C1110 — ABS Power Relay Coil Circuit Failure #

Note: The wording of this code may vary depending on the vehicle manufacturer (OEM). Always verify with your repair manual or scan tool for exact terminology on your specific model.

• ABS Power Relay Coil Circuit Malfunction (Nissan)
• ABS Power Relay Circuit Failure (Infiniti)
• ABS Relay Coil Circuit Error (Kia/Hyundai)
• ABS Pump Motor Relay Circuit Malfunction (Ford)

Summary of the C1110 Code #

The C1110 code indicates a problem detected by the vehicle’s Anti-lock Braking System (ABS) control module with the circuitry of the power relay coil. This relay is an electrically operated switch responsible for supplying power to the ABS pump or module when required. When the ABS control unit senses that the relay coil circuit is open, shorted, or otherwise not functioning as intended, it stores the C1110 code and may disable ABS operation as a precaution.

This failure can compromise the ABS system’s ability to prevent wheel lockup during hard braking. The code is most common on vehicles from Nissan, Infiniti, Kia, Hyundai, and Ford, but can be found across many brands. Prompt diagnosis is essential to restore full braking safety features.

Common Symptoms for DTC C1110 #

When the C1110 code is present, you’ll often notice a change in braking behavior or warning indicators. Some symptoms are subtle, while others are more obvious. Recognizing these signs early can prevent more significant issues down the road.

• ABS warning light illuminated on the dashboard
• Possible brake warning light or traction control light
• ABS system disabled (brakes function normally, but without anti-lock protection)
• Loss of traction and stability assistance
• Intermittent or total loss of ABS pump operation

Likely Causes of C1110 (by Frequency) #

Several factors can trigger the C1110 code, but some are more common than others. Pinpointing the most probable cause saves time and money during the repair process. Here’s what most technicians find, in order of likelihood:

1. Faulty ABS power relay: The relay itself may have internal electrical faults or worn contacts.
2. Wiring harness issues: Damaged, corroded, or loose wires/connectors in the relay’s circuit.
3. Blown fuse: An open fuse in the ABS power circuit can prevent relay operation.
4. Failed ABS control module: The module may not be sending the correct signal to the relay coil.
5. Corroded or poor ground connections: Especially in humid or older vehicles.

Step-by-Step Diagnostic Guide for Code C1110 #

Diagnosing C1110 requires a systematic approach to avoid replacing parts unnecessarily. Use a digital multimeter and, if available, a scan tool with live data and active test functions.

• Verify the code and clear it. See if it returns immediately upon restart.
• Check the ABS fuse(s) for continuity and replace if necessary.
• Locate the ABS power relay (refer to your repair manual or fuse box diagram).
• Test the relay by swapping it with a similar known-good relay if possible.
• With the relay removed, check for battery voltage at the relay socket (power supply side) with ignition ON.
• Test for ground at the relay control side. Clean or repair any corroded or loose grounds.
• Check continuity of the relay coil itself using a multimeter.
• Inspect wiring and connectors between the relay, ABS module, and fuse box for damage or corrosion.
• If all external components test good, suspect a fault within the ABS control module.

Possible Repairs for C1110 #

Once the root cause is identified, repairs can be straightforward or may require more in-depth work. Always recheck system operation and clear codes after repairs.

• Replace the faulty ABS power relay with an OEM-specified part.
• Repair or replace damaged wiring or connectors in the relay circuit.
• Replace blown ABS fuse(s) and investigate underlying reasons for fuse failure.
• Clean and secure ground points related to the ABS system.
• If necessary, replace the ABS control module and perform any required system programming.

Is It Safe to Drive with Code C1110? #

Limited — While your basic brakes will still function normally, the anti-lock feature is disabled when this code is present. This means you are at an increased risk of wheel lockup during hard or emergency stops, especially on wet or slippery roads. It’s recommended to address the issue as soon as possible and drive cautiously if you must use the vehicle before repairs.

Vehicles Most Commonly Affected by C1110 #

While C1110 can appear on various makes, some models have a higher rate of occurrence due to relay or wiring design. If you own one of these vehicles, pay special attention to ABS warning lights and address them promptly.

• Nissan Altima, Rogue, Murano, Maxima
• Infiniti G35, FX35, QX60
• Hyundai Santa Fe, Sonata
• Kia Sorento, Optima
• Ford Escape, Focus (certain years)

Common Mistakes & Best Practices with C1110 #

Misdiagnosis is a risk, especially if you skip steps or rely solely on code readers without proper testing. Following best practices saves time and prevents unnecessary expenses.

• Don’t just clear the code and hope for the best—the root cause usually remains.
• Avoid replacing the ABS module before testing relays and wiring—modules are expensive and less commonly at fault.
• Always check fuse ratings—installing the wrong amperage can mask deeper issues or lead to future failures.
• Use dielectric grease on connectors after repairs, especially in humid climates, to prevent corrosion.
• Document your findings for future reference or warranty claims.

Quick FAQ — C1110 #

Q: Does C1110 mean my brakes are completely unsafe?
A: No. Your basic braking function remains, but the anti-lock and possibly traction control systems are disabled. Stopping distances may increase under emergency braking, especially on slippery surfaces.

Q: Can I fix C1110 myself?
A: If you have basic electrical diagnostic tools and experience, you can check fuses, relays, and visible wiring. For deeper issues or ABS module concerns, professional diagnosis is recommended.

If you have further questions or your symptoms don’t match the above, consult a certified technician or your dealership for model-specific guidance.