C0273 code meaning
Brake Booster Pressure Sensor Circuit Malfunction
What C0273 means
Neither the reachable J2012 lists nor any maker describe C0273 as a booster pressure sensor code. GM's PIP5094 does include the number, and AA1Car translates it, like C0271 and C0272, as EBCM Malfunction, meaning an internal fault of the brake module. In that case the module is normally replaced after supply, ground and connector have been checked. The sensor in the title measures the vacuum or pressure stored in the brake booster. GM's patent US7467544 compares it with manifold vacuum at closed throttle and flags a reading drifted high or low, and can even correct a moderate drift. Electrical faults of that sensor are usually stored under the powertrain codes P0556 to P0559.
C0273 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0273
- ABS and traction warning lamps on
- ABS and stability functions disabled
Common causes of C0273
- PossibleOn GM vehicles internal fault of the brake control module
- PossibleLow supply voltage, poor ground or corroded module connector
- Less likelyFaulty booster pressure sensor or its wiring
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
ABS control moduleBooster pressure sensorBrake booster
What each part of C0273 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 73 | The exact fault in that area. |
What to do next
- Note C0273 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 C0273
What does C0273 mean?
C0273 means "Brake Booster Pressure Sensor Circuit Malfunction". Neither the reachable J2012 lists nor any maker describe C0273 as a booster pressure sensor code. It is a generic code, so it means the same on every make.
Is it safe to drive with C0273?
Drive gently and only to a workshop. With C0273 the car can go into limp mode (reduced power) to protect itself.
Will C0273 fail an emissions test?
C0273 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 C0273 to fix?
Difficulty: hard. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will C0273 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.