Some 2011-2012 Ford F-150 trucks equipped with the 3.5L gasoline turbocharged direct injection (GTDI) engine and built on or before 5/24/2012 may exhibit an intermittent MIL on with DTC P0234.
1. Is the vehicle built on or before 1/17/2012? If yes, proceed to Step 2. If not, proceed to Step 10.
2. Remove the engine appearance cover.
3. Remove the turbocharger vacuum regulator solenoid mounted on the right side of the upper intake manifold.
4. Remove the vacuum tee and vacuum supply hose connecting the turbocharger vacuum regulator solenoid to the upper intake manifold.
5. Disconnect the vacuum supply hose from the vacuum tee.
6. Ensure that the vacuum hose is clear of any internal contamination.
7. Trim any exposed plastic material flashing off of the vacuum tee using a razor blade.
8. Install the vacuum tee and vacuum supply hose.
9. Install a new turbocharger vacuum regulator solenoid.
10. Reprogram the PCM to the latest calibration using IDS release 83.01 or higher.