C1103 OBD-II Trouble Code: ABS Hydraulic Brake Switch Circuit Failure

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE C1103 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the C1103 code

C1103 is a diagnostic trouble code (DTC) for "ABS Hydraulic Brake Switch Circuit Failure". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE C1103 DIAGNOSTIC Get a fair and transparent estimate upfront

C1103 code definition

A C1103 trouble code indicates that the vehicle's Engine Control Unit (ECU) has detected an unspecified failure in the hydraulic brake switch circuit of the Antilock Braking System (ABS).

What the C1103 code means

The ABS helps to minimize the risk of wheel slippage and loss of steering control. If the hydraulic brake switch circuit has experienced a failure, this may result in the failure or severe limitation of the ABS system. Although regular braking should function normally, this will have a significant impact on the vehicle's sense of handling.

What causes the C1103 code?

If your vehicle is suffering from a C1103 code, a faulty switch, sensor or ABS control unit may be to blame. issues with wiring are a likely cause. Corroded, damaged, faulty and otherwise poorly installed circuitry may be to blame for this circuit failure. In some rare cases, the ECU itself may be faulty, mistakenly reporting the trouble code as a result. Due to the rareness of this cause, it should only be considered once all other plausible causes have been exhausted.

What are the symptoms of the C1103 code?

A C1103 trouble code may result in a malfunctioning or disabled ABS brake system. Regular braking should function properly, unless more brake-related codes have been stored. In addition to the practical concerns, the C1103 code will be accompanied by an illuminated check engine light on the vehicle's dashboard, as well as a stored trouble code in the ECU that can be read using an OBD-II scanner. These symptoms are present in a purely diagnostic context, and may be disregarded once the specific issue has been identified.

How does a mechanic diagnose the C1103 code?

A mechanic may first diagnose the C1103 code by reading the ECU using an OBD-II code reader. The ABS control unit, sensors and switch itself should be analyzed for telling signs of faultiness. Any electrical wiring and connectors should looked over for signs of disconnection, corrosion improper wiring/installation, damage and faultiness. Using a tool such as an Autohex scanner can make it easier to locate the source of the circuit failure.

Common mistakes when diagnosing the C1103 code

Chassis (or C-class) trouble codes may describe different issues depending on the make and model of vehicle in question. In Mercedes vehicles, for example, a C1103 trouble code refers to a circuit issue with the car's right-rear axle. Your OBD-II scanner may specify the code description for you. If you're not sure if you're interpreting the code correctly, contact the vehicle's manufacturer or a YourMechanic representative for help.

How serious is the C1103 code?

A malfunctioning antilock braking system increases the margin of danger driving the vehicle. Your vehicle will handle differently than usual without its proper ABS traction. Although the vehicle may still technically be drivable without the Antilock Braking System, it significantly increases the risk of accidents. A C1103 trouble code is considerably more serious if the vehicle is typically driven on less-than-optimal driving conditions and routes.

What repairs can fix the C1103 code?

If a switch, sensor or ABS control unit have been found out as faulty, they'll need to be replaced. Any electrical wiring and connectors that have been identified as broken, damaged or faulty should be replaced, repaired or rewired accordingly. In the rare event that the ECU has been identified as faulty, it will need to be reprogrammed or replaced altogether. Once you've made any necessary repairs to fix the ABS hydraulic brake switch circuit, restart the vehicle. If the C1103 hasn't been properly solved yet, this will give the trouble code a chance to recur. In the event that the issue hasn't been solved, inspect the circuit again for potential causes you may have overlooked the first time around.

Additional comments for consideration regarding the C1103 code

Model-specific C1103 code descriptions include a VSS circuit failure in the right-rear axle (for Mercedes vehicles), and a front right sensor ABS sensor issue for many Nissan models.

Need help with a C1103 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

C1103
trouble codes
Check Engine Light

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE C1103 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

4,743

Rating Summary
4,361
185
47
28
122
4,361
185
47
28
122

Oreste

12 years of experience
108 reviews
Oreste
12 years of experience
Nissan Altima - Check Engine Light is on - Hialeah, Florida
Showed up quick, and went straight to inspecting a brake light on the dash issue. He found the issue, fixed it, and showed me exactly what was wrong. Thank you!

Daniel

9 years of experience
58 reviews
Daniel
9 years of experience
Honda Fit - Check Engine Light is on - Chicago, Illinois
Told me everything I needed to know and switch out after the inspection. So, I scheduled another service the next day for all the fixes, or fluid maintenance.

Patrick

31 years of experience
1032 reviews
Patrick
31 years of experience
Hyundai Santa Fe - Check Engine Light is on - Austin, Texas
Even after working on my car, he took the time to explain what he did, the parts, and any next steps. Very knowledgeable!

Joe

12 years of experience
22 reviews
Joe
12 years of experience
Toyota 4Runner - Check Engine Light is on - Sacramento, California
Joe was very thorough in his inspections, and his knowledge & experience was clear in his explanations of what was wrong with my car. I really appreciated his recommendations, and the fact that he worked so efficiently that it cut down on time... I would definitely book with him again.

More related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost pressure sensor B input circuit range or performance...
How to Buy Fuel Treatments
Adding Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine, and increase gas mileage. When trying to decide on which additive...
How to Transfer a Car Title in Idaho
In In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs to be transferred into the new owner’s name. The state of Idaho has...

Related questions

P2006 code is present in the computer.

Hi there. With having the code P2006 present, check the intake wiring to the runner control and see if there is a good connection. Also, the runners in the intake could be clogged and needs cleaned out. A leaking or...

Car shaking and stalling while driving.

Hello, the place to start would be to have your check engine light diagnosed. I would recommend getting the aid of a mechanic to come out and connect a scanner to your vehicle and see what codes are present and...

VSC and Traction control lights on after wheel alignment. Unable to reset/recalibrate

A faulted sensor like the steering angle sensor can cause these systems to malfunction. A steering angle reset is required with an alignment on these vehicles and involves a procedure that includes disconnecting the battery. If you'd like a fresh...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com