P2588Turbocharger Boost Control Position Sensor B Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2588 is stored when the voltage from position sensor B of the second boost actuator drops below the lowest value a working sensor can deliver - most often a grounded signal line or a missing 5 V reference. No manufacturer documents P2588 publicly; the thresholds known for sensor A give the order of magnitude. Ford's 2023 diesel OBD summary flags P2564 below 0.15 V, and GM's 2009 Duramax table uses 0.277 V for 1 s once the engine has run 3 s. A shorted reference may also upset other sensors on the same supply. P2589 is the high-side fault, P2587 a position error with a usable signal, and P2564 the same low fault on sensor A. Power is normally reduced.
- What you may notice
- Malfunction indicator lamp on
- Power reduced, boost held low
- Further sensor codes if a shared reference is shorted
- Likely causes
- LikelySignal wire of position sensor B shorted to ground
- PossibleLost or shorted 5 V reference supply
- PossibleFailed position sensor B in actuator B
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €60 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.