OBD-II code · Chassis
C004D Brake System Pressure Slow Response
Brake system pressure response slower than expected.
Is it safe to drive with C004D?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyPump weak or hydraulic restriction
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–6 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Hcu, Brake Pump
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.