What Does P2590 Mean?
The turbocharger boost control position sensor B is sending an intermittent or erratic signal to the PCM. This indicates the sensor signal is unstable, dropping out, or providing unreliable position data for the wastegate or variable geometry turbo actuator.
Common Causes
40%
Damaged wiring or loose connections at boost control position sensor
30%
Faulty turbocharger position sensor with intermittent internal failure
15%
Corroded or contaminated sensor connector terminals
10%
Mechanical binding or sticking in turbo actuator causing sensor signal disruption
5%
Poor sensor ground circuit connection or high resistance
Diagnostic Steps
1
Step 1: Inspect sensor connector for corrosion, oil contamination, or damaged pins - clean and apply dielectric grease if needed
2
Step 2: Wiggle test wiring harness while monitoring sensor voltage in live data to identify intermittent connections
3
Step 3: Measure sensor reference voltage and ground circuit integrity with key on - should see stable 5V reference
4
Step 4: Monitor position sensor signal during manual turbo actuator movement to verify smooth voltage transition
5
Step 5: Check for exhaust leaks or carbon buildup affecting turbo actuator movement
Estimated Repair Cost
$200 - $900
Parts + labor, varies by vehicle and location
The turbocharger boost control position sensor B is sending an intermittent or erratic signal to the PCM. This indicates the sensor signal is unstable, dropping out, or providing unreliable position data for the wastegate or variable geometry turbo actuator.
The most common cause of P2590 (Turbocharger Boost Control Position Sensor "B" Circuit Intermittent/Erratic) is: Damaged wiring or loose connections at boost control position sensor
Typical repair costs for P2590 range from $200 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Reduced engine power and acceleration capability. May experience hesitation or surging during boost conditions, but safe to drive at reduced performance.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2590 to identify the root cause.
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Quick Info
Category
Powertrain
System
Forced Induction System
Difficulty
Type
Generic (SAE)
Recommended Tools
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