Powertrain
generic / SAE
P2595
Turbocharger Speed Sensor B Circuit Low
Turbo speed sensor B signal voltage below the lower limit — short to ground or open supply. Boost control tracks commanded vs. actual manifold pressure; persistent deviation means wastegate, vanes, hose or actuator are not delivering the requested pressure.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 95
Possible causes
- Signal wire shorted to ground high
- Connector pins corroded - high contact resistance low
- Harness chafing through insulation low
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–1000 €
- Estimated time: 0.6–2.5 h
- Component: turbo speed sensor b
- Component: sensor wiring
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012