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Can be as simple as a filty air cleaner, or even an aftermarket one. Or as bad as a defective turbo, been complaints about that waste gate valve linkage, even the sensor itself. Need to take pressure tests.

Ha, sometimes I wish I kept my 30 Olds, never had these kinds of problems, but still got me there.

DTC P0236
Circuit Description

The boost pressure sensor is integrated with the turbocharger boost/intake air temperature sensor. The boost pressure sensor measures the range of pressures between the turbocharger and the throttle body. The sensor used on this engine is a three atmosphere sensor. Pressure in this portion of the induction system is affected by engine speed, throttle opening, turbocharger boost pressure, Intake air temperature (IAT), barometric pressure (BARO), and the efficiency of the charge air cooler.

The sensor provides a signal voltage to the engine control module (ECM), relative to the pressure changes. Under normal operation the greatest pressure that can exist in this portion of the induction system at ignition ON, engine OFF is equal to the BARO. When the engine is operated at wide-open throttle (WOT) the turbocharger can increase the pressure to near 240 kPa (34.8 psi). The pressure is equal to the BARO when the engine is idling or decelerating.

Conditions for Running the DTC



  • DTC P0096, P0097, P0098, P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0116, P0117, P0118, P0119, P0128, P0237, P0238, P0335, P0336, P2227, P2228, P2229, or P2230 is not active.
  • Engine speed is between 400-7,000 RPM.
  • Engine Coolant Temperature (ECT) is between -7 to +125°C (19.4-257°F).
  • Intake Air Temperature (IAT) is between -20 to +125°C (-4 to +257°F).
  • The DTC runs continuously when the above conditions have been met.
OR



  • DTC P0106, P0107, P0108, P0237, P0238, P2227, P2228, P2229, P2230, or P2610 s not active.
  • DTC P0107, P0108, P0237, P0238, P2228, or P2229 is not pending.
  • Ignition is ON.
  • Engine is OFF
  • The time between current ignition cycle and the last time the engine was running is greater than 6 s.
  • The DTC runs continuously when the above conditions have been met.
Conditions for Setting the DTC



  • The ECM detects that various combinations of Turbocharger Intake Flow Rationality Diagnostic Failure models, derived from engine speed, the BARO sensor, the MAF sensor, the MAP sensor, the throttle position sensor and the turbocharger boost pressure sensor have failed when the engine is running.
OR



  • The ECM detects that the boost pressure sensor signal is less than 50 kPa (7.3 psi) or greater than 115 kPa (16.7 psi) when the ignition is ON and the engine is NOT rotating.
Action Taken When the DTC Sets



  • DTC P0236 is a Type B DTC.
  • The ECM will disable boost control and limit the system to mechanical boost only, resulting in a substantial decrease in engine power.
Conditions for Clearing the MIL/DTC

DTC P0236 is a Type B DTC.

Diagnostic Aids



  • The charge air cooler is connected to the turbocharger and to the throttle body by flexible duct work that requires the use of special high torque fastening clamps. These clamps cannot be substituted. In order to prevent any type of air leak when servicing the duct work, the tightening specifications and proper positioning of the clamps is critical, and must be strictly adhered to.
  • Use a smoke generating device or a solution of dish soap and water in a spray bottle to pinpoint any suspected air leaks in the induction system and in the charge air cooler assembly.
Reference Information

Schematic Reference
Engine Controls Schematics See: Powertrain Management\Diagrams\Electrical

Connector End View Reference
Component Connector End Views See: Diagrams\Connector Views

Description and Operation
Turbocharger System Description See: Powertrain Management\Fuel Delivery and Air Induction\Turbocharger\Description and Operation

Electrical Information Reference


DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions See: Diagnostic Trouble Code Descriptions

Scan Tool Reference
Control Module References for scan tool information See: Testing and Inspection\Programming and Relearning

Circuit/System Verification



  1. Verify that DTC P0641 is not set.
=>If the DTC is set
Refer to DTC P0641, P0651, P0697, or P06A3.



  • If the DTC is not set

  1. If you were sent here from DTC P0068, P0101, P0106, P0121, or P1101, refer to Circuit/System Testing.
  2. Ignition ON.
  3. Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90%.
=>90% or greater
Refer to Throttle Body Inspection and Cleaning.



  • If less than 90%

  1. Verify the scan tool Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool.
 

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Discussion Starter #3
Starting to not like this car should have kept my srt do you think that if i buy the tune would it pass does 6psi
 

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Administrator, Resident Tater Salad
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An aftermarket tune won't solve this. You need to do some investigating.

Check all turbo air pipes, particularly those connecting to the intercooler. They have been known to blow off.

Check vacuum lines to the turbo control valve and wastegate.

Check wiring to the MAP sensor. If all that checks out, it might well be a MAP sensor gone bad. My bet would be on a loose hose though.
 
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