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Discussion Starter #1
Under gentle acceleration when starting to go up a gentle incline the engine goes into limp mode and Engine System Failure shows on the dash.
The fault code is P023D. Never happens when driving hard!
I have checked the two sensors on the top of the inlet manifold and both appear ok.
My car is L322 V8 diesel

Anyone any ideas?
 

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Fault code P023D is:it means that the powertrain control module (PCM) has detected a discrepancy in the correlating signals between the manifold absolute pressure (MAP) sensor and the turbocharger/supercharger boost sensor which has been designated "A".
The "A" denotes a specific boost sensor in a system which may use multiple boost sensors in different locations. Consult a reliable vehicle information source to determine precisely which sensor the A references (for the vehicle in question). This code is applicable only to vehicles that are equipped with forced air induction devices Forced air induction devices include turbochargers and superchargers. The MAP sensor provides the PCM with a voltage signal that reflects air density or pressure in the intake manifold. The voltage signal is received (by the PCM) as either kilopascal (kPa) units or inches of mercury (Hg). In Some vehicle applications, MAP is substituted for barometric pressure and measured in similar increments. The turbocharger/supercharger boost pressure sensor (designated A) will likely be of a similar design to the MAP sensor. It monitors air density (boost pressure) inside the turbocharger/supercharger intake pipe and provides the PCM with an appropriate voltage signal.
A code P023D will be stored, and a malfunction indicator lamp (MIL) may be illuminated, if the PCM detects voltage signals between the MAP sensor and the turbocharger/supercharger boost sensor A which differ by more than a programmed degree. Multiple ignition cycles (with a failure) may be required for MIL illumination.
Overall engine performance and fuel efficiency may be adversely affected by the conditions which contribute to a code P023D. It should be categorized as severe.

You might want to look at this thread on the forum - http://www.rangerovers.net/forum/6-range-rover-mark-iii-l322/282410-p023d-limp-mode.html
 

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Discussion Starter #3
Thank you for your help.
I have managed to sort the problem.
I swapped sensors on the top of the engine but that did nothing. removed the underwheel plastic arch liners and heat shields and lubricated the turbo actuators, still no result.
I then messed about with the intercooler hoses and noticed some air coming from the right hose when the engine was accelerating (3000 RPM) I moved the mesh sleeve and the split became more obvious.
I swapped both pipes and the problem disappeared!
 
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