P0234 OBD-II Trouble Code: Engine Overboost Condition

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0234 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0234 code

P0234 is a diagnostic trouble code (DTC) for "Engine Overboost Condition". 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 for $69.99. 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$69.99$20.00
Toyota$69.99$20.00
BMW$69.99$20.00
SCHEDULE P0234 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P0234 code definition

Engine Overboost Condition

What the P0234 code means

P0234 is a generic OBD-II code that is triggered when the Engine Control Module (ECM) detects that the intake boost pressure sensor input signals intake pressure above the maximum specified pressure by 4 psi for more than 5 seconds.

What causes the P0234 code?

  • The turbocharger/supercharger wastegate is damaged or sticking

  • The wastegate control valve solenoid is sticking

  • The wastegate control hose is getting blocked and the boost pressure cannot be relieved quickly enough

What are the symptoms of the P0234 code?

  • The Check Engine Light will be illuminated and the P0234 code will be set in ECM memory.

  • The engine overboost condition may cause gaskets or seals to the intake or heads to fail.

  • The engine may run normally until the excessive overboost pressure blows out a gasket or seal.

How does a mechanic diagnose the P0234 code?

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

  • Clears the codes to verify whether the concern comes back

  • Checks the operation of the boost pressure solenoid for proper operation of the wastegate

  • Checks the wastegate for sticking or binding

  • Check the wastegate relief hose for kinks, blockage or damages

Common mistakes when diagnosing the P0234 code

Follow these simple guidelines to prevent misdiagnosis:

  • Check the boost pressure sensor hose for obstructions or kinks

  • Verify that the overboost pressure condition is not from boost pressure sensor incorrect input voltage

How serious is the P0234 code?

  • The boost pressure in the intake can give you a lot of power, but an overboost condition when the engine is not designed to handle it may cause catastrophic engine failure, like a blown engine or blown head gaskets.

What repairs can fix the P0234 code?

  • Replacing the boost sensor if it is not giving the correct input pressure reading to the ECM

  • Replacing the wastegate control solenoid if it is sticking

  • Replacing the wastegate valve if it is sticking or binding

  • Repairing or replacing wastegate hoses due to kinks or blockage of the wastegate lines

Additional comments for consideration regarding the P0234 code

Code P0234 is triggered by the intake boost sensor indicating an overboost condition and the most common failure is the wastegate binding or sticking intermittently.

Need help with a P0234 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.

Check Engine Light
P0234
trouble codes

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0234 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

4,240

Rating Summary
3,884
174
45
26
111
3,884
174
45
26
111
Terry

Terry

28 years of experience
137 reviews
Terry
28 years of experience
Thanks again Terry!
2002 TOYOTA RAV4 - CHECK ENGINE LIGHT IS ON - TEMPE, ARIZONA
Anthony

Anthony

14 years of experience
29 reviews
Anthony
14 years of experience
Came to my house got started right away and did everything pretty fast.
2008 VOLKSWAGEN EOS - CHECK ENGINE LIGHT IS ON - EL PASO, TEXAS
Robert

Robert

28 years of experience
500 reviews
Robert
28 years of experience
Robert is awesome. Great guy and he knows what he's doing. Had a good time just watching him work and learning about my car. He figured out exactly what was going on with my car and was able to let me know the repairs I need in order of priority.
2006 HONDA ACCORD - CHECK ENGINE LIGHT IS ON - SAN JOSE, CALIFORNIA
Tabitha

Tabitha

14 years of experience
106 reviews
Tabitha
14 years of experience
Knows what she is doing, does it quick and correct. Very nice person.
2005 NISSAN 350Z - CHECK ENGINE LIGHT IS ON - SAN DIEGO, CALIFORNIA

More related articles

P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222...
How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...

Related questions

Q: Check engine light is flashing and I have next to none acceleration.

When the engine light is flashing, that means that something is not functioning correctly that could damage the catalytic converter. I would recommend having the computer (ECM) checked for any codes to give you a starting place for diagnosing your...

Q: DTC Help Request

You might have a problem with fretting corrosion in the connectors of the modules of the vehicle. There is a technical bulletin out for your Saturn VUE: 09-06-03-004D, dated December 2010 for corrosion in the small connector pins of the...

Q: Not able to start - 2006 VW Mark 5

Hi there: The P1095 ODB-II trouble code indicates that the O2 sensor signal circuit is slow switching from lean to rich (Bank 1 Sensor 1). When this occurs, it can cause your vehicle to stall rather quickly. However, before you...

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.

1-800-701-6230 · hi@yourmechanic.com