OBD-II trouble code
P0241: Turbocharger/Supercharger Boost Sensor "B" Circuit Low
SAE J2012 APR2002: boost sensor B circuit low. The 2009 GT-R manual maps that number to bank 2, connector F30. The printed pair is the boost sensor after the bank 2 table fails.
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 replacement, parts and labor, after the 2009 GT-R bank 2 pressure table fails; F30 wiring and the bank 1 sensor are outside this pair)
- DIY difficulty
- Intermediate DIY
Browse every code in P0200–P0299, or start from the full code library.
What does P0241 mean?
SAE J2012 APR2002 names P0241 Turbo/Super Charger Boost Sensor "B" Circuit Low. Section 3.3 measures the low characteristic at the module pin with the circuit connected. Unplugging the sensor is a later diagnostic step, not the definition of the code. Section 3.8 leaves letter B to the manufacturer.
The 2009 Nissan GT-R service section names P0241 turbocharger boost sensor (bank 2) circuit low input: an excessively low voltage from the sensor is sent to the ECM. Causes printed there are an open or shorted harness and the sensor itself. P0643 stored with it is diagnosed first. Bank 2's connector is F30. Bank 1's connector F14 is P0237 and P0238.
After ground M95 passes, with the ignition off, the sensor is disconnected and the ignition turned on. F30 terminal 1 to ground should be approximately 5 V. The fail text is one sentence covering an open, a short to ground, and a short to power. Ignition goes off and the ECM connector comes off before continuity is measured from F30 terminal 3 to ECM F102 terminal 75, and the harness is checked for a short to ground and a short to power as its own result. The signal check is F30 terminal 2 to F102 terminal 79, same short checks. The pressure pump is last, at 10–30°C (50–86°F), gauge calibrated. Terminal 79 against terminal 75 reads about 2.03 V at 0 kPa relative and about 2.67 V at +40 kPa (300 mmHg, 11.81 inHg). A failed table replaces the bank 2 sensor.
A zero reading on an unplugged signal wire is not step 2. Step 2 is the 5 V supply. Calling that zero a short, and stopping, skips the open and the short-to-power half of the miss, and it skips the ECM-disconnected continuity test.
Common causes
- P0643 stored with P0241 on a 2009 GT-R, diagnosed before F30
- F30 terminal 1 missing approximately 5 V, repaired as an open, a short to ground, or a short to power
- No continuity from F30-3 to F102-75, or from F30-2 to F102-79, ECM disconnected, ignition off
- A short to ground or a short to power found on those wires as a separate check from continuity
- Bank 2 sensor voltage outside about 2.03 V at 0 kPa or about 2.67 V at +40 kPa
- Connector F14, which is bank 1 on that manual and is the wrong sensor for this code
- A 6.0L Ford pin 1 to pin 3 reference check, which is a different engine's P0237 step
Symptoms
- P0241 stored
- An excessively low bank 2 voltage on a GT-R, which is the detecting condition that manual prints
- P0643 stored beside it
- A bank 2 table that will not show about 2.03 V with the pump at 0 kPa after the harness passes
- P0242 when the same sensor is high instead
Diagnostic steps
- 1.If P0643 is present on a GT-R, stop and diagnose that code. The boost-sensor section says so.
- 2.Ignition off. Check ground connection M95 before any voltage is taken.
- 3.Disconnect F30. Ignition on. Terminal 1 to ground, approximately 5 V. A miss is three repairs: open, short to ground, short to power. Write down which one tested bad.
- 4.Ignition off. Disconnect the ECM. Continuity F30-3 to F102-75, then short-to-ground and short-to-power on that wire. Then F30-2 to F102-79 with the same two short checks. Do not ohm those wires with the ECM plugged in.
- 5.At 10–30°C, pressure-pump the bank 2 sensor and read terminal 79 against 75. About 2.03 V at 0 kPa and about 2.67 V at +40 kPa. Replace the sensor only when this inspection fails.
- 6.Leave the Ford 4.5–5.5 V pin 1 measurement on the 6.0L P0237 step. Those pins are not F30.
- 7.Verify with the GT-R confirmation: ignition on at least 5 seconds, after the 10-second off precondition if a confirmation was already run.
Repair cost
$236 – $273 (turbocharger boost sensor replacement, parts and labor, after the 2009 GT-R bank 2 pressure table fails; F30 wiring and the bank 1 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 for the sensor the GT-R table replaces. Connector F30, ground M95, and the ECM are outside the pair. Bank 1 is a different sensor on that car. The MAP average of $201–$242 is a different RepairPal line. 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.