Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. P0235 OBD-II Trouble Code: Turbocharger Boost Sensor A Circuit Malfunction

P0235 OBD-II Trouble Code: Turbocharger Boost Sensor A Circuit Malfunction

Check Engine Light

P0235 code definition

Turbocharger Boost Sensor A Circuit Malfunction

What the P0235 code means

P0235 is an OBD-II generic code that is triggered when the Engine Control Module (ECM) detects intake boost pressure sensor A input malfunction when compared to the manifold pressure sensor (MAP) at idle, and with the key turned on before starting the engine.

What causes the P0235 code?

  • The turbo boost sensor and the MAP sensor do not correlate the same reading with the engine at idle and when the key is on and the engine is off.

  • The turbo boost pressure sensor A is contaminated or clogged

  • The turbo boost pressure sensor A is slow to respond to changing pressure

What are the symptoms of the P0235 code?

  • The Check Engine Light will be illuminated and the P0235 code set in ECM memory

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

  • The engine may lack some power during acceleration if the boost sensor is failing to register the correct amount of boost pressure

How does a mechanic diagnose the P0235 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 sensor compared to the MAP sensor
  • Checks the turbo boost sensor for blockage of the sensor port
  • Checks the turbo boost sensor connector for loose or corroded pins

Common mistakes when diagnosing the P0235 code?

Follow these simple guidelines to prevent misdiagnosis:

  • Check the boost pressure sensor hose for obstructions or kinks
  • Verify that the connections to the sensor are secure and not leaking or kinked

How serious is the P0235 code?

  • The boost pressure in the intake can give you a lot of power. If the turbo boost sensor is malfunctioning, then the ECM may disable the turbo boost and you would have a lack of power.

What repairs can fix the P0235 code?

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

  • Repairing or replacing hoses and connections to the turbo boost sensor that have kinks or blockage of the lines

Additional comments for consideration regarding the P0235 code

Code P0235 is triggered by the intake boost sensor indicating a malfunction condition of which the ECM cannot determine the cause. The most common failure is with the boost sensor.

Need help with a P0235 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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.


More related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...

Related questions

Q: Error code p1516 with check engine and reduced engine power unable to drive over 30mph car is revving up put no power

The code P1516 is is for the throttle position sensor. It looks like the car's computer is putting the engine in "failsafe mode" to prevent the car from being driven much further. A technician would need to examine the system...

Q: P0700 Transmission Control System MIL Request

Hi! A P0700 code stored in the powertrain control module (PCM) indicates that there is a code stored in the transmission control module (TCM) that can be accessed by looking into the TCM with an appropriate scan tool. Having the...

Q: I bought a used vw beetle 2001. diag test came up with codes t0300 t0303 t0172 t0768 mechanic said he would charge 900.00 for the

Each of these codes are for different problems, and would need to be diagnosed. If you are low on coolant, then your misfire may be due to a blown head gasket and the first three codes. The last code, P0768,...