P2596Turbocharger Speed Sensor B Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- With P2596 the engine computer sees the line of turbocharger speed sensor B sitting above its valid window - the usual pattern for a signal shorted to supply voltage, an interrupted ground or a defective sensor output. The code was added to Bentley's W12 speed-sensor bulletin in its later revision (2053348/10, December 2022), which also brought in the Bentayga; it is handled like the low fault: work through the wiring checks including a short to B+, and if they pass, fit a new sensor for the affected bank and report back if the fault returns. P2595 is the low-voltage counterpart, P2594 a wrong but electrically valid speed, and P2581 the same fault on sensor A. Expect the warning lamp and possibly reduced boost.
- What you may notice
- Malfunction indicator lamp on
- Implausibly high speed for the second turbo in live data
- Possible boost reduction
- Likely causes
- LikelySignal wire of sensor B shorted to supply or battery voltage
- PossibleInterrupted ground of sensor B
- PossibleDefective output stage of speed sensor 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: €100 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.