C0578 code meaning
Brake Pressure Sensor D Circuit Range/Performance
Chassis system Generic code C05xx codes Check engine light
What C0578 means
For sensor D the range/performance check targets a signal that is electrically fine but implausible. In GM's 2016–2019 hybrid brake modules, where D measures left rear brake pressure, the zero offset is learned while the car is being driven above about 4.5 mph with the brake released and the hydraulic pump idle; an offset beyond ±1,500 kPa sets C0578 at once, Type A with MIL. To prove the repair GM asks for driving at roughly 37 mph for at least 5 s. Wheel pressure sensors can also be checked against each other when valves connect them to one common pressure, a method described in a Lucas/ZF patent that singles out the drifting sensor and its error. Likely causes are sensor drift, trapped pressure in the rear circuit or a ground offset.
C0578 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of C0578
- Check engine light and brake warnings (GM hybrids)
- Rear brake pressure shown although no brake is applied
- Code sets again after a short drive
Common causes of C0578
- Most likelyZero point of sensor D drifted
- PossiblePressure trapped in the rear circuit, e.g. sticking caliper or valve
- Less likelyGround offset between sensor and brake module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Brake pressure sensor dBrake control module
What each part of C0578 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 78 | The exact fault in that area. |
What to do next
- Note C0578 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C0578
What does C0578 mean?
C0578 means "Brake Pressure Sensor D Circuit Range/Performance". For sensor D the range/performance check targets a signal that is electrically fine but implausible. It is a generic code, so it means the same on every make.
Is it safe to drive with C0578?
Drive gently and only to a workshop. With C0578 the car can go into limp mode (reduced power) to protect itself.
Will C0578 fail an emissions test?
C0578 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C0578 to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will C0578 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.