OBD-II trouble code
P0239: Turbocharger/Supercharger Boost Sensor "B" Circuit Malfunction
SAE J2012 APR2002: boost sensor B circuit. The 2009 GT-R manual uses P0241 and P0242 for bank 2, not this row. The printed pair is RepairPal's boost sensor, scoped to sensor B. Wiring is outside it.
Quick facts
- System
- Powertrain
- Category
- Fuel & Air
- Severity
- Medium severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $236 – $273 (turbocharger boost sensor B replacement, parts and labor, RepairPal national average updated 3 September 2026; wiring and the MAP sensor are outside this pair)
- DIY difficulty
- Intermediate DIY
Browse every code in P0200–P0299, or start from the full code library.
What does P0239 mean?
SAE J2012 APR2002 names P0239 Turbo/Super Charger Boost Sensor "B" Circuit. Section 3.8 says a letter is manufacturer-defined, starting with component A, so B is not a physical corner until the diagram says so. Section 3.1 is the general circuit row: a fixed value or no response where a high-or-low split is not what stored, or the row used beside the low and high codes. P0240 is range/performance, P0241 is circuit low, and P0242 is circuit high.
The 2009 GT-R boost-sensor section was read because it is a two-sensor car. Bank 2 is connector F30, and the manual assigns that sensor to P0241 (circuit low) and P0242 (circuit high). P0239 is not in the detection logic. GM 11OBDGS2 (2011) turbo-boost rows that were read list P0236, P0237, and P0238. They do not list a sensor B circuit code. The 1997 Ford diesel pinpoint test D is a single MAP and does not define a B sensor.
Moving the F30 voltage table onto P0239 would test a code that manual does not use. RepairPal's turbocharger boost sensor replacement, updated 3 September 2026, is $236–$273 (labor $80–$118, parts around $155). The printed pair is that national average, scoped to sensor B because SAE J2012 names this code boost sensor B. RepairPal does not publish a separate sensor-B price. The GT-R bank 2 sensor stays on P0241 and P0242. A wiring repair is outside the pair. The MAP average of $201–$242 is a different line. Diagnosis is $125–$183 labor and is separate.
Common causes
- An open wire in the sensor-B circuit, which is this general circuit row
- A short in that circuit, on a calibration that files the short here instead of on P0241 or P0242
- Boost sensor B not producing a response
- A connector or terminal on the sensor-B circuit
Symptoms
- P0239 stored
- A sensor-B signal that is fixed or does not respond
- P0241 or P0242 stored when the calibrator uses the low and high rows beside this one
Diagnostic steps
- 1.Read the code again. P0241 and P0242 have a GT-R procedure. P0239 did not appear in that section.
- 2.Use the diagram to see whether a second boost sensor exists, and which letter the calibrator assigned. Section 3.8 does not place B at the rear or on a particular bank.
- 3.Do not unplug F30 and call a zero reading a short. That connector's published test belongs to P0241 and P0242, and even there a missed 5 V reference is three faults, not one.
- 4.The printed pair is RepairPal's boost-sensor average, scoped to sensor B. Wiring and the $201–$242 MAP line stay outside. Do not use the F30 table as this code's pass.
- 5.Verify against the code the car stored. Clearing P0239 and then running the bank 2 confirmation does not prove this row.
Repair cost
$236 – $273 (turbocharger boost sensor B replacement, parts and labor, RepairPal national average updated 3 September 2026; wiring and the MAP sensor are outside this pair)
RepairPal's turbocharger boost sensor replacement, updated 3 September 2026, is $236–$273 (labor $80–$118, parts around $155). The printed pair is that national average, scoped to sensor B because SAE J2012 APR2002 names P0239 Turbo/Super Charger Boost Sensor "B" Circuit. Section 3.8 leaves the letter to the manufacturer. RepairPal's estimator does not label A or B. The 2009 GT-R section assigns bank 2, connector F30, to P0241 and P0242, not to P0239. GM 11OBDGS2 (2011) and the 1997 Ford diesel pinpoint test D do not define a sensor B on this code. Wiring is outside the pair. MAP sensor replacement is $201–$242 and is outside. Diagnosis is $125–$183 labor and is separate.
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DIY vs shop
This is an intermediate DIY job. It usually involves diagnostic steps, specialty parts, and some careful work in tight spaces. If you have the tools and a service manual or trustworthy video for your specific vehicle, it is achievable in a weekend. Otherwise, a competent independent shop will be faster.