ABS Power Relay Output Short to Battery
The C1115 code indicates a short to battery voltage in the ABS power relay output circuit. The ABS control module detects unexpected battery voltage on the relay control line when it should be off or at ground potential. This can cause the ABS system to malfunction or damage electrical components, as the power relay supplies voltage to the solenoids and pump motor.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty ABS power relay stuck closed
- Short to battery voltage in the relay circuit wiring
- Defective ABS control module (actuator unit)
- Corroded or damaged electrical connections at the ABS module connector
- Blown or incorrectly bridged ABS system fuse
3. Symptoms You Will Notice
- ABS warning light illuminated on the dashboard
- ABS system inoperative or erratic operation
4. Step-by-Step Diagnosis
Scan for additional ABS codes and note freeze frame data.
Visually inspect the ABS power relay and its wiring for damage or corrosion.
Test the relay for proper operation (coil resistance and switching).
Check for battery voltage on the relay control circuit when the relay should be off.
Inspect the ABS module connector for bent pins, corrosion, or damaged wires.
If all else is normal, suspect a faulty ABS control module.
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive with this code. The ABS system may not function properly, increasing the risk of wheel lockup during hard braking. Additionally, a short to battery could cause further electrical damage or a fire hazard.
How much does it cost to fix?▼
Repair costs typically range from $150 to $800, depending on the cause. A relay replacement is on the lower end, while replacing the ABS module can be more expensive.