P2593Turbocharger Speed Sensor B Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2593 concerns the second turbocharger speed sensor, found where an engine has two turbochargers, for example one per cylinder bank. It marks an electrical fault on that sensor's circuit that is not further classified; the specific forms are P2595 (low), P2596 (high) and P2597 (intermittent), while P2594 covers a plausibility error. Sensor A is reported separately under P2578-P2582. No manufacturer documents P2593 itself publicly. Bentley's W12 engine carries two such sensors (G688 for bank 1, G689 for bank 2), both engine control units store their faults, and the bulletin prescribes testing for opens, shorts to ground or B+ and wire-to-wire shorts before a sensor is changed. CARB requires these boost-control parts to be monitored.
- What you may notice
- Malfunction indicator lamp on
- Power reduced, often only slightly with one turbo affected
- No speed value for the second turbo in live data
- Likely causes
- LikelyConnector problem at speed sensor B
- PossibleHarness to the second turbocharger damaged by heat or chafing
- PossibleInternal failure of speed sensor B
- 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: €80 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.