OBD-II code · Chassis
C0201 Brake Fluid Level Switch Circuit
The ABS or brake control module has detected a fault in the brake fluid level switch circuit. A low fluid level indicates a potential leak in the hydraulic system and disables ABS while a separate brake warning lamp is illuminated.
Is it safe to drive with C0201?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyBrake fluid level low (worn pads or hydraulic leak)
- PossibleFloat switch in reservoir failed
- Less likelyWiring or connector fault
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Brake Fluid Level Switch, Brake Fluid Reservoir, ABS Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.