What Does C1185 Mean?
The ABS power relay output circuit has a general failure. The relay that supplies main power to the ABS pump motor and/or control module is not functioning correctly. Without proper relay output, the ABS hydraulic pump cannot operate, and the system cannot modulate brake pressure. ABS, traction control, and stability control will be disabled.
Safety Warning
ABS is completely non-functional because the hydraulic pump has no power. Conventional brakes still work, but all electronic braking aids are disabled. Increased stopping distances on slippery surfaces and no traction/stability control. Have repaired promptly.
Common Causes
35%
Failed ABS power relay (worn contacts, burned coil, or stuck open)
25%
Wiring fault between the relay and the ABS hydraulic unit or module
20%
Blown ABS main fuse feeding the relay circuit
15%
ABS module unable to command the relay due to internal driver fault
5%
Poor battery or chassis ground connection reducing circuit voltage
Diagnostic Steps
1
Locate the ABS power relay in the fuse/relay box. Swap it with an identical relay from a non-critical circuit (e.g., horn relay if same part number). Clear codes and test. If the code clears, replace the ABS relay.
2
Check the ABS main fuse(s). A blown fuse may indicate a downstream short — inspect the ABS pump motor wiring before replacing the fuse.
3
With the relay removed, test the relay coil and contacts on the bench. Apply 12V to pins 85/86 and verify a click and continuity between pins 30 and 87.
4
Measure voltage at the relay socket: pin 30 should have constant battery voltage (12V+), and the control module should provide ground on pin 85 or 86 when commanding ABS operation. No voltage on pin 30 indicates a supply-side fault.
5
Measure voltage at the ABS hydraulic unit power input with the relay installed and commanded on. Should be within 0.5V of battery voltage. A significant voltage drop indicates high resistance in the relay or wiring.
Estimated Repair Cost
$30 - $500
Parts + labor, varies by vehicle and location
The ABS power relay output circuit has a general failure. The relay that supplies main power to the ABS pump motor and/or control module is not functioning correctly. Without proper relay output, the ABS hydraulic pump cannot operate, and the system cannot modulate brake pressure. ABS, traction cont...
The most common cause of C1185 (ABS Power Relay Output Circuit Failure) is: Failed ABS power relay (worn contacts, burned coil, or stuck open)
Typical repair costs for C1185 range from $30 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
ABS is completely non-functional because the hydraulic pump has no power. Conventional brakes still work, but all electronic braking aids are disabled. Increased stopping distances on slippery surfaces and no traction/stability control. Have repaired promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1185 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Chassis
System
ABS / Traction Control
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
