C0106 DTC: Traction Control System Circuit Range/Performance

OBD2 trouble code C0106 indicates that the ABS/Traction Control System (TCS) control module has detected that the traction control system circuit is operating outside its expected performance range. The circuit remains functional but its voltage, current, or response time is outside manufacturer specifications.

What Does C0106 Mean?

The Traction Control System continuously monitors electrical signals from wheel speed sensors, the ABS hydraulic unit, and other related components. If the module detects abnormal circuit performance rather than a complete electrical failure, it stores DTC C0106 and may reduce or disable traction control operation.

Typical System Diagram

Wheel Speed Sensors
    │
    ▼
ABS / TCS Control Module
    ├── Hydraulic Control Unit
    ├── CAN Bus
    └── Instrument Cluster

Common Symptoms

• Traction Control warning light ON.
• ABS warning lamp illuminated.
• Electronic Stability Control may be disabled.
• Traction control responds inconsistently.
• Wheel spin during acceleration.
• Additional ABS or communication DTCs may be stored.

Possible Causes

• High resistance in the traction control circuit.
• Loose or corroded electrical connectors.
• Damaged wiring harness.
• Weak battery or unstable charging voltage.
• Faulty wheel speed sensor.
• Defective ABS/TCS control module.
• CAN bus communication problems.

Driving Risk Level

Risk Level: Medium

The vehicle usually remains drivable, but traction control and stability assistance may not operate correctly. Vehicle handling can become less stable on wet, snowy, or gravel-covered roads.

Repairing the fault promptly helps restore full safety system performance.

Diagnostic Flow Chart

Scan ABS/TCS Module

↓

Review Freeze Frame Data

↓

Inspect Wiring And Connectors

↓

Measure Voltage, Resistance And Grounds

↓

Repair Fault And Verify Operation

Oscilloscope Diagnostic Test

An oscilloscope can verify wheel speed sensor output, detect intermittent voltage drops, and evaluate CAN communication quality. Performance-related faults are often easier to identify using waveform analysis than with a digital multimeter.

Normal Signal __|‾|__|‾|__|‾|__|‾|__

Performance Fault __|‾|___|‾‾|____|‾|____

Electrical Testing (Typical Values)

Battery Voltage	12.4–12.8 V (Engine Off)
Charging Voltage	13.5–14.8 V
Ground Resistance	Less than 0.2 Ω
Circuit Resistance	Near 0 Ω

Scanner Live Data

• ABS Module Status
• Traction Control Status
• Wheel Speed Sensor Values
• Battery Voltage
• Brake Switch Status
• CAN Communication Status

Estimated Repair Cost

Diagnostic Scan	$50–$120
Wheel Speed Sensor Replacement	$100–$350
Wiring Repair	$80–$300
ABS/TCS Module Replacement	$500–$1,500+

Professional Diagnostic Tips

• Measure voltage drop under load rather than only checking static voltage.
• Inspect connectors for corrosion or loose terminals.
• Compare live wheel speed sensor data during a road test.
• Use an oscilloscope to identify unstable or distorted signals.
• Clear DTCs and confirm the repair with a road test.

Common Repairs

• Repair damaged wiring.
• Replace faulty wheel speed sensors.
• Clean or replace corroded connectors.
• Repair charging system issues.
• Replace the ABS/TCS control module if testing confirms failure.

Related DTC Codes

• C0100 – Traction Control System Malfunction
• C0101 – Traction Control System Performance
• C0102 – Traction Control System Circuit Low
• C0103 – Traction Control System Circuit High
• C0104 – Traction Control System Circuit Intermittent
• C0105 – Traction Control System Circuit Failure

FAQ

Can poor electrical connections trigger C0106?

Yes. High resistance caused by loose or corroded connectors is one of the most common reasons for a circuit range/performance fault.

Can I continue driving with C0106?

Yes, but traction control and electronic stability assistance may not function correctly. Vehicle stability can be reduced on low-traction surfaces, so prompt diagnosis is recommended.