P2593 code meaning
Turbocharger Speed Sensor B Circuit
Powertrain system Generic code P25xx codes Check engine light
What P2593 means
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.
P2593 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2593
- Malfunction indicator lamp on
- Power reduced, often only slightly with one turbo affected
- No speed value for the second turbo in live data
Common causes of P2593
- Most likelyConnector problem at speed sensor B
- PossibleHarness to the second turbocharger damaged by heat or chafing
- PossibleInternal failure of speed sensor B
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Turbo speed sensor bSensor wiring
What each part of P2593 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| 93 | The exact fault in that area. |
What to do next
- Note P2593 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2593
What does P2593 mean?
P2593 means "Turbocharger Speed Sensor B Circuit". P2593 concerns the second turbocharger speed sensor, found where an engine has two turbochargers, for example one per cylinder bank. It is a generic code, so it means the same on every make.
Is it safe to drive with P2593?
Drive gently and only to a workshop. With P2593 the car can go into limp mode (reduced power) to protect itself.
Will P2593 fail an emissions test?
Yes, it can. P2593 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2593 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2593 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.