C1105 — Traction Control Disable Lamp - Circuit Short to Battery

Will C1105 clear itself?

Sometimes C1105 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

Is it safe to drive with C1105?

The base brakes usually still work, so careful driving is possible — but ABS and stability control are disabled, which lengthens stopping distances on slippery roads. Fix promptly and avoid harsh driving.

How do I diagnose C1105 myself?

Start with a scan: confirm C1105, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the ABS / stability control, and verify the suspect component against live data before buying parts.

What are the symptoms of C1105?

Drivers most often notice: ABS not operating during hard braking, brake pedal pulsation changes, speedometer or cruise control issues, ABS or ESC warning light on.

How much does it cost to fix C1105?

Repair sensor wiring — $80–$250; ABS module repair or replacement — $400–$1,200; Replace a wheel speed sensor — $120–$350. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

When the engine control module detects a voltage condition that shouldn't be present in the traction control disable lamp circuit, it logs OBD2 code C1105. Specifically, this code indicates a short to battery voltage somewhere in the wiring or components that control the traction control disable indicator. The problem lives in the chassis electronics rather than the engine itself, which means it's tied to the anti-lock braking system and stability control network.

The ABS module constantly watches the status of the traction control disable lamp circuit. Normally, this circuit grounds the lamp when traction control is actively preventing wheel slip. When a short to battery occurs, the module sees unexpected voltage on a circuit that should either be grounded or floating. After confirming the fault persists through multiple drive cycles, the module stores C1105 and illuminates the warning light. The freeze frame data captured with this code tells you exactly what the vehicle was doing—speed, engine load, temperature, and RPM—when the module first detected the problem.

This matters because the traction control disable lamp shares its circuit with other stability control components. A short that triggers C1105 can affect how the ABS module interprets data from the wheel speed sensors, potentially disrupting the entire stability control system even if the sensors themselves are healthy.

Common Symptoms of C1105

• Traction control disable lamp stays illuminated regardless of driving conditions
• ABS warning light activates alongside the traction control indicator
• Stability control disabled message appears in the instrument cluster
• Speed-sensitive systems like cruise control become unreliable or shut off
• Speedometer readings become erratic or inaccurate
• Brake pedal behavior feels different during hard stops
• Traction control fails to engage when needed on low-traction surfaces

What Causes C1105?

Wheel speed sensors fail more often than any other component in this circuit. These sensors sit at each wheel hub and generate signals the ABS module uses to calculate wheel slip. When one degrades, it sends corrupted data that the module interprets as a traction control system fault, triggering C1105. Wiring problems rank second—chafed insulation where the harness bends near the wheel wells exposes copper to road salt and moisture, creating shorts that feed phantom voltage into the circuit. The ABS module itself occasionally fails and reports false faults. Tone ring damage—bent teeth, metal debris accumulation, or corrosion—distorts the signal the sensor reads. Corroded sensor connectors introduce resistance and intermittent contact that the module flags as a circuit problem.

How to Diagnose C1105

1. Connect an OBD2 scanner and confirm C1105 is stored, then save the freeze frame data immediately. This snapshot shows the exact conditions—vehicle speed, engine load, coolant temperature, and RPM—when the fault first appeared.

2. Scan for all related codes in the ABS and chassis categories. Codes like C1100 through C1104 often accompany C1105 and point toward the actual failing component rather than just the symptom code.

3. Perform a visual inspection of all four wheel speed sensor harnesses. Look for damaged insulation, rubbed spots from contact with suspension components, and corrosion at the connector pins.

4. With the scanner displaying live wheel speed PIDs, raise each wheel off the ground and spin it by hand. The corresponding PID should match the other wheels within reasonable tolerance. A sensor that drops out, reads zero, or shows implausible values is faulty.

5. Remove each sensor and examine the tone ring through the opening. Clean any accumulated metal debris with compressed air and inspect the ring teeth for bending or damage.

6. Clear the code and complete a drive cycle that reproduces the conditions recorded in the freeze frame. If C1105 does not return, the issue was intermittent or electrical noise. If it returns, the fault is confirmed and hardware replacement is necessary.

Repair Options and Costs

Repair costs for C1105 vary widely depending on which component is actually at fault. Typical scenarios at independent shop rates:

• Sensor wiring repair: $80–$250
• Wheel speed sensor replacement: $120–$350
• ABS module repair or replacement: $400–$1,200

The cheapest repairs involve fixing damaged wiring insulation or connector corrosion. Wheel speed sensor replacement costs more but the part itself is relatively inexpensive—most sensors run $50–$150 each with 30–60 minutes of labor. The ABS module is the most expensive component and is usually only replaced after other causes are ruled out.

Total Cost to Fix C1105

Overall, fixing C1105 typically runs between $80 and $1,200 depending on the root cause. Most vehicles end up needing either a wheel speed sensor or wiring repair, both of which fall on the lower end of that range. The ABS module replacement scenario—the most expensive fix—should only be considered after confirming the module itself is faulty, not just reacting to the stored code. A systematic diagnosis before purchasing parts almost always saves money.

Driving Safety Verdict

C1105 warrants a caution severity rating. Standard hydraulic brakes continue functioning normally, so you can still stop the vehicle. However, the ABS and stability control systems are effectively disabled or operating with unreliable data, which means longer stopping distances on wet or icy roads and reduced ability to correct skids. This is not an emergency breakdown, but it is a safety system impairment that should be addressed before driving in adverse conditions or at highway speeds.

Related OBD2 codes

• C1100: ABS Pump Switch Circuit Failure
• C1101: ABS Hydraulic Valve Circuit Failure
• C1102: ABS Acceleration Switch Circuit Failure
• C1103: ABS Hydraulic Brake Switch Circuit Failure
• C1104: Traction Control Active Lamp - Circuit Short to Battery