C0273Brake Booster Pressure Sensor Circuit Malfunction
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- ABS and traction warning lamps on
- ABS and stability functions disabled
- Likely causes
- PossibleOn GM vehicles internal fault of the brake control module
- PossibleLow supply voltage, poor ground or corroded module connector
- RareFaulty booster pressure sensor or its wiring
- Repair
- Hard · Usually a job for a workshop.Typical cost: €50 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.