Possible causes are listed in the order of what to check.
28 - DTC-Based Diagnostics / MODULE, Powertrain Control (PCM) / Diagnosis and Testing
P2262-00-TURBOCHARGER BOOST PRESSURE NOT DETECTED - MECHANICAL
Theory of Operation
When the accelerator is closed suddenly, excessive boost pressure can build up between the Turbocharger and the Throttle Body which can cause damage to the Turbocharger. This can occur because the compressed air created by the Turbocharger has no place to go. This results in compressor surge. The Powertrain Control Module (PCM) detects this pressure increase via input from the Boost Pressure Sensor. The Boost Pressure Sensor operates as a typical three wire sensor. The PCM provides a 5-volt supply and sensor return circuit to the Boost Pressure Sensor and receives a feedback voltage on the signal circuit. The Turbocharger Surge Valve is responsible for venting the boost pressure between the Turbocharger and Throttle Body during sudden deceleration. The Turbocharger Surge Valve is normally spring loaded closed. When the PCM receives an input signal from the Boost Pressure Sensor that the pressure is above a calibrated amount, the PCM grounds the Turbocharger Surge Valve Control circuit which electrically opens the valve and routes the excess pressure between the Turbocharger and the Throttle Body back to the inlet of the Turbocharger, relieving the pressure and preventing compressor surge.
When Monitored and Set Conditions
When Monitored: This diagnostic runs continuously when the following conditions are met:
•With the engine running.
•When the Wastegate Valve is commanded closed or is open at a value less than 100%.
Set Conditions:
•The difference between the Powertrain Control Module (PCM) (modeled position minus the actual position) is greater than 30 kPa (4.35 PSI).
Default Actions:
•The MIL light will illuminate.
Possible Causes
RESTRICTED AIR FILTER
BOOST SYSTEM PRESSURE HOSES RESTRICTED OR LEAKING
LARGE INTAKE SYSTEM LEAK OR RESTRICTION
INTERCOOLER LEAK
EXHAUST SYSTEM RESTRICTION
WASTEGATE SOLENOID
WASTEGATE VALVE STICKING OPEN
TURBOCHARGER (SEIZED TURBINE)