Fault code C1110 – a step-by-step guide to diagnosing and fixing it

The meaning of error code C1110 – ABS Power Relay Coil Circuit Failure

C1110: Causes, signs and repairs

Error code C1110 is displayed and the check engine light is on - what does this mean?

The DTC C1110 is recognized by the OBD system when there is a problem with the ABS control unit or the communication between the brake system components. This fault code typically refers to a malfunction in the anti-lock braking system and can vary slightly depending on the vehicle manufacturer.

What can cause this error code?

Defective ABS control unit
Damaged cable to the ABS sensor
Loose or corroded plug connections
Defective wheel speed sensor
Faulty wiring in the ABS system
Defective ABS pump or hydraulic unit
Fault in the power supply to the ABS system
Mechanical damage to the sensor ring

What symptoms occur in parallel with fault code C1110?

ABS warning light: The ABS indicator light is permanently illuminated on the dashboard
Braking problems: Extended braking distances or locking wheels when braking
ESP malfunction: The electronic stability program is not working properly
Starting problems: In rare cases, starting problems may occur
Unusual noises: Clicking or buzzing noises from the ABS system
Reduced driving stability: Especially in wet or slippery road conditions

How can I fix the problem with error code C1110?

Repairing trouble code C1110 requires a systematic approach to identify the exact cause.
Replace the ABS control unit: If the control unit is defective, carry out a complete replacement and then have it programmed
Check and replace wheel speed sensors: Test all four sensors for function and replace defective components
Repair wiring: Locate damaged cables, repair professionally or replace complete wiring harnesses
Clean plug connections: Dismantle all ABS-relevant plugs, clean and treat with contact spray
Replace ABS hydraulic unit: If the pump or valve block is defective, replace the entire unit
Replace sensor ring: Replace damaged or dirty sensor rings on the wheels
Check power supply: Check and replace fuses, relays and earth points of the ABS system

FAQ - Frequently asked questions about DTC C1110

Can I continue driving with error code C1110?

It is possible to continue driving with code C1110, but it is not recommended. The ABS system is not working properly, which significantly impairs driving safety. The wheels may lock during emergency braking.

How much does it cost to repair error code C1110?

The repair costs for DTC C1110 vary between €150 and €1,500 depending on the cause. A defective sensor costs around €150-300, while a new ABS control unit can cost €800-1,500.

How is fault code C1110 diagnosed?

Diagnosis is carried out using an EOBD diagnostic device, which reads out the fault code. The ABS sensors, wiring and control unit are then systematically checked.

Can I delete the code C1110 myself?

Fault code C1110 can be deleted with an OBD scanner, but will return if the root cause has not been rectified. A professional repair is required.

What tools do I need to repair C1110?

To rectify DTC C1110, you will need a multimeter, OBD diagnostic device, basic tools and possibly special ABS diagnostic software from the vehicle manufacturer.

Does error code C1110 occur more frequently in certain weather conditions?

Code C1110 can occur more frequently in damp conditions if moisture penetrates the plug connections or sensors are affected by dirt and corrosion.

Vehicles in which fault code C1110 occurs most frequently

Error code C1110 is an ABS-specific trouble code and can occur in various vehicles with electronic brake systems, but is most common in the following vehicles:

BMW: 3 Series, 5 Series, X3, X5 (2005-2015)
Mercedes-Benz: C-Class, E-Class, ML-Class (2004-2014)
Audi: A4, A6, Q5, Q7 (2006-2016)
Volkswagen: Golf, Passat, Touran, Tiguan (2005-2014)
Ford: Focus, Mondeo, Kuga (2008-2016)
Opel: Astra, Insignia, Zafira (2007-2015)
Toyota: Avensis, RAV4, Prius (2006-2014)
Honda: Civic, Accord, CR-V (2007-2015)

If code C1110 occurs in your vehicle, you should have the problem diagnosed promptly by a specialist workshop. The ABS system is a safety-relevant system whose proper functioning is crucial for driving safety. An early repair can prevent more expensive consequential damage and ensure your safety on the road.

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