Turbocharger Boost Sensor B Circuit High
The P0242 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the turbocharger boost sensor B that is higher than the expected range. This sensor monitors boost pressure and sends a voltage signal to the ECM. A high voltage reading suggests a short to power, faulty sensor, or wiring issue. This can lead to incorrect boost control, reduced engine performance, and potential turbocharger damage.
01. Most Common Causes
- Faulty turbocharger boost sensor B
- Short to voltage in sensor circuit
- Damaged wiring or connector
- ECM software or hardware issue
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power and acceleration
- Poor fuel economy
- Possible turbocharger overboost or underboost
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect boost sensor B wiring and connector for damage or corrosion.
Step 3: Test sensor voltage with a multimeter; compare to manufacturer specs.
Step 4: Check for shorts to power or ground in the sensor circuit.
Step 5: Replace sensor if faulty; clear codes and test drive.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause reduced performance and potential turbo damage. Limp mode may activate.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on sensor cost and accessibility.