C1107 — ABS Function Enabled Input Circuit Failure #

Note: The code label can vary depending on the vehicle manufacturer.

• ABS Function Enabled Input Circuit Failure (common generic label)
• ABS Function Input Circuit Malfunction (Nissan)
• ABS Function Enable Switch Circuit Fault (Hyundai/Kia)
• ABS Activation Signal Input Circuit Failure (Toyota)

Summary of DTC C1107 #

The C1107 diagnostic trouble code (DTC) signals a problem detected by the Anti-lock Braking System (ABS) control module concerning the circuit responsible for recognizing when the ABS function should be enabled. In most vehicles, this circuit receives input from various sensors or switches indicating conditions under which ABS activation is permitted or required. A failure here means the ABS module cannot reliably determine whether to engage its functionality, which can compromise braking safety features. While this code rarely causes immediate catastrophic brake failure, it may limit the availability of the ABS in slippery or emergency situations. Prompt attention is recommended to restore your vehicle’s full braking performance.

Common Symptoms for Code C1107 #

Drivers and technicians encountering C1107 will often notice changes in braking performance or warning lights on the dashboard. While the brakes themselves may function in a basic capacity, the advanced safety features of ABS may be partially or completely disabled. The most typical symptoms include:

• ABS warning light illuminated on the instrument panel
• Traction control or stability control warning lights (depending on vehicle)
• Loss of anti-lock braking function (wheels may lock up during hard braking)
• Intermittent or persistent chime or error message regarding the brake system
• Possible increase in stopping distance on slippery surfaces
• No noticeable symptoms in mild, dry conditions (but system is compromised)

Most Likely Causes for Code C1107 #

This DTC is typically triggered by electrical issues within the ABS enable input circuit, but the root cause can vary between vehicles. Based on frequency from field reports and OEM technical service bulletins, the most likely causes are:

1. Faulty ABS function enable switch (where equipped)
2. Corroded or damaged wiring/connectors in the ABS input circuit
3. Defective ABS control module (rare, but possible)
4. Short to ground or open circuit in ABS input wiring
5. Water intrusion into ABS harness or module
6. Blown fuses related to the ABS or brake system circuits

Step-by-Step Diagnostic for Code C1107 #

Diagnosing a C1107 requires a systematic approach to avoid chasing false leads. Start with the most accessible checks before considering major component replacement. Here’s a proven diagnostic process:

• 1. Verify the code using a compatible scan tool. Check for related codes (especially in ABS or body control modules).
• 2. Inspect the ABS warning light operation: Does it illuminate and go out at startup, or stay on?
• 3. Visually inspect ABS wiring and connectors, especially near the ABS module and along the routing to the enable switch or sensor (look for corrosion, broken wires, or loose plugs).
• 4. Check fuse integrity for the ABS and brake system circuits using the vehicle’s fuse diagram.
• 5. Test the ABS function enable switch (if present) for correct operation using a multimeter, verifying signal continuity to the ABS module.
• 6. Check circuit continuity between the switch/sensor and the ABS module; look for opens or shorts to ground.
• 7. Clear the code and road test. Monitor live data if possible to see if the input changes as expected under various conditions.
• 8. If all wiring and switch tests pass but the code returns, suspect the ABS control module and consult OEM repair information before replacement.

Possible Repairs for Code C1107 #

Once the root cause is identified, repairs for C1107 are generally straightforward but must be executed with care to ensure the proper restoration of ABS function. Depending on your findings, the following repairs may be required:

• Replace the ABS function enable switch if found faulty
• Repair or replace damaged wiring or connectors in the input circuit
• Clean and secure corroded connectors
• Seal or reroute wiring to prevent future water intrusion
• Replace blown fuses and identify the cause of the blown fuse
• Replace the ABS control module (last resort, after all other avenues are exhausted and per OEM procedures)

Is It Safe to Drive with Code C1107? #

Driving with C1107 is NOT recommended if you rely on ABS for safe braking, especially in poor weather or emergency situations. While basic braking will usually remain operational, the anti-lock functionality—which prevents wheel lockup and loss of steering during panic stops—may be partially or completely unavailable. If the ABS warning light is on, exercise extreme caution and have the system diagnosed and repaired as soon as possible. For dry, gentle driving, you may be able to reach a repair facility, but avoid heavy traffic and slippery roads.

Vehicles Most Commonly Affected by Code C1107 #

C1107 is a fairly common code across a range of vehicles that use electronic ABS modules. While it can occur on many makes and models, it is most frequently reported in:

• Nissan (Altima, Sentra, Rogue, Pathfinder)
• Hyundai/Kia (Sonata, Elantra, Sportage, Sorento)
• Toyota (Camry, Corolla, RAV4)
• Chrysler/Dodge/Jeep (various models with ABS/ESC)
• Mazda (Mazda3, Mazda6, CX series)

It can also appear on select models from Ford, GM, Honda, VW/Audi, and others—always check OEM bulletins for your specific vehicle.

Common Mistakes & Best Practices for Code C1107 #

Technicians and DIYers sometimes make avoidable errors when addressing C1107. Awareness of these pitfalls helps ensure a successful, lasting repair:

• Skipping basic wiring checks and replacing the ABS module prematurely
• Overlooking corroded or loose connectors—a leading cause of intermittent faults
• Failing to check fuses before diving into complex diagnostics
• Not clearing codes after repairs, leaving the warning light on
• Forgetting to road test and verify ABS function after repairs

Quick FAQ for Code C1107 #

Q: Can I just clear the C1107 code and keep driving?
A: Clearing the code without repairing the underlying issue will usually result in the warning light returning. The ABS system may remain disabled, compromising your safety.

Q: Is this an expensive repair?
A: Cost depends on the root cause. Simple wiring or switch repairs are generally affordable, while ABS module replacement can be costly. Accurate diagnosis is key to avoiding unnecessary expenses.