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2021 QX80 ABS and Traction Control Lights On - C1103 Code

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Robert C. · rep 0 · May 22, 5:06 AM · 1 replies · solved · Question

Vehicle: 2021 Infiniti QX80 Sensory

Hi all,

My 2021 Infiniti QX80 Sensory just threw a couple of warning lights: the ABS light and the Traction Control light are both illuminated on the dash. I hooked up my OBD-II scanner, and it's showing a C1103 code, which points to a right front wheel speed sensor circuit.

I haven't noticed any strange braking behavior or issues with traction, but obviously, these lights being on are concerning. Is this usually just a faulty sensor, or could it be something more involved like wiring or the ABS module itself? Any advice on how to proceed?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:06 AM

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ClearTheCode admin answer:

The C1103 code specifically indicates an issue with the Right Front Wheel Speed Sensor Circuit. This is a common problem that can trigger both the ABS and Traction Control lights, as these systems rely heavily on accurate wheel speed data.

Troubleshooting Steps:

  1. Visual Inspection: Carefully inspect the right front wheel speed sensor and its wiring harness. Look for any signs of physical damage, corrosion, frayed wires, or loose connections. The sensor is typically located near the wheel hub and brake assembly.
  2. Clean the Sensor: Road grime, brake dust, and metallic particles can sometimes accumulate on the sensor tip, interfering with its reading. Gently clean the sensor with a non-residue electrical cleaner.
  3. Check Resistance (Advanced): If you have a multimeter, you can test the resistance of the sensor. Consult a service manual for the correct resistance values for your specific QX80 model. An open circuit or extremely high resistance indicates a faulty sensor.
  4. Verify Wiring Continuity: Check the wiring harness leading from the sensor back to the ABS module for continuity. Look for breaks or shorts in the wires, especially where they might be exposed to movement or road debris.

Common Causes for C1103:

  • Faulty Wheel Speed Sensor: This is the most frequent cause. Sensors can fail internally due to age, heat, or vibration.
  • Damaged Wiring Harness: The wiring can be cut, chafed, or corroded, leading to an intermittent or complete loss of signal.
  • Corrosion at Connector: Moisture or debris can get into the electrical connector, causing poor contact.
  • Damaged Tone Ring/Reluctor Wheel: Less common, but if the magnetic tone ring (which the sensor reads) is damaged or clogged with debris, it can cause incorrect readings.

When to See a Shop:

While a faulty sensor is often a straightforward replacement, diagnosing wiring issues or a damaged tone ring can be more complex. If a visual inspection and cleaning don't resolve the issue, or if you're not comfortable with electrical testing, it's best to have your Infiniti QX80 inspected by a professional technician. They can use advanced diagnostic tools to monitor live wheel speed data, perform specific circuit tests, and accurately determine if the sensor, wiring, or (rarely) the ABS control module itself is at fault. Driving with these lights on means your ABS and Traction Control systems may not function correctly, which is a safety concern.

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