C1115 — ABS Power Relay Output Short Circuit To Battery #

Note: The description of code C1115 may vary depending on the vehicle manufacturer. Always refer to the OEM (Original Equipment Manufacturer) service information for the most accurate definition relevant to your vehicle.

Known variations of the code description:

• ABS Power Relay Output Short to Battery (Nissan, Infiniti, Hyundai, Kia)
• ABS Power Supply Circuit – Short to Battery (Toyota, Lexus)
• Anti-lock Brake System Power Relay Output Circuit High (Ford, Lincoln)

Summary of DTC C1115 #

Diagnostic Trouble Code C1115 indicates that the ABS (Anti-lock Braking System) control module has detected an abnormal condition in the power relay output circuit, specifically a short circuit to the battery voltage. The ABS power relay is an electrical switch that provides power to the ABS system; it is monitored for integrity and correct operation by the module. When the relay output is shorted directly to battery voltage, it can lead to improper ABS function or a complete system shutdown as a safety measure. This fault requires prompt attention to ensure your vehicle’s anti-lock brakes remain fully operational. Left unaddressed, this code may compromise braking safety and affect other related vehicle systems.

Frequent Symptoms for code C1115 #

When code C1115 is active, you may notice several warning signs indicating an issue with your ABS system. Often, these symptoms are apparent both through dashboard alerts and changes in driving feel, especially during braking events.

• ABS warning light illuminated on the instrument cluster
• Traction control warning light may also turn on
• No ABS operation during hard braking (wheels may lock up)
• Loss of traction or stability assist features
• Intermittent or complete disabling of the ABS system
• Potential error messages on the driver information display

Probable Causes for code C1115 (in order of frequency) #

The most common sources of a C1115 code stem from electrical faults and component failures within the ABS power supply circuit. Prioritizing your diagnostic steps based on likelihood helps streamline the repair process and saves time.

1. Failed ABS power relay (contacts stuck, shorted internally)
2. Wiring harness short to battery voltage (damaged, melted, or pinched wires)
3. Faulty ABS control module (internal circuit failure causing false detection)
4. Corroded, loose, or contaminated relay socket or connectors
5. Aftermarket electrical modifications affecting the ABS circuit

Step-by-Step Diagnostics for code C1115 #

Accurately diagnosing a C1115 code involves a systematic approach to pinpoint the exact cause. Here is a proven diagnostic path used by master technicians:

1. Verify the code: Use a professional scan tool to confirm C1115 is current and record any related codes.
2. Visual inspection: Check the ABS power relay, wiring harness, and connectors for signs of damage, corrosion, or aftermarket modifications.
3. Test the ABS power relay: Remove the relay and bench-test it for proper operation. Replace if faulty.
4. Check for short circuits: Using a multimeter, inspect the relay output circuit for continuity to battery voltage (should not exist with ignition off).
5. Inspect wiring harness: Trace the harness from the relay to the ABS module, looking for pinched, melted, or exposed wires.
6. Test the ABS control module: If no wiring or relay fault is found, follow OEM testing procedures for the control module. Substitute a known-good module if possible.
7. Clear the code and perform a road test to confirm the repair.

Possible Repairs for code C1115 #

The right repair depends on the root cause found during diagnostics. Addressing the source of the short circuit is crucial for restoring full ABS function.

• Replace the ABS power relay if it fails bench testing or shows internal shorts.
• Repair or replace damaged wiring between the relay, battery, and ABS module.
• Clean or repair corroded relay sockets or connectors in the ABS power circuit.
• Correct any aftermarket wiring issues introducing shorts to the system.
• Replace the ABS control module if diagnosed as faulty by OEM standards.

Can You Drive with code C1115? #

Driving with code C1115 is not recommended. While the vehicle may operate normally under gentle conditions, your ABS and possibly traction or stability control systems will be disabled or unreliable. In emergency braking scenarios, wheel lockup is likely, increasing the risk of losing control. For your safety and that of others, repair the fault before resuming regular driving.

Vehicles Most Commonly Affected by code C1115 #

While C1115 can occur in many vehicles equipped with ABS, it is most frequently reported in certain makes and models, often due to specific relay or harness vulnerabilities.

• Nissan (Altima, Maxima, Rogue, Murano)
• Infiniti (G35, QX60, FX35)
• Hyundai (Sonata, Elantra, Santa Fe)
• Kia (Sorento, Optima, Forte)
• Toyota (Camry, Corolla, Tacoma)
• Ford (F-150, Escape, Explorer)

Frequent Mistakes & Best Practices for code C1115 #

Repairing ABS faults can be tricky. Avoid these common pitfalls to ensure an effective and lasting repair:

• Replacing the ABS module too soon: Always test the relay and wiring first—these are more common failure points.
• Overlooking corroded connectors: Clean and inspect all terminals for hidden oxidation or moisture.
• Neglecting to check for aftermarket wiring or alarm system impacts on the ABS circuit.
• Not performing a full system scan: Look for related codes that could indicate broader electrical issues.
• Skipping the road test after repairs: Confirm ABS operation and code clearance before returning the vehicle.

Express FAQ for code C1115 #

Q: Will a blown ABS fuse cause code C1115?
A: Not directly. C1115 specifically indicates a short to battery in the relay output circuit, not a loss of power from a blown fuse. However, a related electrical fault could cause both issues.

Q: Can I reset C1115 by disconnecting the battery?
A: Disconnecting the battery may temporarily clear the code, but it will return once the ABS module detects the same short circuit condition. Always address the root cause to prevent repeated faults.