Powertrain, generic (extended)

P2595 Turbocharger Speed Sensor B Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2595 is logged when the signal of turbocharger speed sensor B stays below the range the engine computer accepts, as with a short to ground or a sensor whose output has collapsed. Bentley names it for the W12 in Continental GT, GTC and Flying Spur from 2018 and later also in the Bentayga, stored in engine control unit 1 or 2. Unlike the plausibility code P2594, which may first be cleared and retested, the bulletin goes straight to the replacement of the affected sensor (G688 or G689) once wiring tests for opens and shorts pass; on the Bentayga the bank 1 sensor is much harder to reach. The opposite electrical fault is P2596, sensor A reports the same condition as P2580.

Likely causes

Speed sensor B with collapsed output
Signal wire of sensor B shorted to ground
Corroded or contaminated connector at sensor B

Symptoms

  • Malfunction indicator lamp on
  • Speed of the second turbo shown as zero or very low
  • Possible reduction of boost

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,200
Time1–8 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

turbo speed sensor bsensor wiring

Related codes

P2593P2594P2596P2597P2580

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.