How severe is fault code C1110?

Serious — Stop or limit driving

OBD Code C1110: ABS Power Relay Coil Circuit Failure

Q: What does OBD code C1110 mean?

ABS Power Relay Coil Circuit Failure. The ABS system's power relay—which acts like an electrical switch to activate the ABS pump—isn't receiving the proper signal or current from the control module. It's similar to a light switch that won't turn on because the electrical connection is broken.

Q: What are the symptoms of fault code C1110?

ABS warning light illuminated on dashboard, ABS system disabled; brakes lock up during hard braking, No clicking or humming from ABS pump during brake application

Q: How do I fix OBD fault code C1110?

Inspect connector pins for corrosion, bent terminals, or loose connections; clean or reseat connector.. Test relay with multimeter for coil continuity; replace if resistance is outside 60-80 ohm range.. Check for damaged insulation, broken wires, or corroded splices between module and relay; repair or replace damaged sections.

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What This Actually Means

In plain language — no jargon

The ABS system's power relay—which acts like an electrical switch to activate the ABS pump—isn't receiving the proper signal or current from the control module. It's similar to a light switch that won't turn on because the electrical connection is broken.

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Symptoms You May Notice

3 known symptoms for this code

ABS warning light illuminated on dashboard

ABS system disabled; brakes lock up during hard braking

No clicking or humming from ABS pump during brake application

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Embedded Systems Insight

What the ECU/ECM is actually computing

The ABS module monitors the coil circuit of the power relay for proper voltage and resistance when commanded on. It detects open circuits, short-to-ground, or excessive coil resistance that prevents relay activation.

Voltage & Parameter Thresholds

Parameter	Normal Range	Fault Condition
Relay coil voltage	12V when commanded ON	Below 10V or 0V with command active
Coil resistance	60-80 ohms	Infinite (open) or <10 ohms (short)

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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex

1

ABS relay connector and harness

Inspect connector pins for corrosion, bent terminals, or loose connections; clean or reseat connector.

2

ABS power relay

Test relay with multimeter for coil continuity; replace if resistance is outside 60-80 ohm range.

3

ABS module wiring harness

Check for damaged insulation, broken wires, or corroded splices between module and relay; repair or replace damaged sections.