OBD-II code · Chassis
C0638 Brake Pressure Sensor G Range/Performance
Brake pressure sensor G reading implausible.
Is it safe to drive with C0638?
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 G
Related codes
- C053DBrake Pressure Sensor A Range/Performance
- C0541Brake Pressure Sensor B Range/Performance
- C05A2Brake Pressure Sensor E Range/Performance
- C063CBrake Pressure Sensor H Range/Performance
- C0640Brake Pressure Sensor J Range/Performance
- C0644Brake Pressure Sensor K Range/Performance
- C0648Brake Pressure Sensor L Range/Performance
- C064CBrake Pressure Sensor M Range/Performance
- C0650Brake Pressure Sensor N Range/Performance
- C0635Brake Pressure Sensor G Circuit/Open
- C0636Brake Pressure Sensor G Circuit High
- C0637Brake Pressure Sensor G Circuit Low
- C0639Brake Pressure Sensor H Circuit/Open
- C063ABrake Pressure Sensor H Circuit High
- C063BBrake Pressure Sensor H Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.