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2017 Canyon ABS & Traction Control Lights On - Hard Brake Pedal

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Mike T. · rep 0 · May 25, 2:38 AM · 1 replies · solved · Question

Vehicle: 2017 GMC Canyon SLT

Hey everyone, I'm having an issue with my 2017 GMC Canyon SLT. The ABS light and the Traction Control light both came on a few days ago, and they've stayed on. What's more concerning is that sometimes the brake pedal feels really hard, almost like I've lost power assist, and it takes a lot more effort to stop the truck.

I've tried turning the truck off and on, but the lights just come back on. I don't have an OBD scanner that can read ABS codes, just a basic engine one. I'm worried about driving it like this, especially with the hard pedal.

Has anyone experienced this with their Canyon? What could be causing both lights to come on and affect the brakes like this? Any advice would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:38 AM

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ClearTheCode admin answer: When both your ABS and Traction Control lights illuminate, it indicates a fault within the Anti-lock Braking System, which often impacts the Traction Control system as they share sensors and components. The hard brake pedal is a critical symptom that suggests a more serious issue affecting brake assist.

Here are the common causes and steps:

  1. Wheel Speed Sensor Failure: This is a very common cause. A faulty wheel speed sensor (WSS) sends incorrect data to the ABS module, leading to both lights coming on. Common diagnostic trouble codes (DTCs) related to this include C0035, C0040, C0045, or C0050, indicating a specific wheel speed sensor issue (e.g., C0040 for Right Front Wheel Speed Sensor).
  2. ABS Module Failure: Less common but possible, the ABS control module itself could be faulty. This module processes sensor data and controls the ABS pump.
  3. Brake Pressure Sensor/Switch: Issues with the brake pressure sensor can also trigger these lights and affect brake performance.
  4. Vacuum Leak/Booster Issue: The hard brake pedal symptom points strongly towards a problem with the brake vacuum assist system. This could be a vacuum leak, a faulty vacuum pump (if equipped), or a failing brake booster. If the booster isn't getting enough vacuum, the pedal will be very stiff.

When to See a Shop:

  • Immediately. A hard brake pedal significantly compromises your ability to stop the vehicle safely.
  • You need to get the vehicle scanned with an advanced OBD-II scanner capable of reading ABS-specific codes. This will pinpoint the exact fault.
  • A professional technician will diagnose the specific DTCs, inspect the wheel speed sensors and wiring, check the brake booster and vacuum system, and test the ABS module. Do not delay in getting this checked, as it's a critical safety concern.
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