Guide To P0238 OBD Error Code Solutions

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The OBD code P0238 can be defined as Turbocharger Boost Sensor A Circuit High

This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model.

This fault code would start appearing when the powertrain control module which is also known as engine control module in some cases would detect the intake boost pressure sensor A input circuit out of specifications. This would indicate a case of open circuit or high voltage condition in the circuit.

What causes this problem with the Turbocharger Boost Sensor A Circuit High?

• Boost pressure sensor harness can be opened or shorted
• There can be bad electrical connection in the boost pressure sensor circuit
• Faults in the boost pressure sensor
• Defects in the turbo/super charger engine over temperature
• Ignition misfire might exceed the calibrated threshold
• Defaults in the knock sensor

1. Boost pressure sensor - A faulty Boost pressure sensor can be troublesome. You can always rely on us as we have best auto parts for our customers.
2. Turbocharger - If everything is alright with Boost pressure sensor, then there is surely some defect in Turbocharger. Get it replaced before the situation gets worse. We have top notch turbo kit for our customers.
3. Supercharger - P0238 code can display due to some issues in the Supercharger. So, it is very important to replace the Supercharger Kit with us at equitable prices.
4. Knock sensor - Do you remember when was the last time you got your car Knock sensor checked up? A faulty Knock sensor can cause a lot of issues like displaying P0238 code.
5. Powertrain Control Module - There can be some issues with the Powertrain Control Module due to which you may see P0238 code appearing over and over again. Visit us to buy best quality PCM online.
6. Engine Control Module - Are you facing some faults in your Engine Control Module? Don’t worry and get them replaced or else P0238 code can turn up.
7. Boost Control Solenoid - Common cause behind this P0238 error code can be some fault in Boost Control Solenoid. So, it will be a good decision to replace them now.

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0238 here:

Common Symptoms

• The check engine light can start illuminating and this would trigger the code
• The engine turbo boost may be turned off by the engine control module and the engine will lack power
• There can be lack of power in the engine during acceleration if the boost sensor circuit is shorted and cannot input the correct amount of boost pressure to the engine control module

Looking out for some ways with the help of which you can correct this fault code? Then have a look below:

• First of all, you must check for technical service bulletins for your particular vehicle. Your issue may be a known issue with a known fix put out by the manufacturer and can save you time and money during diagnosis. A thorough visual inspection is critical when trying to solve this particular DTC. Faulty connections or faulty wiring can be the root of the problem more than anything else. Disconnect the connectors at the boost sensor "A" and boost control solenoid "A" and look carefully at the contact terminals (the metal parts inside the plastic plug) for evidence of spreading. Using silicone dielectric compound on all connections during reassembling
• The ignition key should be turned on with engine off back probe the boost sensor reference wire at the sensor connector with a digital volt ohm meter and check for 5 volts. If voltage is correct back probe the boost sensor signal wire should between .2 volts and .5 volts. If correct go to next step, if not then you must suspect a faulty boost sensor
• Leave DVOM connect and then the car engine should be started and using a hand-held vacuum pump apply vacuum to the turbocharger wastegate vacuum motor. The voltage should increase, if it does, then you should suspect a faulty powertrain control module and if it does not, then the defected turbocharger should be suspected

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The flow of diagnosis should begin with the most common turbo problems and working systematically down the line too the least likely. To carry out the process of diagnosis, you must have a vacuum gauge and dial indicator. Have a look at these steps mentioned below:

• The codes should be scanned and document the freeze frame data in order to verify the problem
• All the codes should be cleared to verify whether the concern comes back
• The operation of the boost pressure sensor should be checked compared to the MAP sensor
• You must inspect the turbo boost sensor for blockage of the sensor port
• Carefully check the turbo boost sensor connector for loose or corroded pins

Common Mistakes When Diagnosing The P0238 Code

• You can always try to disconnect the sensor to check if the short and code go away
• The harness should be checked for melting from loose or hanging wire looms