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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Embedded Systems Insight

What the ECU/ECM is actually computing

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.