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P012A OBD Error Code: Problem & Solutions

OBD Code P012A - Turbocharger/Supercharger Inlet Pressure Sensor Circuit (Downstream of throttle valve)

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The OBD-II Code powertrain control module failure can be defined as a turbocharger/supercharger inlet pressure sensor circuit.


The powertrain control module or the PCM keeps an eye on the turbocharger/supercharger inlet pressure sensor circuit signal. The P012A OBD code is set in by the powertrain control module when the turbocharger/supercharger inlet pressure sensor signal is out of factory specifications.

Learn More About OBD Error Code P012A

It is the turbocharger/supercharger inlet pressure sensor which would tell the engine control module how much air is being forced into the engine. If the PCM detects that there is some incorrect signal from the sensor, then it will set P012A fault code. Now due to this the vehicle would be sent into the “limp home mode”, which would limit the amount of power out of the engine and would protect the other components from getting damaged.


What causes this problem with the Turbocharger/Supercharger Inlet Pressure Sensor Circuit (Downstream of throttle valve)?


  • There can be some defects in the turbo/supercharger inlet pressure sensor
  • The wiring harness may be broken or damaged
  • There can be issues within general electrical system
  • Problems with the engine control module
  • Pin/connector can have some problems like corrosion, overheating etc
  • The car air filter may be clogged or damaged

Replace/Repair These Parts To Fix OBD Code P012A

  1. Powertrain Control Module - Damaged PCM hampers the engine timing. Find all the Powertrain related parts with us.
  2. Turbocharger - OBD Error Code P012A can simply be due to faulty Turbocharger. Replace old and damage components now!
  3. Supercharger - If everything is alright with PCM, then there is surely some defect in Supercharger. Get it replaced before the situation gets worse.
  4. Pressure Sensor - There can be some issues with the Pressure Sensor due to which you may see P012A code appearing over and over again. Visit us to buy best quality Pressure Sensor online.
  5. Engine Pressure Sensor - OBD Code P012A can flash if the Engine Pressure Sensor is damaged. You must replace it with a brand new one online with us.

Symptoms Of OBD Error Code P012A

It is essential 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 P012A here:


Common Symptoms


  • Vehicle may start entering limp mode
  • Noises can start coming from car engine
  • Bad overall performance
  • The issue of engine misfiring can arise
  • Problem of stalling
  • Bad overall fuel mileage

How To Correct P012A Turbocharger/Supercharger Inlet Pressure Sensor Circuit (Downstream of throttle valve)

Have a look at some ways with which you can correct the P012A code:


  • The first and the foremost thing which you should do is to replace the turbo/supercharger inlet pressure sensor
  • There can be some issue with the wiring harness, which can cause problems. So, you must get it repaired or replaced
  • If your car air filter is clogged, then the best idea would be to replace it with a brand new one


There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of air intake filter, fuel pressure sensor, relay wiring and many more. Now all your problems would vanish within no time.

Easy Diagnosis Of Engine Error OBD Code P012A

The TCIP and surroundings should be visually inspected. Since we are aware about the nature of these fault codes, it makes us think that there is surely some sort of physical problem causing this issue. That is the reason why you must check the harness thoroughly because the harnesses for these sensors typically run along areas where extremely high temperatures are present. You must refer to Downstream of Throttle valve if you want to locate which sensor circuit is malfunctioning. Downstream means after the throttle valve or the side closer towards the intake manifold. The throttle valve is generally mounted to the intake manifold. Once the TCIP has been located, then the wires coming out of it should be followed and you must inspect frayed/chafed/cut wires that may be causing an issue. The location of the sensor depends on your vehicle make and model and you must have enough access to the sensor’s connector. You can always disconnect it and inspect the pins for corrosion.


The use of a circuit would totally depend on the make and model of your vehicle. Locate the fuse boxes just about anywhere in the car. Some of the good places where it can be placed are under the dash, behind the glove box, under the hood, under a seat etc. Carefully locate the fuse and make sure it fits within the slot tightly and make sure that it doesn’t blow.


The other step is to check your car air filter. There can be some signs of clogging or dirtiness, so you must visually inspect your car air filter. You must replace your car air filter if it is clogged or showing any signs of damage. This is surely a cost-efficient way because air filters are inexpensive and easy to replace. You can always check to see if your car air filter can be cleaned; in that case there would be no need to replace it. Cleaning it would be a better idea than replacing the entire assembly.


If you have checked out almost everything and still not able to find a malfunction, then you must check the circuit itself. This may include disconnect the ECM or PCM electrical connector so make sure your battery is connected. You can always perform some basic electrical tests on the circuit. This can be done by checking the continuity, check for short to ground, power and more. If there is any kind of open or short, then it would indicate that there is some problem and you will have to get it repaired.


Common Mistakes When Diagnosing the P012A Code


  • Inlet pressure sensor can start failure
  • There can be some failure in the powertrain control module
  • Issue of wiring can arise

Other Diagnostic Codes Related To OBD Code P012A

P012B - Turbocharger/Supercharger Inlet Pressure Sensor Circuit Range/Performance (Downstream of throttle valve)

P012C - Turbocharger/Supercharger Inlet Pressure Sensor Circuit Low (Downstream of throttle valve)

P012D - Turbocharger/Supercharger Inlet Pressure Sensor Circuit High (Downstream of throttle valve)

P012E - Turbocharger/Supercharger Inlet Pressure Sensor Circuit Intermittent/Erratic (Downstream of throttle valve)