Here is the shop manual description of the code P2262.
|2005 PCED On Board Diagnostics 6.0L Diesel||SECTION 5: Pinpoint Tests|
|Procedure revision date: 11/20/2009|
The variable geometry turbocharger (VGT) is controlled by the powertrain control module (PCM). The PCM uses an exhaust pressure (EP) sensor to monitor the pressure and adjust the VGT solenoid duty cycle. The VGT solenoid receives a pulse width modulated (PWM) signal from the PCM that controls the solenoid on/off time. The VGT solenoid directs oil to a piston within the actuator housing. The direction of oil flow to the piston increases or decreases the exhaust pressure.
The VGT solenoid control is based on input sensors. The input sensors are used to calculate the engine speed, desired fuel quantity, altitude, and exhaust pressure. The amount of voltage the sensor deviates from a calculated reference value (sensor bias) may cause a commanded versus actual pressure calculation error.
The PCM monitors the exhaust pressure. A DTC is set when the difference between the commanded and the actual exhaust pressure is not within the calibrated limits.
NOTICE: The PCM harness connectors must be properly seated and the connector latch properly attached to eliminate possible driveability concerns or a no-start condition. Installing PCM connectors on an angle may cause an improper connection, misdiagnosis, and damaged components. Install the connector until the lever pivots and seats itself. Apply light pressure to get the connector into position on the PCM and then fully seat the connector.
Note: Visually inspect the harness connectors for corrosion, damage, proper mating, and correct pin tension.
- P0299 = Turbo/Super Charger Underboost
- P0478 = Exhaust Pressure Control Valve High Input
- P2262 = Turbo/Super Charger Boost Pressure Not Detected
- P2263 = Turbo/Super Charger System Boost Performance
Below is link for the pin point test for the code.
Reading through the test for the code looks like it is a bad EGR valve. It all depends on what your scan tool can do to find out if it is. The EGR valve may look good and move manually, but it can also fail electrically. If you scan tool alows you to operate the EGR valve with it, see if you can electrically open it and close it. The engine will quiet down and almost sound like a car engine. It will not sound like a diesel. Also if your engine is running quiet, and you have no boost and the code P2262, it looks like the EGR valve.