Powertrain, generic (extended)

P2597 Turbocharger Speed Sensor B Circuit Intermittent

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2597 records short interruptions or jumps in the signal of the second turbocharger speed sensor, between which the circuit works normally. Such faults usually sit in a connector, a wire that breaks contact under engine movement or heat soak, or a sensor that drops out when hot. No manufacturer documents P2597 publicly. As an analogy, Bentley's W12 bulletin for the same sensor stresses reproducing the customer's driving situation - load, gradient, speed, light and hard acceleration - before deciding on a repair, which is exactly what a sporadic fault demands. CARB requires electronic boost-control components to be monitored. Continuous electrical faults on sensor B are P2593, P2595 and P2596; P2582 is the same pattern on sensor A.

Likely causes

Loose terminal or poor pin contact at sensor B
Wire breaking contact under engine movement or heat soak
Speed sensor B dropping out when hot

Symptoms

  • Occasional warning lamp, sometimes only after long drives
  • Short power dips under load
  • Dropouts in the speed trace of the second turbo

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–1,200
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

P2593P2594P2595P2596P2582

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