P0242 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit High

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0242 code

P0242 is a diagnostic trouble code (DTC) for "Turbocharger Boost Sensor B Circuit High". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0242 DIAGNOSTIC Get a fair and transparent estimate upfront

P0242 code definition

Turbocharger Boost Sensor B Circuit High

What the P0242 code means

P0242 is a generic OBD-II code which indicates that the engine control module (ECM) detected the intake boost pressure sensor B input circuit out of specifications; possibly due to an open circuit, or high voltage condition in the circuit from a short to power.

What causes the P0242 code?

  • The turbo boost pressure sensor B has an internal open circuit

  • The turbo boost pressure sensor B connector is damaged causing an open circuit

  • The turbo boost pressure sensor B wiring is shorted to power between the sensor and the ECM

What are the symptoms of the P0242 code?

  • The Check Engine Light will be illuminated and code P0242 is set in the ECM memory

  • The engine turbo boost may be turned off by the ECM and the engine will lack power

  • The engine will lack power during acceleration

How does a mechanic diagnose the P0242 code?

  • Scans codes and documents the freeze frame data in order to verify the problem

  • Clears the DTC codes to verify whether the concern comes back

  • Checks the operation of the boost pressure sensor signal and compares it to the MAP sensor at engine idle to see if the readings are the same

  • Checks the turbo boost sensor wiring and connector for any signs of shorts to power in the harness

  • Checks the turbo boost sensor connector for corroded pins in the connector that may cause shorting of power in the signal circuit

  • Compares readings to specifications on the sensor data scan

Common mistakes when diagnosing the P0242 code

Follow these simple guidelines to prevent misdiagnosis:

  • Try disconnecting the sensor to see if the short to power and code goes away or changes

  • Check the harness for melting from loose or hanging wire looms; on the exhaust in most cases

How serious is the P0242 code?

  • A short to a power source in the sensor circuit can cause the engine ECM to get internally burned out if the circuit short went over 5 volts.

  • If the ECM gets burned out, then the vehicle may stall and not start (worse case).

  • The failed sensor or circuit will cause the turbocharger to not allow boost to the engine.

What repairs can fix the P0242 code?

  • Replacing the boost sensor if it was open internally and not giving the correct input pressure voltage reading to the ECM

  • Repairing the wiring harness if any shorts to power were found, and securing the harness from getting damaged (Check the ECM for voltage spike damage)

  • Replacing any broken connectors causing the short or open circuits

  • Replacing a shorted ECM, if it was shorted internally, and repairing the cause of the short

Additional comments for consideration regarding the P0242 code

Code P0242 is triggered by the intake boost sensor circuit shorted to power or open completely, causing the signal to the ECM to go way above, or below voltage specifications. The most common failure is the boost sensor internally open, or the harness has been shorted to power on the exhaust manifold.

Need help with a P0242 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

P0242
trouble codes
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0242 code.

SCHEDULE P0242 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,361

Rating Summary
4,946
200
50
30
135
4,946
200
50
30
135

William

16 years of experience
64 reviews
William
16 years of experience
Jeep Grand Cherokee - Check Engine Light is on - Denver, Colorado
Couldn’t be happier with my experience with William. Will happily recommend him to everyone and will definitely be using him again. Fantastic service.

Andrian

31 years of experience
112 reviews
Andrian
31 years of experience
BMW 525i - Check Engine Light is on - Fort Lauderdale, Florida
Highly recommend Adrian for all automotive services. Very professional and extremely knowledgeable about everything related to our car. He explained everything so we knew exactly what was needed and went above and beyond to make the process easy. I would never use another person to work on our cars. EXCELLENT OVERALL!!

Brian

22 years of experience
335 reviews
Brian
22 years of experience
Chevrolet Colorado - Check Engine Light is on - Orange Park, Florida
Brian is a very experienced mechanic. Billing not so sharp. Wrong time (corona-19).to be stiff with adding up, Informing the older customers what to expect? Very sorry to say goodbye to a great mechanic!

Scott

35 years of experience
665 reviews
Scott
35 years of experience
Dodge Grand Caravan - Check Engine Light is on - Phoenix, Arizona
This is the second time I have used his service. All I can say. if he can find my mistakes, he can fix anything. Thanks once again.


More related articles

P0557 OBD-II Trouble Code: Brake Booster Pressure Sensor Circuit Low
P0557 means there is an issue with the brake booster pressure sensor circuit. This could be due to a faulty sensor, vacuum leaks, or broken circuits.
P0284 OBD-II Trouble Code: Cylinder 8 Contribution/Balance Fault
P0284 P0284 code definition The P0284 code being stored indicates that your number eight cylinder is suffering from a problem related to fuel and, thus, can’t function properly. What the P0284 code means Your vehicle’s PCM keeps track of...
B1911 OBD-II Trouble Code: Air Bag Diagnostic Monitor Ground Circuit Short to Battery
B1911 means there is a malfunctioning circuit in the airbag diagnostic monitor, probably due to an electrical problem or faulty monitor.

Related questions

Check engine light flashes on then turns off what does that mean?

A flashing check engine light usually refers to cylinder misfiring. Misfiring should be investigated and resolved promptly - that's why the light flashes versus simply staying steady - because misfiring can damage the catalytic converter which can result in additional...

I have the check engine light on and checked for DTC's it says ECM set and CEM set

Hi there, thanks for writing in about your Volvo. There should be specific alpha numeric "codes" displayed on the Code Reader. Do you see/have those "codes"? These will help pinpoint any faults and assess the issue. I would recommend having...

Hello I have a 2006 f150 XLT with a 2v 4.6. It has a cold air intake from k

Hi, thanks for writing in. I'd be happy to help you. Code P2104 relates the throttle position control actuator, and code P2126 relates to the throttle position sensor. When either of these components is not working properly, this can cause...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com