OBD-II code · Chassis
C0644 Brake Pressure Sensor K Range/Performance
Brake pressure sensor K reading implausible.
Is it safe to drive with C0644?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySensor reading drifted
- Less likelySensor element aged beyond calibration window
- Less likelySensor mounting loose - signal damping
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Brake Pressure Sensor K
Related codes
- C053DBrake Pressure Sensor A Range/Performance
- C0541Brake Pressure Sensor B Range/Performance
- C05A2Brake Pressure Sensor E Range/Performance
- C0638Brake Pressure Sensor G Range/Performance
- C063CBrake Pressure Sensor H Range/Performance
- C0640Brake Pressure Sensor J Range/Performance
- C0648Brake Pressure Sensor L Range/Performance
- C064CBrake Pressure Sensor M Range/Performance
- C0650Brake Pressure Sensor N Range/Performance
- C0641Brake Pressure Sensor K Circuit/Open
- C0642Brake Pressure Sensor K Circuit High
- C0643Brake Pressure Sensor K Circuit Low
- C0645Brake Pressure Sensor L Circuit/Open
- C0646Brake Pressure Sensor L Circuit High
- C0647Brake Pressure Sensor L Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.