ABS Power Relay Circuit Fault C1110
The C1110 code indicates a fault in the ABS power relay circuit. This relay supplies electrical power to the ABS hydraulic module. When the ABS control module detects an open circuit, short circuit, or out-of-range resistance in the relay coil, it sets this code. The relay is essential for activating the solenoid valves in the hydraulic unit, so a failure can disable the ABS system.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty or damaged ABS power relay
- Corroded or damaged wiring and connections in the relay circuit
- Short to ground or battery in the relay coil circuit
- Open circuit in the ABS power relay wiring
- Internal failure of the ABS control module or ECU
- Blown or incorrect amperage fuse in the ABS circuit
3. Symptoms You Will Notice
- ABS warning light illuminated on the dashboard
- ABS system inoperative; wheels may lock during hard braking
4. Step-by-Step Diagnosis
Check the ABS fuse and replace if blown or incorrect amperage
Inspect the ABS power relay for signs of damage or corrosion; test relay coil resistance per specifications
Visually inspect wiring and connectors for corrosion, breaks, or shorts
Test for voltage at the relay coil and switch contacts with a multimeter
If all else is good, suspect a faulty ABS control module and perform further diagnostics
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive with this code active. The ABS system may be disabled, increasing the risk of wheel lockup and loss of control during hard braking. Have the vehicle repaired immediately.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on the cause. A relay replacement is inexpensive ($20-$50), but if the ABS module needs replacement, costs can exceed $800.