. Diagnosing wheel speed sensor issues often involves testing sensor resistance, voltage, and signal output, which requires specialized tools. If the issue is with the ABS module, it's a more complex repair that should be handled by professionals due to its critical role in vehicle safety.

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