Applicable Systems
OBD-II
Symptoms
The brake warning light illuminates. The brake pedal may feel spongy or the braking force distribution may be uneven. DTC C0149 is stored in the chassis control module.
Possible Causes
- Faulty brake pressure sensor
- Brake fluid contamination
- Brake line leak or restriction
- ABS hydraulic unit internal fault
Troubleshooting Steps
- Step 1: Connect a diagnostic scanner and read chassis DTCs to confirm C0149
DTC C0149 is present with freeze frame data showing conditions when it set - Step 2: Inspect wiring and connectors in the affected circuit for corrosion, damage, or loose pins
Wiring intact, connectors clean and properly seated - Step 3: Perform component-level testing per manufacturer diagnostic procedure for the specific subsystem
Component values within specification or component confirmed faulty - Step 4: Clear the DTC and verify it does not return after a road test
DTC does not return; system warning light stays off
How to Reset
Clear the DTC after repair using a diagnostic scanner. The code will clear automatically if the fault is no longer detected after 3 consecutive drive cycles.
Frequently Asked Questions
- Q: What does code C0149 mean?
This is a chassis-related diagnostic trouble code indicating an issue with the brake pressure system. The specific subsystem should be diagnosed using the manufacturer's diagnostic procedure.
- Q: Can I drive with code C0149?
Limited driving is possible, but the affected chassis system may not function correctly. Have the vehicle diagnosed promptly to ensure safety systems like ABS and stability control are operational.
Source: SAE J2012 Standard OBD-II Diagnostic Trouble Codes
Category: OBD-II