Error code

OBD2 P0240

OBD2P0240
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Turbo/Super Charger Boost Sensor 'B' Circuit Range/Performance.

Severity

moderateCan drive, but performance issues may occur during high-power operation.

Summary

P0240 indicates a problem with the boost sensor 'B' circuit in turbocharged or supercharged engines, affecting the measurement of air density and leading to poor performance.

Symptoms

  • Poor engine performance during high-power operation
  • Abnormal noise from forced-induction system
  • Smoke in exhaust
  • High engine temperature

Common Causes

  • Air leaks in intake manifold or turbocharger
  • Wastegate issues (stuck or leaking)
  • Defective turbocharger
  • Electrical problems affecting the boost sensor signal
  • Faulty boost sensor

Diagnosis

  1. Check for air leaks in intake manifold and turbocharger hoses.
  2. Inspect wastegate function manually.
  3. Measure boost pressure using a gauge to identify specific issues (e.g., under/over 14 psi).
  4. Test electrical connections and sensor voltage readings.

Fixes

  • Repair or replace faulty turbocharger, wastegate, or boost sensor.

FAQ

What should I do if my car has P0240?

Check for air leaks and inspect the wastegate. If issues persist, test electrical connections and consider replacing faulty components.

Is it safe to drive with P0240?

It is generally drivable but may experience performance issues during high-power operation.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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