The P0242: Turbocharger Boost Sensor B Circuit High refers to an issue where the voltage in the turbocharger boost sensor B circuit is higher than expected. This problem can be caused by a faulty sensor, wiring issues such as shorts or opens, or a malfunction in the Powertrain Control Module (PCM). When this code is triggered, it indicates that the sensor is receiving or sending too much voltage, which can disrupt the turbocharger’s ability to properly manage boost pressure.
P0242 – Quick Overview
| Meaning | P0242: Turbocharger Boost Sensor B Circuit High |
| Is it serious? | Yes, this code can be serious as high voltage in the sensor circuit may lead to incorrect boost pressure readings, affecting engine performance and potentially causing damage. |
| Possible causes | – High voltage in the turbocharger boost sensor B circuit – Faulty turbocharger boost sensor B – Wiring issues such as shorts or opens – Faulty PCM |
| How to diagnose? | – Test the turbocharger boost sensor B for proper operation. – Check for high voltage in the sensor circuit. – Inspect the wiring and connectors for defects. – Replace or repair any faulty components. |
P0242 Meaning
The P0242: Turbocharger Boost Sensor B Circuit High code indicates that the voltage in the circuit for the turbocharger boost sensor B is higher than it should be. This could be due to issues with the sensor itself, the wiring or connectors, or the vehicle’s PCM. When this code is triggered, it suggests that the turbocharger’s boost pressure is not being monitored accurately due to excessive voltage, which can lead to engine performance issues.
Step-by-step diagnostic guide
Follow the outlined procedure to diagnose this DTC by eliminating possible causes one by one.
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check if there are any other related codes present. These might give additional clues about the problem. | OBD-II Scanner |
| Inspect the Turbocharger Boost Sensor B | Visually inspect the turbocharger boost sensor B for any signs of damage, corrosion, or disconnection. Ensure it is securely attached and functioning properly. | Flashlight, Safety Gloves |
| Test the Sensor Using a Multimeter | Use a multimeter to measure the voltage in the turbocharger boost sensor B circuit. Compare the readings to the manufacturer’s specifications to determine if the voltage is too high. | Multimeter, Manufacturer’s Specifications |
| Inspect Wiring and Connectors | Carefully check the wiring and connectors leading to the turbocharger boost sensor B for any signs of wear, corrosion, or shorts. Look for loose or disconnected wires that could cause high voltage. | Flashlight, Multimeter |
| Repair or Replace Damaged Wiring/Connectors | If any wiring or connectors are damaged, shorted, or corroded, repair or replace them. Ensure all connections are secure and free from contaminants. | Wire Strippers, Electrical Tape, Replacement Wires/Connectors |
| Check the PCM (Powertrain Control Module) | Inspect the PCM and its connections for any signs of damage or loose connections. If the PCM is suspected to be faulty and causing high voltage, it may need reprogramming or replacement. | OBD-II Scanner, Multimeter |
| Clear the Code and Test Drive | After completing the necessary repairs, clear the P0242 code using the OBD-II scanner. Take the vehicle for a test drive to ensure the issue is resolved and the code does not return. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, re-scan the vehicle to ensure the P0242 code has not reappeared. If the code returns, further diagnosis may be required. | OBD-II Scanner |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko