P0240 — Turbocharger Boost Sensor B Malfunction
Drive with caution — fix soon.
What P0240 means
This code means the computer has detected a general fault with turbocharger boost sensor B, which on many engines monitors a second turbo or a different point in the intake. It usually points to a faulty sensor, wiring or connector problems, or a boost-related fault. It's a fixable turbo code, often resolved by replacing the sensor or repairing the circuit.
Common symptoms
- Check engine light is on
- Loss of power or sluggish acceleration
- Engine may enter reduced-power (limp) mode
- Poor fuel economy
- Hesitation or uneven power delivery
Common causes
- Faulty turbocharger boost sensor B
- Wiring or connector damage at the sensor
- Boost leak in the intake or turbo plumbing
- Clogged or cracked sensor pressure hose
- Internal sensor failure or contamination
Typical repair cost
$100 – $400
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0240 code?
Short trips are usually okay, but the car may limit power and feel weak. Avoid hard acceleration and towing, and get it diagnosed soon.
How much does it cost to fix a P0240 code?
Most repairs run $100 to $400. A sensor replacement is on the lower end, while wiring repairs or chasing a boost leak adds to the bill.
Is a P0240 code serious?
It's moderate. It usually won't leave you stranded right away, but continued driving with reduced power isn't ideal, so don't put off the repair.
What does sensor B refer to in P0240?
Sensor B is a second boost pressure sensor, often for a second turbocharger or a different spot in the intake system. A scan tool and the wiring diagram help pinpoint which one it is.