What Does C1149 Mean?
This code indicates the ABS or brake control module has detected a failure in the hydraulic fluid pressure or flow circuit. The module monitors the ABS pump motor and hydraulic accumulator/pressure system and has determined that adequate pressure or flow cannot be maintained. This affects the module's ability to modulate brake pressure during ABS activation.
Safety Warning
ABS cannot modulate brake pressure, so anti-lock braking is unavailable. Conventional braking still works but wheel lockup is possible on slippery surfaces. Repair promptly.
Common Causes
30%
Failed ABS pump motor unable to generate adequate hydraulic pressure
25%
Leaking or stuck ABS solenoid valve preventing proper pressure buildup or release in the hydraulic modulator
20%
Low brake fluid level reducing available fluid volume for the ABS system to modulate
15%
Damaged ABS pump motor relay or wiring preventing the motor from running when commanded
10%
Internal hydraulic control unit blockage or contamination from degraded brake fluid
Diagnostic Steps
1
Step 1: Check brake fluid level and condition. Dark, contaminated fluid suggests internal system contamination that may be blocking hydraulic passages.
2
Step 2: Listen for the ABS pump motor running during an ABS self-test (typically heard at startup or low speed). No pump noise when commanded indicates motor or relay failure.
3
Step 3: Test the ABS pump motor relay by swapping with an identical relay or applying 12V directly. Verify the pump motor runs when directly powered (test at the motor connector).
4
Step 4: Measure pump motor current draw (typical 5-15 amps). Excessively high draw indicates a seized motor; no draw indicates an open motor winding.
5
Step 5: If the pump runs normally, the issue is likely internal to the hydraulic modulator. This typically requires ABS hydraulic unit replacement. Clear codes and verify after repair.
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
This code indicates the ABS or brake control module has detected a failure in the hydraulic fluid pressure or flow circuit. The module monitors the ABS pump motor and hydraulic accumulator/pressure system and has determined that adequate pressure or flow cannot be maintained. This affects the module...
The most common cause of C1149 (Hydraulic Fluid Pressure/ Flow Circuit Failure) is: Failed ABS pump motor unable to generate adequate hydraulic pressure
Typical repair costs for C1149 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
ABS cannot modulate brake pressure, so anti-lock braking is unavailable. Conventional braking still works but wheel lockup is possible on slippery surfaces. Repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1149 to identify the root cause.
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Quick Info
Category
Chassis
System
ABS Hydraulic System
Difficulty
Type
Manufacturer
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