P258BVacuum Pump Control Circuit A Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P258B is the range/performance code for control circuit A of the vacuum pump: the pump is commanded, but its monitoring feedback or the vacuum it produces does not fit. Ford's 2018-2019 hybrid OBD summary sets it from the brake module when the monitoring line sits outside 1.3-5.0 V with the relay off, or below 250 mV for 1 s with the relay on. FCA case S1805000006 for 2017-2020 Pacifica, Cherokee, Wrangler, Gladiator and Ram 1500 links P258B, often with ABS code C1252, to pumps that cannot keep enough vacuum and asks for checks of fuses, terminals, hoses and check valves plus a PCM update from 2019. Audi's Q3 bulletin 2072305 (2021-2024) traces P258B00 to a blown pump fuse after the ABS connector had been unplugged while the engine was running. The brake pedal may feel hard.
- What you may notice
- Engine, brake or stability warning lamp on
- Hard brake pedal, less brake assist
- Start-stop fault message
- Likely causes
- LikelyWorn or failed electric vacuum pump
- PossibleLeaking hose or check valve that makes the pump run too long
- PossibleBlown pump fuse, spread terminals or poor ground
- RareOutdated engine software controlling pump duty cycle
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €20 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.