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OBD Code C1187

Brake Fluid Level Sensor Input Open Circuit

CodeC1187
DescriptionBrake Fluid Level Sensor Input Open Circuit
SystemChassis

What Does C1187 Mean?

Brake Fluid Level Sensor Input Open Circuit. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the chassis.

Code Breakdown

C = Chassis code

1 = Manufacturer-specific

How to Fix C1187

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Check brake fluid level and condition.
  2. Inspect brake pads, rotors, and calipers for wear or damage.
  3. Look for leaks in the brake hydraulic system.
  4. Check the brake light switch and wiring.
  5. Inspect the brake booster vacuum hose.
  6. Clear codes and test braking performance.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is C1187 serious?

Yes — C1187 is considered a critical-severity code. You should have it diagnosed and repaired as soon as possible. Driving with this code active may cause further damage to your vehicle or pose a safety risk.

Can I clear C1187 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return — usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix C1187?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool — not just reading the code — is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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