What Does C1181 Mean?
The park brake valve solenoid #1 sense input circuit is shorted to ground. The ABS module is detecting a low-resistance path to ground on the solenoid feedback signal wire, preventing proper monitoring of the parking brake hydraulic solenoid. This will disable the electronic parking brake and may also affect ABS operation. The parking brake and ABS warning lights will be illuminated.
Common Causes
35%
Wiring harness shorted to ground near the solenoid or ABS hydraulic unit, often from chafing on metal brackets
30%
Solenoid coil internally shorted to the solenoid body (ground)
20%
Brake fluid contamination in the solenoid connector causing a conductive path
15%
Corroded connector creating an unintended ground path through moisture
Diagnostic Steps
1
Disconnect the solenoid #1 connector and clear the code. If the code does not return (or changes to an open circuit code C1180), the solenoid itself is shorted — replace it.
2
With the solenoid disconnected, measure resistance from each solenoid connector pin to the solenoid body (ground). Both should read OL (infinite). A low reading indicates the coil is shorted to the case.
3
With the solenoid still disconnected, measure resistance from each wire in the harness connector to chassis ground. Both should be OL. A low reading identifies a harness short — trace along the wire routing to find the damage.
4
Inspect the area around the ABS hydraulic unit for brake fluid leaks that may have contaminated the solenoid connector. Brake fluid is conductive when contaminated and can create ground paths.
5
Check the harness routing near the solenoid for contact with sharp edges, mounting brackets, or exhaust components that could wear through the insulation.
Estimated Repair Cost
$100 - $700
Parts + labor, varies by vehicle and location
The park brake valve solenoid #1 sense input circuit is shorted to ground. The ABS module is detecting a low-resistance path to ground on the solenoid feedback signal wire, preventing proper monitoring of the parking brake hydraulic solenoid. This will disable the electronic parking brake and may al...
The most common cause of C1181 (Park Brake Valve Solenoid #1 Sense Input Circuit Short to Gound) is: Wiring harness shorted to ground near the solenoid or ABS hydraulic unit, often from chafing on metal brackets
Typical repair costs for C1181 range from $100 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The electronic parking brake is non-functional. Use wheel chocks when parking. ABS may also be disabled. The vehicle can be driven carefully to a repair facility, but do not park on inclines without mechanical wheel restraints.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1181 to identify the root cause.
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Quick Info
Category
Chassis
System
ABS / Electronic Parking Brake
Difficulty
Type
Manufacturer
Recommended Tools
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