How severe is fault code C1107?

Serious — Stop or limit driving

OBD Code C1107: ABS Function Enabled Input Circuit Failure

Q: What does OBD code C1107 mean?

ABS Function Enabled Input Circuit Failure. Your ABS (anti-lock braking) system has lost its 'on' signal, like a light switch that won't turn on the lamp. The control module can't tell if ABS is supposed to be active, so it disables the system for safety.

Q: What are the symptoms of fault code C1107?

ABS warning light illuminated on dashboard, ABS function disabled; brakes lock up during hard braking, Loss of traction control function

Q: How do I fix OBD fault code C1107?

Clean corrosion from battery posts and check all ground connections to the ABS module.. Disconnect and reconnect the ABS control module harness to reseat contacts and eliminate poor connections.. Inspect the enable signal wiring from ignition switch to ABS module for damage, and test/replace the ABS relay if accessible.

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What This Actually Means

In plain language — no jargon

Your ABS (anti-lock braking) system has lost its 'on' signal, like a light switch that won't turn on the lamp. The control module can't tell if ABS is supposed to be active, so it disables the system for safety.

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Symptoms You May Notice

3 known symptoms for this code

ABS warning light illuminated on dashboard

ABS function disabled; brakes lock up during hard braking

Loss of traction control function

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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ABS module monitors a discrete enable input signal from the ignition or control module that confirms ABS should operate. When this signal voltage drops below threshold or disappears entirely, the ECU logs a fault and disables ABS to prevent unpredictable braking behavior.

Voltage & Parameter Thresholds

Parameter	Normal Range	Fault Condition
ABS Enable Signal Voltage	12V (or circuit engaged)	<2V or open circuit
Signal Continuity	Continuous during operation	Intermittent or absent

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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex

1

Battery terminals and connectors

Clean corrosion from battery posts and check all ground connections to the ABS module.

2

ABS module connector

Disconnect and reconnect the ABS control module harness to reseat contacts and eliminate poor connections.

3

Wiring harness and relay

Inspect the enable signal wiring from ignition switch to ABS module for damage, and test/replace the ABS relay if accessible.

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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code C1107 is classified as a serious fault. If your check engine light is flashing — not just steady — pull over safely and do not continue driving. A flashing CEL indicates an active misfire or critical failure that can cause catalytic converter damage within minutes or permanent engine harm within miles. Contact a certified mechanic immediately. Do not attempt roadside repairs on high-severity codes unless you are trained to do so.

Safety note: OBD-II codes identify the system or circuit where a fault was detected — they do not always identify the exact failed component. A professional mechanic using live sensor data will diagnose the root cause more accurately than replacing parts based on the code alone.

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How to Clear Code C1107

What happens after you fix the fault

Once the fault is repaired, C1107 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.

The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.

✅ Safe to Clear When

Fault has been diagnosed and repaired
You want to confirm the repair worked
Code appeared after a sensor was cleaned

⚠️ Do Not Clear When

Preparing for an emissions/PUC test
Root cause is still undiagnosed
Check engine light is flashing

Emissions test note: Clearing codes resets OBD readiness monitors. Most vehicles need 50–100 km of mixed driving before monitors complete. Do not clear codes immediately before an emissions or PUC inspection.