ABS Power Relay Circuit Failure
The C1185 code indicates a fault in the output circuit of the ABS power relay. This relay supplies electrical power to the ABS control module when the system is activated. The code sets when the control module detects an abnormal voltage or continuity in the relay output circuit, preventing proper power delivery to the anti-lock braking system. This diagnostic is specific to Ford Motor Company and its associated brands, where the ABS module monitors the relay status as part of its self-check sequence.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty ABS power relay with burned contacts
- Damaged wiring or loose connection in the ABS relay circuit
- Blown or high-resistance ABS circuit fuse
- Internal failure in the ABS control module relay control circuit
- Poor ground connection in the ABS power circuit
- Corrosion in the ABS relay harness connectors
3. Symptoms You Will Notice
- ABS warning light illuminated on the dashboard
- ABS system inoperative or disabled
4. Step-by-Step Diagnosis
Check the ABS fuse and replace if blown or high resistance
Inspect the ABS relay for signs of damage or corrosion and test relay operation
Examine wiring and connectors in the ABS relay circuit for damage, looseness, or corrosion
Test for proper voltage and ground at the ABS module relay control circuit
If all else is okay, suspect a faulty ABS control module
5. Frequently Asked Questions
Is it safe to drive?▼
Driving with this code is not recommended as the ABS system may be disabled, increasing the risk of wheel lockup during hard braking, especially on slippery surfaces.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on whether the issue is a simple relay or fuse replacement versus more complex wiring repairs or module replacement.