Error Code P0236 is defined as Turbo Charger Boost Sensor A Range/Performance. This code applies to all turbocharged cars. Its difference in other makes is usually on the method by which the pressure is measured in the intake manifold.
It’s a generic trouble code, meaning it appears in all cars equipped with OBD-II, particularly those made since 1996 up to present. Specifications on the definition, troubleshooting and repairs of course, vary form one make and/or model to another.
For GM cars for example, it is defined as Turbocharger Boost System Performance.
For Dodge diesel pickups, it is described as MAP Sensor Too High Too Long.
Error Code P0236 is triggered when the PCM (powertrain control module, also called as ECM or engine control module) detects that the Intake Boost Pressure Sensor A input circuit range or performance is runs outside of its specifications as compared to MAP (manifold pressure sensor) or BARO (barometric pressure sensor) at idle, with key on, engine off, prior to starting.
The usual symptoms of this error code are:
There are multiple possible causes for this error code, but it always starts with a problem in the turbo boost pressure sensor. Some of possible causes include:
Other possible causes include:
As with other trouble codes, mechanics start their troubleshooting for this Error Code P236 by scanning and documenting the freeze frame data to verify the problem.
Then, the mechanic will clear the codes to check whether the error code comes back.
Then, they will check the operation of the boost pressure sensor and compare it to the MAP sensor.
After that, they will proceed on checking the turbo boost sensor and look for any signs of blocking on the sensor port, hose or lines.
Lastly, they will check the connector of the turbo boost sensor to see if there are any loose or corroded pins.
This is just the standard process most mechanics follow. To start the diagnosis, you should definitely consult with the TSB (technical service bulletin) of your particular 2012 Mitsubishi Eclipse spyder. This is a known problem, which means there are known fixes for it provided by the manufacturer, saving you time and money during diagnosis.
Replacing the defective boost sensor (the one that is not giving the correct input pressure reading to the PCM) usually fixes the problem. For defective hoses and connections of the turbo boost sensor of course, they should be repaired if not replaced, particularly those with blockage and kinks.
As said earlier, this error code causes lack of power on acceleration. This is because cars with only one sensor have their turbo boost disabled by the PCM, as the turbo boost sensor stays out of range or experiencing performance problems.