C1149 – OBD-II DTC

OBD-II DTC C1149 – Hydraulic Fluid Pressure/ Flow Circuit Failure

DTC C1149 meaning

DTC C1149 refers to a fault in the hydraulic fluid pressure or flow circuit within a vehicle’s braking system. This code indicates that the system has detected an issue with the hydraulic pressure, which is crucial for the proper functioning of the brakes. The hydraulic system is responsible for transferring force from the brake pedal to the brake components, and any failure in this circuit can lead to compromised braking performance.

DTC C1149 symptoms

Common symptoms associated with DTC C1149 may include:

• Illuminated warning lights on the dashboard, such as the ABS or brake warning light.
• Reduced braking efficiency or a spongy brake pedal feel.
• Unusual noises when applying the brakes, such as grinding or squeaking.
• Inconsistent brake response or a longer stopping distance.
• Possible activation of the anti-lock braking system (ABS) malfunction.

DTC C1149 causes

Several factors can lead to the triggering of DTC C1149, including:

• Low hydraulic fluid levels due to leaks or evaporation.
• Faulty hydraulic pump or motor.
• Damaged or corroded wiring in the hydraulic pressure circuit.
• Malfunctioning pressure sensors or switches.
• Contaminated hydraulic fluid affecting system performance.

DTC C1149 seriousness

DTC C1149 is considered a serious issue as it directly impacts the vehicle’s braking system. If left unaddressed, it can lead to:

• Increased risk of brake failure, which can result in accidents.
• Potential damage to other braking components.
• Higher repair costs due to extensive damage if the issue is not resolved promptly.

How to diagnose DTC C1149

To diagnose DTC C1149, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the C1149 code.
2. Check for any additional DTCs that may provide more context.
3. Inspect the hydraulic fluid level and condition, looking for leaks or contamination.
4. Examine the wiring and connectors in the hydraulic pressure circuit for damage or corrosion.
5. Test the hydraulic pump and pressure sensors for proper operation.
6. Perform a visual inspection of the brake system components for wear or damage.

How to fix DTC C1149 step-by-step instructions

To fix DTC C1149, follow these steps:

1. Address any hydraulic fluid leaks by replacing damaged hoses or seals.
2. Top off or replace the hydraulic fluid if levels are low or if contamination is present.
3. Repair or replace any damaged wiring or connectors in the hydraulic circuit.
4. Replace faulty hydraulic pumps or pressure sensors as needed.
5. Bleed the brake system to remove any air that may have entered during repairs.
6. Clear the DTC using an OBD-II scanner and test drive the vehicle to ensure the issue is resolved.

How to erase DTC C1149

To erase DTC C1149, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the DTC menu on the scanner and select the option to clear or erase codes.
4. Confirm the action and wait for the scanner to complete the process.
5. Disconnect the scanner and start the vehicle to ensure the code does not reappear.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.